ICC(1) Intel(R) C++ Compiler Options ICC(1) NAME icc - invokes the Intel(R) C++ compiler SYNOPSIS icc [ options ] file1 [ file2 ...] where: options represents zero or more compiler options. filen is a C/C++ source (.C .c .cc .cp .cpp .cxx .c++ .i), assembly (.s), object (.o), static library (.a), or other linkable file. Note: The icpc command uses the same compiler options as the icc com- mand. Invoking the compiler using icpc compiles .c, and .i files as C++. Invoking the compiler using icc compiles .c and .i files as C. Using icpc always links in C++ libraries. Using icc only links in C++ libraries if C++ source is provided on the command line. DESCRIPTION The Intel(R) C++ Compiler is designed to process C and C++ programs on Intel architecture based systems. You can preprocess, compile, assem- ble, and link these programs. This document explains how information and instructions apply differ- ently to IA-32 applications, Intel(R) EM64T applications, and Ita- nium(R) architecture-based applications. If a description does not explicitly state a specific architecture, it is applicable to all. See the Intel C++ Compiler user documentation for more complete information than is presented here. Most language features are available on all supported systems. How- ever, some language features are only available on certain processors or a certain operating system. Such language features are labeled within parenthses as follows: i32 Means the feature is available on IA-32-based systems. i32em Means the feature is available on IA-32-based systems with Intel(R) Extended Memory 64 Technology (Intel(R) EM64T). i64 Means the feature is available on Itanium(R)-based systems. L*X Means the feature is available on Linux* systems. M*X32 Means the feature is available on Intel(R)-based systems running Mac OS*. If a labeled feature is only available on certain processors or operat- ing systems, you will see the word ( only) within the label along with the appropriate abbreviation(s). If a labeled feature is not available on a certain processor or operating system, you will see the words (not on ) within the label along with the appropriate abbreviation. If no label appears, the feature is available on all supported systems. gcc* Interoperability C++ compilers are interoperable if they can link object files and libraries generated by one compiler with object files and libraries generated by the second compiler, and the resulting executable runs successfully. The Intel(R) C++ Compiler options that affect gcc* interoperability include: · -cxxlib- · -gcc-name · -gcc-version · -fabi-version · -no-gcc (see gcc Predefined Macros for more information) · -[no-]gcc-extern-inline In the 9.1 compiler, there is improved compatibility with gcc regarding the behavior of extern inline functions. Previously, by default, the C99 standard was followed by always creating a body for extern inline functions. In 9.1, by default, no body is created unless the function cannot be inlined for some reason (for example, its address might be taken). If the C99 behavior, rather than the now default gcc behavior is desired, use the -no-gcc-extern-inline option. The Intel(R) C++ Compiler is interoperable with GNU gcc* compiler ver- sions greater than or equal to 3.2. See the Intel C++ Compiler User's Guide for more information. OPTION SUMMARIES Option Alphabetic Summary All of the Intel C++ Compiler options are listed alphabetically in this section. After each listing is a reference to the Functional area where a detailed description of the option appears. -A- see Preprocessor Options -A[] see Preprocessor Options -[no-]alias-args see Advanced Performance Options -[no]align see Language Options -ansi see Language Options -[no-]ansi-alias see Advanced Performance Options -auto-ilp32 see Advanced Performance Options -ax{K|W|N|B|P|T} see Performance Options, Optimization Levels, Automatic Processor-specific Optimization, Vectorization Options -B see Miscellaneous Options -c see Output, Debug, and PCH Options -C see Preprocessor Options -[no-]c99 see Language Options -[no-]clomp-sharable-info see Advanced Performance Options, Paralleliza- tion with OpenMP* -[no-]clomp-sharable-propagation see Advanced Performance Options, Paralleliza- tion with OpenMP* -[no-]cluster-openmp-profile see Advanced Performance Options, Paralleliza- tion with OpenMP* -[no-]cluster-openmp see Advanced Performance Options, Paralleliza- tion with OpenMP* -[no-]complex-limited-range see Advanced Performance Options -create-pch see Output, Debug, and PCH Options; Precom- piled Headers -cxxlib- see Linking or Linker Options -D[=] see Preprocessor Options -[no-]debug [keyword] see Output, Debug, and PCH Options -dD see Preprocessor Options -dM see Preprocessor Options -dN see Preprocessor Options -dryrun see Miscellaneous Options -dumpversion see Miscellaneous Options -dynamic-linker see Linking or Linker Options -dynamiclib see Linking or Linker Options -E see Preprocessor Options -EP see Preprocessor Options -export see Language Options -export-dir see Language Options -F see Mac OS Options -fabi-version= see Miscellaneous Options -f[no-]alias see Performance Options -fargument-[no-]alias see Advanced Performance Options -fargument-noalias-global see Advanced Performance Options -fast see Performance Options, Optimization Levels -fcode-asm see Output, Debug, and PCH Options -f[no-]common see Miscellaneous Options -fdata-sections see Performance Options -f[no-]exceptions see Performance Options -f[no-]fnalias see Performance Options -ffunction-sections see Performance Options -f[no-]inline see Performance Options -f[no-]inline-functions see Performance Options -finline-limit= see Performance Options -f[no-]math-errno see Miscellaneous Options -fminshared see Miscellaneous Options -fno-builtin see Miscellaneous Options -fno-builtin- see Performance Options, Miscellaneous Options -fno-gnu-keywords see Language Options -fno-implicit-inline-templates see Language Options -fno-implicit-templates see Language Options -f[no-]omit-frame-pointer see Performance Options -f[no-]non-lvalue-assign see Language Options -fno-operator-names see Language Options -[no-]fnsplit see Advanced Performance Options -fp see Performance Options -fpack-struct see Miscellaneous Options -fpascal-strings see Mac OS Options -fpermissive see Language Options -f[no-]pic see Miscellaneous Options -f[no-]PIC see Miscellaneous Options -fp-model see Advanced Performance Options -[no-]fp-port see Performance Options -fpstkchk see Performance Options -fr32 see Miscellaneous Options -f[no-]rtti see Language Options -freg-struct-return see Miscellaneous Options -fshort-enums see Language Options -fsource-asm see Output, Debug, and PCH Options -fstack-security-check see Miscellaneous Options -fsyntax-only see Language Options -ftemplate-depth- see Language Options -ftls-model= see Advanced Performance Options -ftrapuv see Output, Debug, and PCH Options -[no-]ftz see Advanced Performance Options -funroll-loops see Advanced Performance Options -funsigned-bitfields see Language Options -funsigned-char see Language Options -f[no]verbose-asm see Output, Debug, and PCH Options -fvisibility=[extern|default|protected|hidden|internal] see Miscellaneous Options -fvisibility-default= see Miscellaneous Options -fvisibility-extern= see Miscellaneous Options -fvisibility-hidden= see Miscellaneous Options -fvisibility-inlines-hidden see Miscellaneous Options -fvisibility-internal= see Miscellaneous Options -fvisibility-protected= see Miscellaneous Options -g see Output, Debug, and PCH Options -g0 see Output, Debug, and PCH Options -[no-]gcc-extern-inline see Miscellaneous Options -gcc-name= see Miscellaneous Options -gcc-version= see Miscellaneous Options -[no-]global-hoist see Miscellaneous Options -H see Preprocessor Options -help see Miscellaneous Options -I see Preprocessor Options -idirafter see Preprocessor Options -i-dynamic see Linking or Linker Options -imacros see Preprocessor Options -inline-debug-info see Output, Debug, and PCH Options -inline-factor see Advanced Performance Options -inline-forceinline see Advanced Performance Options -inline-max-per-compile see Advanced Performance Options -inline-max-per-routine see Advanced Performance Options -inline-max-size see Advanced Performance Options -inline-max-total-size see Advanced Performance Options -inline-min-size see Advanced Performance Options -ip see Advanced Performance Options, Interproce- dural Optimizations (IPO) -[no-]IPF-fltacc see Advanced Performance Options -IPF-flt-eval-method0 see Advanced Performance Options -[no-]IPF-fma see Advanced Performance Options -[no-]IPF-fp-relaxed see Advanced Performance Options -IPF-fp-speculation{fast|safe|strict|off} see Advanced Performance Options -ip-no-inlining see Advanced Performance Options -ip-no-pinlining see Advanced Performance Options -ipo[value] see Advanced Performance Options, Interproce- dural Optimizations (IPO) -ipo-c see Advanced Performance Options, Interproce- dural Optimizations (IPO) -ipo-S see Advanced Performance Options, Interproce- dural Optimizations (IPO) -ipo-separate see Advanced Performance Options, Interproce- dural Optimizations (IPO) -iprefix see Preprocessor Options -iquote see Preprocessor Options -i-static see Linking or Linker Options -isystem see Preprocessor Options -ivdep-parallel see Advanced Performance Options -iwithprefix see Preprocessor Options -iwithprefixbefore see Preprocessor Options -Kc++ see Language Options -kernel see Miscellaneous Options -l see Linking or Linker Options -L see Linking or Linker Options -long_double see Miscellaneous Options -M see Preprocessor Options -malign-double see Language Options -malign-mac68k see Mac OS Options -malign-natural see Mac OS Options -malign-power see Mac OS Options -map-opts see Output, Debug, and PCH Options -march={pentiumpro | pentiumii | pentiumiii | pentium2 | pen- tium3 | pentium4} see Performance Options -mcmodel= see Linking or Linker Options -mcpu= see Performance Options -MD see Preprocessor Options -mdynamic-no-pic see Mac OS Options -MF see Preprocessor Options -mfixed-range=f12-f15,f32-f127 see Miscellaneous Options -MG see Preprocessor Options -m[no-]ieee-fp see Performance Options -MM see Preprocessor Options -MMD see Preprocessor Options -mno-serialize-volatile see Advanced Performance Options -mp see Performance Options -MP see Preprocessor Options -mp1 see Performance Options -MQ see Preprocessor Options -m[no-]relax see Linking or Linker Options -mserialize-volatile see Advanced Performance Options -msse see Performance Options -msse2 see Performance Options -msse3 see Performance Options -MT see Preprocessor Options -mtune= see Performance Options -[no-]multibyte-chars see Miscellaneous Options -nobss-init see Miscellaneous Options -no-cpprt see Linking or Linker Options -nodefaultlibs see Linking or Linker Options -no-gcc see Preprocessor Options -nostartfiles see Linking or Linker Options -nostdinc see Preprocessor Options -nostdlib see Linking or Linker Options -o see Output, Debug, and PCH Options -O see Performance Options -O0 see Performance Options, Optimization Levels -O1 see Performance Options, Optimization Levels -O2 see Performance Options, Optimization Levels -O3 see Performance Options, Optimization Levels -Ob see Performance Options -openmp see Advanced Performance Options, Paralleliza- tion with OpenMP* -openmp-profile see Advanced Performance Options, Paralleliza- tion with OpenMP* -openmp-report{0|1|2} see Advanced Performance Options, Paralleliza- tion with OpenMP* -openmp-stubs see Advanced Performance Options, Paralleliza- tion with OpenMP* -opt-mem-bandwidth see Advanced Performance Options -opt-report see Advanced Performance Options -opt-report-file see Advanced Performance Options -opt-report-help see Advanced Performance Options -opt-report-level[{min|med|max}] see Advanced Performance Options -opt-report-phase{ipo|hlo|ilo|ecg|omp|all} see Advanced Performance Options, Paralleliza- tion with OpenMP* -opt-report-routine see Advanced Performance Options -Os see Performance Options -p see Advanced Performance Options -P see Preprocessor Options -parallel see Advanced Performance Options, Auto Paral- lelization Options -par-report{0|1|2|3} see Advanced Performance Options, Auto Paral- lelization Options -par-threshold[] see Advanced Performance Options, Auto Paral- lelization Options -pc{32|64|80} see Performance Options -pch see Output, Debug, and PCH Options; Precom- piled Headers -pch-dir see Output, Debug, and PCH Options; Precom- piled Headers -[no-]prec-div see Performance Options -[no-]prec-sqrt see Performance Options -[no-]prefetch see Advanced Performance Options -print-multi-lib see Output, Debug, and PCH Options -prof-dir see Advanced Performance Options, Pro- file-guided Optimizations (PGO) -prof-file see Advanced Performance Options, Pro- file-guided Optimizations (PGO) -prof-gen[x] see Advanced Performance Options, Pro- file-guided Optimizations (PGO) -prof-gen-sampling see Advanced Performance Options, Pro- file-guided Optimizations (PGO) -prof-use see Advanced Performance Options, Pro- file-guided Optimizations (PGO) -Qinstall see Component Control Options -Qlocation,, see Component Control Options -Qoption,, see Component Control Options -qp see Advanced Performance Options -rcd see Performance Options -reserve-kernel-regs see Miscellaneous Options -[no]restrict see Language Options -S see Output, Debug, and PCH Options -shared see Linking or Linker Options -shared-libcxa see Linking or Linker Options -[no-]sox see Miscellaneous Options -ssp see Advanced Performance Options -static see Linking or Linker Options -static-libcxa see Linking or Linker Options -std=c99 see Language Options -strict-ansi see Language Options -T see Linking or Linker Options -tcheck see Advanced Performance Options -[no]traceback see Compiler Diagnostics Options -u see Linking or Linker Options -U see Preprocessor Options -unroll see Advanced Performance Options -unroll0 see Advanced Performance Options -use-asm see Output, Debug, and PCH Options -use-msasm see Output, Debug, and PCH Options -use-pch see Output, Debug, and PCH Options; Precom- piled Headers -V see Miscellaneous Options -v see Miscellaneous Options -vec-report[{0|1|2|3|4|5}] see Advanced Performance Options --version see Miscellaneous Options -w see Compiler Diagnostics Options -w see Compiler Diagnostics Options -Wa[,,...] see Linking or Linker Options -W[no-]abi see Compiler Diagnostics Options -Wall see Compiler Diagnostics Options -Wbrief see Compiler Diagnostics Options -Wcheck see Compiler Diagnostics Options -W[no-]comment[s] see Compiler Diagnostics Options -Wcontext-limit= see Compiler Diagnostics Options -wd[,,...] see Compiler Diagnostics Options -W[no-]deprecated see Compiler Diagnostics Options -we[,,...] see Compiler Diagnostics Options -Werror see Compiler Diagnostics Options -Winline see Compiler Diagnostics Options -Wl,[,,...] see Linking or Linker Options -W[no-]main see Compiler Diagnostics Options -W[no-]missing-prototypes see Compiler Diagnostics Options -wn see Compiler Diagnostics Options -Wp64 see Compiler Diagnostics Options -Wp,[,,...] see Linking or Linker Options, Precompiled Headers -W[no-]pointer-arith see Compiler Diagnostics Options -wr[,,...] see Compiler Diagnostics Options -W[no-]return-type see Compiler Diagnostics Options -W[no-]shadow see Compiler Diagnostics Options -W[no-]uninitialized see Compiler Diagnostics Options -W[no-]unknown-pragmas see Compiler Diagnostics Options -W[no-]unused-function see Compiler Diagnostics Options -ww[,,...] see Compiler Diagnostics Options -X see Preprocessor Options -x see Miscellaneous Options -x{K|W|N|B|P|T} see Performance Options, Optimization Levels, Optimizing Exclusively for Specific Proces- sors, Vectorization Options -Xlinker see Linking or Linker Options -Zp[n] see Language Options Option Functional Summary All the options listed in the following summary are described in more detail in the sections that follow. Performance Options -ax{K|W|N|B|P|T} -f[no-]alias -fast -fdata-sections -f[no-]exceptions -f[no-]fnalias -ffunction-sections -f[no-]inline -f[no-]inline-functions -finline-limit= -fno-builtin- -f[no-]omit-frame-pointer -fp -[no-]fp-port -fpstkchk -march={pentiumpro | pentiumii | pentiumiii | pentium2 | pentium3 | pentium4} -mcpu= -m[no-]ieee-fp -mp -mp1 -msse -msse2 -msse3 -mtune= -O -O0 -O1 -O2 -O3 -Ob -Os -pc{32|64|80} -[no-]prec-div -[no-]prec-sqrt -rcd -x{K|W|N|B|P|T} Advanced Performance Options -[no-]alias-args -[no-]ansi-alias -auto-ilp32 -[no-]clomp-sharable-info -[no-]clomp-sharable-propaga- tion -[no-]cluster-openmp-profile -[no-]cluster-openmp -[no-]complex-limited-range -fargument[no-]-alias -far- gument-noalias-global -[no-]fnsplit -fp-model -ftls-model= -[no-]ftz -funroll-loops -inline-factor -inline-forceinline -inline-max-per-com- pile -inline-max-per-routine -inline-max-size -inline-max-total-size -inline-min-size -ip -[no-]IPF-fltacc -IPF-flt-eval-method0 -[no-]IPF-fma -[no-]IPF-fp-relaxed -IPF-fp-specula- tion{fast|safe|strict|off} -ip-no-inlining -ip-no-pin- lining -ipo[value] -ipo-c -ipo-S -ipo-separate -ivdep-parallel -mno-serialize-volatile -mserial- ize-volatile -openmp -openmp-profile -openmp-report{0|1|2} -openmp-stubs -opt-mem-band- width -opt-report -opt-report-file -opt-report-help -opt-report-level[{min|med|max}] -opt-report-phaseipo|hlo|ilo|ecg|omp|all -opt-report-rou- tine -p -parallel -par-report{0|1|2|3} -par-threshold[] -[no-]prefetch -prof-dir -prof-file -prof-gen[x] -prof-gen-sampling -prof-use -qp -ssp -tcheck -unroll -unroll0 -vec-report[{0|1|2|3|4|5}] Output, Debug, and PCH Options -c -create-pch -[no-]debug[keyword] -fcode-asm -fsource-asm -ftrapuv -f[no]verbose-asm -g -g0 -inline-debug-info -map-opts -o -pch -pch-dir -print-multi-lib -S -use-asm -use-msasm -use-pch Preprocessor Options -A- -A[] -C -D[=] -dD -dM -dN -E -EP -H -I -idirafter -imacros -iprefix -iquote -isys- tem -iwithprefix -iwithprefixbefore -M -MD -MF -MG -MM -MMD -MP -MQ -MT -no-gcc -nostdinc -P -U -X Component Control Options -Qinstall -Qlocation,, -Qop- tion,, Language Options -[no]align -ansi -[no-]c99 -export -export-dir -fno-gnu-keywords -fno-implicit-inline-templates -fno-implicit-templates -f[no-]non-lvalue-assign -fno-operator-names -fpermissive -f[no-]rtti -fshort-enums -fsyntax-only -ftemplate-depth- -fun- signed-bitfields -funsigned-char -Kc++ -malign-double -[no]restrict -std=c99 -strict-ansi -Zp[n] Compiler Diagnostics Options -[no]traceback -w -w -W[no-]abi -Wall -Wbrief -Wcheck -W[no-]comment[s] -Wcontext-limit= -wd[,,...] -W[no-]deprecated -we[,,...] -Werror -Winline -W[no-]main -W[no-]missing-prototypes -wn -Wp64 -W[no-]pointer-arith -wr[,,...] -W[no-]return-type -W[no-]shadow -W[no-]uninitialized -W[no-]unknown-pragmas -W[no-]unused-function -ww[,,...] Miscellaneous Options -B -dryrun -dumpversion -fabi-version= -f[no-]common -f[no-]math-errno -fminshared -fno-builtin -fno-builtin- -fpack-struct -f[no-]pic -f[no-]PIC -fr32 -freg-struct-return -fstack-security-check -fvisibility=[extern | default | protected | hidden | internal] -fvisibil- ity-default= -fvisibility-extern= -fvisibil- ity-hidden= -fvisibility-inlines-hidden -fvisibil- ity-internal= -fvisibility-protected= -[no-]gcc-extern-inline -gcc-name= -gcc-ver- sion= -[no-]global-hoist -help -kernel -long_dou- ble -mfixed-range=f12-f15,f32-f127 -[no-]multi- byte-chars -nobss-init -reserve-kernel-regs -[no-]sox -V -v --version -x Linking or Linker Options -cxxlib- -dynamic-linker -dynamiclib -i-dynamic -i-static -L -l -mcmodel -m[no-]relax -no-cpprt -nodefault- libs -nostartfiles -nostdlib -shared -shared-libcxa -static -static-libcxa -T -u -Wa[,,...] -Wl,[,,...] -Wp,[,,...] -Xlinker Mac OS Options -F -fpascal-strings -malign-mac68k -malign-natu- ral -malign-power -mdynamic-no-pic OPTION DESCRIPTIONS Performance Options The performance options act using general criteria to optimize code. The optimizations listed in this section are available for Intel architectures or are compatible with gcc compiler options. -ax (i32, i32em only) Generates code for Intel(R) Core(TM) Duo processors, Intel(R) Core(TM) Solo processors, Intel(R) Pentium(R) 4 processors with Streaming SIMD Extensions 3, and compati- ble Intel processors with Streaming SIMD Extensions 3. Generate code specialized for processor extensions speci- fied by while also generating generic IA-32 code. includes one or more of the following characters: K -- Intel Pentium III processors and compatible Intel processors W -- Intel Pentium 4 processors and compatible Intel pro- cessors N -- Intel Pentium 4 processors and compatible Intel pro- cessors. Enables new optimizations in addition to Intel processor-specific optimizations. B -- Intel Pentium M processors and compatible Intel pro- cessors. Enables new optimizations in addition to Intel processor-specific optimizations. P -- Intel(R) Core(TM) Duo, Intel(R) Core Solo(TM), and Intel(R) Pentium(R) 4 Processors with Streaming SIMD Extensions 3 (SSE3) instruction support. Enables new optimizations in addition to Intel processor-specific optimizations. T -- Intel(R) Core(TM)2 Duo, Intel(R) Core(TM)2 Extreme, and the Dual-Core Intel(R) Xeon(R) processor 5100 series. Note: The only -ax options available on Intel(R) EM64T-based systems are -axW, -axP, and -axT. Note: On M*X32 systems, P is the only valid processor value. On these systems, -axP is equivalent to -xP, which is the default and is always set. -f[no-]alias Assume [do not assume] aliasing in the program (DEFAULT = -falias). -fast The -fast option maximizes speed across the entire pro- gram. It sets command options that can improve run-time performance, as follows: i32, i32em: The -fast option turns on -O3, -ipo, -static, -no-prec-div, and -xP. IA-32 programs compiled with -fast will execute only on Intel(R) Pentium(R) 4 proces- sors with Streaming SIMD Extensions 3 (SSE3). Programs compiled with this option will detect non-compatible processors and generate an error message during execu- tion. i64: The -fast option turns on -O3, -ipo, and -static. M*X32: The -fast option turns on -O3, -ipo, -mdy- namic-no-pic, and -no-prec-div. -fdata-sections Separate functions for the linker (COMDAT). Same as -ffunction-sections. -f[no-]exceptions The -f[no-]exceptions option turns off exception handling table generation, resulting in smaller code. Any use of exception handling constructs - try blocks, throw state- ments will produce an error. Exception specifications are parsed but ignored. A preprocessor symbol __EXCEPTIONS is defined when this option is not used. It is undefined when this option is present. -f[no-]fnalias Assume [do not assume, but assume aliasing across calls] aliasing within functions (DEFAULT = -ffnalias). -ffunction-sections Separate functions for the linker (COMDAT). Same as -fdata-sections. -f[no-]inline Enables [disables] inlining of functions declared with the __inline keyword. Also enables inlining according to the C++ language. Same as -Ob1. -f[no-]inline-functions Inline [do not inline] certain interprocedural optimiza- tions for single file compilation. These optimizations are a subset of full intra-file interprocedural optimiza- tions. Enables [does not enable] the compiler to perform inline function expansion for calls to functions defined within the current source file -finline-limit= Lets you specify the maximum size of a function to be inlined. -fno-builtin- Disable the intrinsic. -f[no-]omit-frame-pointer (i32, i32em only) The negative version is the same as -fp. -fp (i32, i32em only) Disable using EBP as general purpose register. -[no-]fp-port (i32, i32em only) Round floating-point results at assignments and casts (some speed impact). -fpstkchk (i32, i32em only) Generate extra code after every function call to assure that the FP stack is in the expected state. Generally, when the FP stack overflows, a NaN value is put into FP calculations, and the program's results differ. Unfortu- nately, the overflow point can be far away from the point of the actual bug. The -fpstkchk option places code that would access violate immediately after an incorrect call occurred, thus making it easier to locate these issues. -march= (i32, i32em only) Generate code exclusively for a given cpu, where is one of the following: pentiumpro -- Intel Pentium Pro processors pentiumii -- Intel Pentium II processors pentiumiii -- Intel Pentium III processors pentium2 -- Intel Pentium II processors pentium3 -- Intel Pentium III processors pentium4 -- Intel Pentium 4 processors -mcpu= Optimize for a specific cpu, where is one of the following: pentium -- (i32 only) Optimize for Intel Pentium proces- sor. pentiumpro -- (i32 only) Optimize for Intel Pentium Pro, Intel Pentium II and Intel Pentium III processors. pentium4 -- (i32 only; DEFAULT on IA-32) Optimize for Intel Pentium 4 processors. itanium -- (i64 only) Optimize for Intel Itanium proces- sor itanium2 -- (i64 only) Optimize for Intel Itanium 2 pro- cessor. itanium2-9000 -- (i64, L*X only) Optimize for Dual-Core Intel(R) Itanium(R) 2 Processor 9000 Sequence processors. -m[no-]ieee-fp Same as -mp. -mp Maintain floating-point precision (disables some opti- mizations). The -mp option restricts optimization to maintain declared precision and to ensure that float- ing-point arithmetic conforms more closely to the ANSI and IEEE standards. For most programs, specifying this option adversely affects performance. If you are not sure whether your application needs this option, try compiling and running your program both with and without it to evaluate the effects on both performance and precision. -mp1 Improve floating-point precision. -mp1 disables fewer optimizations and has less impact on performance than -mp. -msse (i32 only) Generate code for Intel Pentium III and compatible Intel processors. -msse2 (i32 only) Generate code for Intel Pentium 4 and compatible Intel processors. -msse3 (i32, i32em only) Generate code for Intel Pentium 4 processors with SSE3 extensions. -mtune= Optimize for a specific cpu, where is one of the following: pentium -- (i32 only) Optimize for Intel Pentium proces- sor. pentiumpro -- (i32 only) Optimize for Intel Pentium Pro, Intel Pentium II and Intel Pentium III processors. pentium4 -- (i32 only; DEFAULT on IA-32) Optimize for Intel Pentium 4 processors. itanium -- (i64 only) Optimize for Intel Itanium proces- sor itanium2 -- (i64 only) Optimize for Intel Itanium 2 pro- cessor. itanium2-9000 -- (i64, L*X only) Optimize for Dual-Core Intel(R) Itanium(R) 2 Processor 9000 Sequence processors. -O0 Disable optimizations. -O Same as -O2 -O1 Optimize to favor code size and code locality. Disables loop unrolling. -O1 may improve performance for applica- tions with very large code size, many branches, and exe- cution time not dominated by code within loops. In most cases, -O2 is recommended over -O1. i32: Disable intrinsics inlining to reduce code size. i64: Disable software pipelining and global code schedul- ing. -O2 (DEFAULT) Optimize for code speed. This is the generally recom- mended optimization level. i64: Turn software pipelining ON. -O3 Enable -O2 optimizations and in addition, enable more aggressive optimizations such as loop and memory access transformation, and prefetching. The -O3 option opti- mizes for maximum speed, but may not improve performance for some programs. The -O3 optimizations may slow down code in some cases compared to -O2 optimizations. Recom- mended for applications that have loops with heavy use of floating point calculations and process large data sets. Turn on high-level optimizations. Enable -O2 plus more aggressive optimizations, such as loop transformation. i32, i32em: In conjunction with -ax{K|W|N|B|P|T} and -x{K|W|N|B|P|T} options, this option causes the compiler to perform more aggressive data dependency analysis than for -O2. This may result in longer compilation times. -Ob Control inline expansion, where is one of the follow- ing values: 0 -- Disables inlining. 1 -- (DEFAULT) Enables inlining of functions declared with the __inline keyword. Also enables inlining accord- ing to the C++ language. 2 -- Inlines any function, at the compiler's discretion. Enables interprocedural optimizations and has the same effect as -ip. -Os Enable speed optimizations, but disable some optimiza- tions that increase code size for small speed benefit. -pc (i32, i32em only) Enable floating-point significand precision control. Some floating-point algorithms are sensitive to the accuracy of the significand, or fractional part of the float- ing-point value. For example, iterative operations like division and finding the square root can run faster if you lower the precision with the -pc option. Set to one of the following values to round the significand to the indicated number of bits: 32: 24 bits (single precision) -- Caution: A change of the default precision control or rounding mode (for exam- ple, by using the -pc32 flag or by user intervention) may affect the results returned by some of the mathematical functions. 64: 53 bits (double precision) 80: 64 bits (extended precision) -- DEFAULT -[no-]prec-div (i32, i32em only) Improve precision of floating-point divides (some speed impact). With some optimizations the Intel C++ Compiler changes floating-point division computations into multi- plication by the reciprocal of the denominator. For exam- ple, A/B is computed as A x (1/B) to improve the speed of the computation. However, for values of B greater than 2126, the value of 1/B is "flushed" (changed) to 0. When it is important to maintain the value of 1/B, use -no-prec-div to disable the floating-point divi- sion-to-multiplication optimization. The result of -no-prec-div is more accurate, with some loss of perfor- mance. -[no-]prec-sqrt (i32, i32em only) Determine if certain square root optimizations are enabled. -rcd (i32, i32em only) Enable fast float-to-int conversions. The Intel compiler uses the -rcd option to improve the performance of code that requires floating-point-to-integer conversions. The system default floating point rounding mode is round-to-nearest. However, the C language requires float- ing point values to be truncated when a conversion to an integer is involved. To do this, the compiler must change the rounding mode to truncation before each float- ing-point-to-integer conversion and change it back after- wards. The -rcd option disables the change to truncation of the rounding mode for all floating point calculations, including floating point-to-integer conversions. Turning on this option can improve performance, but floating point conversions to integer will not conform to C seman- tics. -x (i32, i32em only) (not on M*X32) Generates code for Intel(R) Core(TM) Duo processors, Intel(R) Core(TM) Solo processors, Intel(R) Pentium(R) 4 processors with Streaming SIMD Extensions 3, and compati- ble Intel processors with Streaming SIMD Extensions 3. Generate specialized code to run exclusively on proces- sors supporting the extensions indicated by . includes one or more of the following characters: K -- Intel Pentium III processors and compatible Intel processors W -- Intel Pentium 4 processors and compatible Intel pro- cessors. Default for Intel(R) EM64T-based systems. N -- Intel Pentium 4 processors and compatible Intel pro- cessors with Streaming SIMD Extensions 2 (SSE2) instruc- tion support. Enables new optimizations in addition to Intel processor-specific optimizations. B -- Intel Pentium M processors and compatible Intel pro- cessors. Enables new optimizations in addition to Intel processor-specific optimizations. P -- Intel(R) Core(TM) Duo, Intel(R) Core Solo(TM), and Intel(R) Pentium(R) 4 Processors with Streaming SIMD Extensions 3 (SSE3) instruction support. Enables new optimizations in addition to Intel processor-specific optimizations including advanced data layout and code restructuring optimizations to improve memory accesses for Intel processors. Default for M*X32 systems. T -- Intel(R) Core(TM)2 Duo, Intel(R) Core(TM)2 Extreme, and the Dual-Core Intel(R) Xeon(R) processor 5100 series. Enables new optimizations in addition to Intel proces- sor-specific optimizations including advanced data layout and code restructuring optimizations to improve memory accesses for Intel processors. Note: The only -x options available on Intel(R) EM64T-based systems are -xW, -xP, and -xT. Note: On M*X32 systems, P is the only valid processor value. On these systems, -xP is the default and is always set. Note: If you specify more than one processor value, code is generated for only the highest-performing processor specified. For example, if you specify -xKW, only spe- cialized code for the Intel Pentium 4 processor is gener- ated. The highest-performing to lowest-performing pro- cessor values are: T, P, B, N, W, K. Note: Programs compiled using option -xN, -xB, or -xP will display a fatal run-time error if executed by an unsupported processor. For more information, see the Intel C++ Compiler User's Guide. Advanced Performance Options The advanced performance options allow fine tuning of compila- tion or allow control over advanced features of the compiler. -[no-]alias-args Assume [do not assume] arguments may be aliased. (DEFAULT = -no-alias-args). -[no-]ansi-alias The -[no-]ansi-alias option directs the compiler to assume that the program adheres to the rules defined in the ISO C Standard. If your program adheres to these rules, then this option will allow the compiler to opti- mize more aggressively. If it doesn't adhere to these rules, then it can cause the compiler to generate incor- rect code. -auto-ilp32 (i32em, i64 only) (not on M*X32) Instructs the compiler to analyze and transform the pro- gram so that 64-bit pointers are shrunk to 32-bit point- ers, and 64-bit longs (on Linux) are shrunk into 32-bit longs wherever it is legal and safe to do so. In order for this option to be effective the compiler must be able to optimize using the -ipo option and must be able to analyze all library or external calls the program makes. This option requires that the size of the program exe- cutable never exceeds 2 (to the 32nd power) bytes and all data values can be represented within 32 bits. If the program can run correctly in a 32-bit system, these requirements are implicitly satisfied. If the program violates these size restrictions, unpredictable behavior might occur. Note: The -auto-ilp32 option applies to i64 and i32em, but with i32em it has no effect unless option -xP or option -axP is also specified. It does not apply to i32. -[no-]complex-limited-range Tell the compiler to use the highest performance formula- tions of complex arithmetic operations, which may not produce acceptable results for input values near the top or bottom of the legal range. Without this option, the compiler uses a better formulation of complex arithmetic operations, thus producing acceptable results for the full range of input values, though at some loss in per- formance. -[no-]clomp-sharable-info (i32em, i64 only) Reports variables that the compiler automatically makes sharable for Cluster OpenMP*. -[no-]clomp-sharable-propagation (i32em, i64 only) Reports variables that need to be made sharable by the user with Cluster OpenMP*. -[no-]cluster-openmp (i32em, i64 only) Compiles an OpenMP* program for execution on a cluster. -[no-]cluster-openmp-profile (i32em, i64 only) Compiles an OpenMP* program for execution on a cluster, and links with a performance statistics library. -fargument-[no-]alias Same as -[no-]alias-args. -fargument-noalias-global Arguments do not alias each other and do not alias global storage. -[no-]fnsplit (i64 only) Enable[disable] function splitting. Function splitting is enabled by -prof-use in Phase 3 to improve code locality by splitting routines into different sections: one sec- tion to contain the cold or very infrequently executed code, and one section to contain the rest of the code (hot code). You can use -[no-]fnsplit to disable function splitting for the following reasons: · Most importantly, to get improved debugging capabil- ity. In the debug symbol table, it is difficult to represent a split routine, that is, a routine with some of its code in the hot code section and some of its code in the cold code section. · The -no-fnsplit option disables the splitting within a routine but enables function grouping, an opti- mization in which entire routines are placed either in the cold code section or the hot code section. Function grouping does not degrade debugging capa- bility. · When the profile data does not represent the actual program behavior, that is, when the routine is actu- ally used frequently rather than infrequently. -fp-model Enable floating point model variation. -ftls-model= Change thread-local storage model, where can be the following: · global-dynamic · local-dynamic · initial-exec · local-exec -ftz (i64 only) Flush denormal results to zero. -funroll-loops Unroll loops based on default heuristics. -[no-]inline-factor= Specifies the percentage multi- plier that should be applied to all inlining options that define upper limits. The value is a positive integer specifying the percentage value. The default value is 100 (a factor of 1). -inline-forceinline Specifies that an inline routine should be inlined when- ever the compiler can do so. (Default OFF) -[no-]inline-max-per-compile= Specifies the maximum number of times inlining may be applied to an entire compilation unit. The value is a positive integer that specifies the number of times inlining may be applied. (Default OFF) -[no-]inline-max-per-routine= Specifies the maximum number of times the inliner may inline into a particular routine. The value is a positive integer that specifies the maximum number of times the inliner may inline into a particular routine. (Default OFF) -[no-]inline-max-size= Specifies the lower limit for the size of what the inliner considers to be a large routine. The value is a positive integer that specifies the minimum size of what the inliner considers to be a large routine. (Default OFF) -[no-]inline-max-total-size= Specifies how much larger a routine can normally grow when inline expansion is performed. The value is a positive integer that specifies the permitted increase in the routine's size when inline expansion is performed. (Default OFF) -[no-]inline-min-size= Specifies the upper limit for the size of what the inliner considers to be a small routine. The value is a positive integer that specifies the maximum size of what the inliner considers to be a small routine. (Default OFF) -ip Enable additional interprocedural optimizations for sin- gle file compilation. These optimizations are a subset of full intra-file interprocedural optimizations. -IPF-flt-eval-method0 (i64 only) Direct the compiler to evaluate the expressions involving floating-point operands in the precision indicated by the variable types declared in the program. -[no-]IPF-fltacc (i64 only) Enable [disable] optimizations that affect floating point accuracy. By default (-IPF-fltacc-) the compiler may apply optimizations that reduce floating-point accuracy. You may use -IPF-fltacc or -mp to improve floating-point accuracy, but at the cost of disabling some optimiza- tions. -[no-]IPF-fma (i64 only) Enable [disable] the combining of floating point multi- plies and add/subtract operations. -IPF-fma[-] enables [disables] the contraction of floating-point multiply and add/subtract operations into a single operation. Unless -mp is specified, the compiler contracts these operations whenever possible. The -mp option disables the contrac- tions. -IPF-fma and -IPF-fma- can be used to override the default compiler behavior. -[no-]IPF-fp-relaxed (i64 only) Enable [disable] use of faster but slightly less accurate code sequences for math functions, such as divide and square root. -IPF-fp-speculation{fast|safe|strict|off} (i64 only) Enable floating point speculations with the following conditions: fast -- Speculate floating point operations safe -- Speculate only when safe strict -- Same as off off -- Disables speculation of floating-point operations -ip-no-inlining Disable inlining that would result from the -ip interpro- cedural optimization, but has no effect on other inter- procedural optimizations. -ip-no-pinlining (i32, i32em only) Disable partial inlining (requires -ip or -ipo) -ipo[value] Enables multifile IP optimizations (between files). When you specify this option, the compiler performs inline function expansion for calls to functions defined in sep- arate files. The [value] argument is an optional integer that speci- fies the number of object files the compiler should cre- ate. Any integer greater than or equal to 0 is valid. If [value] is 0, the compiler decides whether to create one or more object files based on an estimate of the size of the object file. It generates one object file for small applications, and two or more object files for large applications. If [value] is positive, the compiler generates [value] object files, unless [value] exceeds the number of source files (m), in which case the compiler generates only m object files. If you do not specify [value], the default is 1. -ipo-c Generate a multi-file object file (ipo-out.o) that can be used in further link steps. -ipo-S Generate a multi-file assembly file (ipo-out.s) that can be used in further link steps. -ipo-separate Creates one object file for every source file. This option overrides -ipo[value]. -ivdep-parallel (i64 only) Indicate there is absolutely no loop-carried memory dependency in any loop where IVDEP directive is speci- fied. This technique is useful for some sparse matrix applications. -mno-serialize-volatile (i64 only) Memory access ordering for volatile data object refer- ences may be suppressed. -mserialize-volatile (i64 only) Enable strict memory access ordering for volatile data object references. -openmp Enable the parallelizer to generate multi-threaded code based on the OpenMP* directives. The code can be executed in parallel on both uniprocessor and multiprocessor sys- tems. The -openmp option works with both -O0 (no opti- mization) and any optimization level of -O1, -O2 (default) and -O3. Specifying -O0 with -openmp helps to debug OpenMP applications. -openmp-profile Enables analysis of OpenMP* applications with Intel(R) Thread Profiler, which is required to use this option. -openmp-report[] Control the OpenMP parallelizer's level of diagnostic messages, where is one of the following: 0 -- no diagnostic information is displayed. 1 -- Display diagnostics indicating loops, regions, and sections successfully parallelized. (DEFAULT) 2 -- same as -openmp-report1 plus diagnostics indicating MASTER constructs, SINGLE constructs, CRITICAL con- structs, ORDERED constructs, ATOMIC directives, etc. suc- cessfully handled. -openmp-stubs Enable the user to compile OpenMP programs in sequential mode. The openmp directives are ignored and a stub OpenMP library is linked (sequential). -opt-mem-bandwidth (i64, L*X only) Enables or disables performance tuning and heuristics that control memory bandwidth use among processors. It allows the compiler to be less aggressive with optimiza- tions that might consume more bandwidth, so that the bandwidth can be well-shared among multiple processors for a parallel program. For values of greater than 0, the option tells the compiler to enable a set of per- formance tuning and heuristics in compiler optimizations such as prefetching, privatization, aggressive code motion, and so forth, for reducing memory bandwidth pres- sure and balancing memory bandwidth traffic among threads. The value is the level of optimizing for memory bandwidth usage. You can specify one of the fol- lowing values for : 0 -- Disables a set of performance tuning and heuristics in compiler optimizations for parallel code. This is the default for serial code. 1 -- Enables a set of performance tuning and heuristics in compiler optimizations for multithreaded code gener- ated by the compiler. This is the default if compiler option -parallel or -openmp is specified, or Cluster OpenMP option -cluster-openmp is specified (see the Clus- ter OpenMP documentation). 2 -- Enables a set of performance tuning and heuristics in compiler optimizations for parallel code such as Win- dows Threads, pthreads, and MPI code, besides multi- threaded code generated by the compiler. -opt-report Generate an optimization report and direct it to stderr. DEFAULT: The compiler does not generate optimization reports. -opt-report-file Specify the filename for the generated report -opt-report-help List the logical names of optimizers available for report generation. -opt-report-level[] Specify the level of report verbosity, where is one of the following: min -- The min argument provides the minimal summary (DEFAULT) med -- The med argument produces an intermediate-level report. max -- The max argument produces the full report. -opt-report-phase Specify the optimizer phase against which reports are generated. The compiler generates reports for the opti- mizer you specify in the . This option can be used multiple times on the same command line to generate reports for multiple optimizers. Currently, the following optimizer reports are supported: ipo -- Interprocedural Optimizer hlo -- High Level Optimizer ilo -- Intermediate Language Scalar Optimizer ecg -- Code Generator omp -- OpenMP all -- All phases When one of the above logical names for optimizers is specified for , all reports from that optimizer are generated. -opt-report-routine Generate reports from all routines with names containing as part of their name. If is not specified, reports from all routines are generated. DEFAULT: The compiler generates reports for all routines. -p Compile and link for function profiling with Linux gprof* tool. Same as -qp. -parallel Enable the auto-parallelizer to generate multi-threaded code for loops that can be safely executed in parallel. The -parallel option enables the auto-parallelizer if either the -O2 or -O3 optimization option is also on (the default is -O2). -par-report[] Control the level of auto-parallelizer diagnostic mes- sages, where is one of the following: 0 -- no diagnostic information is displayed. 1 -- indicates loops successfully auto-parallelized (DEFAULT). Issues a "LOOP AUTO-PARALLELIZED" message for parallel loops. 2 -- indicates successfully auto-parallelized loops as well as unsuccessful loops. 3 -- same as 2 plus additional information about any proven or assumed dependencies inhibiting auto-paral- lelization (reasons for not parallelizing). -par-threshold[] Set a threshold for the auto-parallelization of loops based on the probability of profitable execution of the loop in parallel. This option is used for loops whose computation work volume cannot be determined at com- pile-time. The threshold is usually relevant when the loop trip count is unknown at compile-time. =0-100. (DEFAULT: =75) The compiler applies a heuristic that tries to balance the overhead of creating multiple threads versus the amount of work available to be shared amongst the threads. -[no-]prefetch (i64 only) Enables [disables] the insertion of software prefetching by the compiler. Default is -prefetch. -prof-dir Specify directory for profiling output files (*.dyn and *.dpi). Use the -prof-dir option with prof-gen as recommended for most programs, especially if the applica- tion includes the source files located in multiple direc- tories. -prof-dir ensures that the profile information is generated in one consistent place. -prof-file Specify file name for profiling summary file -prof-gen[x] Instruct the compiler to produce instrumented code in your object files in preparation for instrumented execu- tion. With the x qualifier, extra information is gath- ered. This option is used in Phase 1 of PGO to instruct the compiler to produce instrumented code in your object files in preparation for instrumented execution. Parallel make is automatically supported for -prof-genx compila- tions. -prof-gen-sampling Prepare code for use with the profrun sample gathering tool. -prof-use Instruct the compiler to produce a profile-optimized exe- cutable and merge available dynamic information (.dyn) files into a pgopti.dpi file. Use the -prof-use option in Phase 3 of PGO. -qp Compile and link for function profiling with Linux gprof* tool. Same as -p. -ssp (i32 only) Enable software-based speculative pre-computation. -tcheck The -tcheck compiler option enables analysis of threaded applications with Intel(R) Thread Checker, which is required to use this option. -unroll (i32, i32em only) Set maximum number of times to unroll loops. This applies only to loops that the compiler determines should be unrolled. Omit n to let the compiler decide whether to perform unrolling or not. Use n=0 to disable loop unrolling. -unroll0 (i64 only) Disable loop unrolling. For i64: the only allowed value is 0. -vec-report[] (i32, i32em only) Control the vectorizer's level of diagnostic messages, where is one of the following: 0 -- No diagnostic information 1 -- Indicate vectorized loops (DEFAULT) 2 -- Indicate vectorized/non-vectorized loops 3 -- Indicate vectorized/non-vectorized loops and pro- hibiting data dependence information 4 -- Indicate non-vectorized loops 5 -- Indicate non-vectorized loops and prohibiting data dependence information If you use -c, -ipo with -vec-report{n} option or -c, -x{K|W|N|B|P|T} or -ax{K|W|N|B|P|T} with -vec-report[], the compiler issues a warning and no report is generated. Output, Debug, and PCH Options The output, debug, and PCH options provide control over compiler output, setup for debugging, and use of the precompiled header features of the compiler. -c Compile to object (.o) only, do not link. -create-pch Manual creation of precompiled header . Use the -create-pch option if you want the compiler to create a PCH file called . The filename param- eter must be specified. The filename parameter can be a full path name. The full path to filename must exist. The .pchi extension is not automatically appended to filename. This option cannot be used in the same compila- tion as -use-pch filename. The -create-pch filename option is supported for single source file compilations only. -[no-]debug[keyword] Enable debug information and control output of enhanced debug information. The supported [keywords] are extended, [no]variable-locations, [no]semantic-stepping, [no-]expr-source-pos, and [no]inline_debug_info}. The debug switches control emission of enhanced debug infor- mation. They must be used in conjunction with the basic -g switches that request debug information. extended -- Turns on the -debug options; · -debug [no-]expr-source-pos, · -debug [no]variable-locations, · -debug [no]semantic-stepping, and · -debug [no]inline_debug_info. [no-]expr-source-pos -- Determines whether source posi- tion information at the expression level of granularity is produced. [no]variable-locations -- Determines whether enhanced debug information useful in finding scalar local vari- ables is produced. [no]semantic-stepping -- Determines whether enhanced debug information useful for breakpoints and stepping is produced. [no]inline_debug_info -- Determines whether enhanced debug information is produced for inlined code. -fcode-asm Produce assembly file with optional code annotations. -fsource-asm Produce assembly file with optional code annotations. -ftrapuv Initializes stack local variables to an unusual value to help error detection. -f[no]verbose-asm Produce assembly file with compiler comments (DEFAULT). -g Produce symbolic debug information in object file. The compiler does not support the generation of debugging information in assemblable files. If you specify the -g option, the resulting object file will contain debugging information, but the assemblable file will not. The -g option changes the default optimization from -O2 to -O0. If you specify -g with -O1, -O2, or -O3, then -fp is dis- abled and allows the compiler to use the EBP register as a general-purpose register in optimizations. However, most debuggers expect EBP to be used as a stack frame pointer, and cannot produce a stack backtrace unless this is so. Using the -fp option can result in slightly less efficient code. i32 only: Specifying the -g or -O0 option automatically enables the -fp option. -g0 Disable generation of symbolic debug information. -inline-debug-info Preserve the source position of inlined code instead of assigning the call-site source position to inlined code. -map-opts (not on M*X32) Enable option mapping tool. -o This option specifies the name of an output file as fol- lows: · If the -c option is specified, it specifies the name of the generated object file. · If the -S option is specified, it specifies the name of the generated assembly listing file. · If the -P option is specified, it specifies the name of the generated preprocessor file. Otherwise, it specifies the name of the executable file. -pch Automatic processing for precompiled headers. Direct the compiler to use appropriate PCH files. If none are available, they are created as sourcefile.pchi. This option supports multiple source files. Note: The -pch option uses PCH files created from other sources if the headers files are the same. For example, if you compile source1.cpp using -pch, then source1.pchi is created. If you then compile source2.cpp using -pch, the compiler will use source1.pchi if it detects the same headers. -pch-dir Directs the compiler to find and/or create a file for pre-compiled headers in dirname. Use the -pch-dir option to specify the path (dirname) to the PCH file. You can use this option with -pch, -create-pch filename, and -use-pch filename. -print-multi-lib Print information about libraries being used. -S Compile to an assemblable file (.s), then stop the compi- lation. -use-asm Produce objects through the assembler. Note: GNU inline assembler (asm) code and Microsoft inline assembler (msasm) code cannot be used together in the same translation unit. -use-msasm (i32, i32em only) Support Microsoft* style assembly language insertion using MASM style syntax and, if requested, output assem- bly in MASM format. Note: GNU inline assembler (asm) code and Microsoft inline assembler (msasm) code cannot be used together in the same translation unit. -use-pch Manual use of precompiled header (filename.pchi). This option directs the compiler to use the PCH file specified by filename. It cannot be used in the same compilation as -create-pch . The -use-pch option supports full path names and supports multiple source files when all source files use the same .pchi file. Preprocessor Options The preprocessor options listed here control preprocessing oper- ations for the compiler. -A- Remove all predefined macros. Causes all predefined macros and assertions to be inactive. -A[] Associate a symbol with the specified sequence of . Equivalent to an #assert preprocessing direc- tive. -C Preserve comments in preprocessed source output. Comments following preprocessing directives are not preserved. -D[=] Define the macro and associate it with the speci- fied . Equivalent to a #define preprocessing directive. DEFAULT: -D defines the macro with a of 1. -dD Same as -dM, but outputs #define directives in prepro- cessed source. -dM Output macro definitions in effect after preprocessing (use with -E). -dN Same as -dD, but #define directives contain only macro names. -E Direct the preprocessor to expand your source module and write the result to standard output. The preprocessed source contains #line directives, which the compiler uses to determine the source file and line number. -EP Direct the preprocessor to expand your source module and write the result to standard output. Does not include #line directives in the output. -EP is equivalent to -E -P. -H Print "include" file order and continue compilation. -I Add directory to include file search path. For mul- tiple search directories, multiple I commands must be used. The compiler searches directories for include files in the following order: 1. Directory of the source file that contains the include. 2. Directories specified by the -I option. -idirafter Add directory to the second include file search path (after -I). -imacros Treat as an #include file, but throw away all pre- processing while the macros that are defined remain defined. -iprefix Use with -iwithprefix as a prefix. -iquote Add to the front of the include file search path for files included with quotes but not brackets. (DEFAULT = OFF) -isystem Add directory to the start of the system include path. -iwithprefix Append to the prefix passed in by -iprefix and put it on the include search path at the end of the include directories. -iwithprefixbefore Similar to -iwithprefix except the include directory is placed in the same place as the -I command line include directories. -M Generate makefile dependency lines for each source file, based on the #include lines found in the source file. -MD Preprocess and compile. Generate output file (.d exten- sion) containing dependency information. -MF Generate makefile dependency information in . Must specify -M or -MM. -MG Similar to -M, but treats missing header files as gener- ated files. -MM Similar to -M, but does not include system header files. -MMD Similar to -MD, but does not include system header files. -MP Add a phony target for each dependency. -MQ Same as -MT, but quotes special Make characters. -MT Change the default target rule for dependency generation. -no-gcc Do not predefine the __GNUC__, __GNUC_MINOR__, and __GNUC_PATCHLEVEL__ macros. -nostdinc Same as -X. -P Direct the preprocessor to expand your source module and store the result in a .i file in the current directory. Unlike the -E option, the output from -P does not include #line number directives. By default, the preprocessor creates the name of the output file using the prefix of the source file name with a .i extension. Caution: When you use the -P option, any existing files with the same name and extension are overwritten. -U Remove predefined macro. Equivalent to a #undef prepro- cessing directive. -X Remove standard directories from include file search path. You can use the -X option with the -I option to prevent the compiler from searching the default path for include files and direct it to use an alternate path. Component Control Options You can direct the compiler to specify alternate tools for pre- processing, compilation, assembly, and linking. Further, you can invoke options specific to your alternate tools on the command line. These are the component control options. -Qinstall Set as the root of the compiler installation. -Qlocation,, Set as the location of the tool specified by . may be cpp, c, asm, or ld. is the complete path to the tool. For example: -Qlocation,gas, Specifies the GNU assembler. -Qlocation,gld, Specifies the GNU linker. -Qoption,, Pass options to the tool specified by . may be cpp, c, asm, or ld. The argument indicates one or more valid argument strings for the des- ignated program. If the argument is a command-line option, you must include the hyphen. If the argument con- tains a space or tab character, you must enclose the entire argument in quotation characters (""). You must separate multiple arguments with commas. Language Options The language options define parameters and standards for the compiler with reference to the C/C++ source files. -[no]align (i32, i32em only) Analyze and reorder memory layout for variables and arrays. -ansi Support all ANSI standard C programs, equivalent to the -ansi option of gcc. -[no-]c99 Enable [disable] C99 support for C programs. -export Enable recognition of exported templates. Supported in C++ mode only. -export-dir Specifies a directory name for the exported template search path. -fno-gnu-keywords Do not recognize 'typeof' as a keyword. -fno-implicit-inline-templates Do not emit code for implicit instantiations of inline templates. -fno-implicit-templates Never emit code for non-inline templates which are instantiated implicitly (i.e. by use); only emit code for explicit instantiations. -f[no-]non-lvalue-assign Allow [disallow] casts and conditional expressions to be used as lvalues. (DEFAULT = allow) -fno-operator-names Disable support for operator name keywords. -fpermissive Allow for non-conformant code. -f[no-]rtti Enable [disable] RTTI support. -fshort-enums Allocate as many bytes as needed for enumerated types. -fsyntax-only Same as -syntax. -ftemplate-depth- Control the depth to which recursive templates are expanded. -funsigned-bitfields Change default bitfield type to unsigned. -funsigned-char Change default char type to unsigned. -Kc++ Compile all source or unrecognized file types as C++ source files. -malign-double (i32, i32em only) Same as -align. -[no]restrict Enable [disable] the "restrict" keyword for disambiguat- ing pointers. -std=c99 Enable C99 support for C programs -strict-ansi Select strict ANSI C/C++ conformance dialect -Zp[n] Specify alignment constraint for structure and union types, where n is one of the following: 1,2,4,8,16. Compiler Diagnostics Options The compiler diagnostics options define and control aspects of the compilation associated with diagnostics. -[no]traceback Tells the compiler to generate [not generate] extra information in the object file to allow the display of source file traceback information at run time when a severe error occurs. This is intended for use with C code that is to be linked into a Fortran program. -w Disable all warnings. Displays error messages only. -w Control diagnostics, where is one of the following: 0 -- Display errors (same as -w) 1 -- Display warnings and errors (DEFAULT) 2 -- Display remarks, warnings, and errors -W[no-]abi Warn [do not warn] if generated code is not C++ ABI com- pliant (Default = -Wno-abi). -Wall Enable all warnings. -Wbrief Print brief one-line diagnostics. When enabled, the orig- inal source line is not displayed and the error message text is not wrapped when too long to fit on a single line. -Wcheck Enable more strict diagnostics. Performs compile-time code checking for code that exhibits non-portable behav- ior, represents a possible unintended code sequence, or possibly affects operation of the program because of a quiet change in the ANSI C Standard. -W[no-]comment[s] Warn when /* appears in the middle of a /* */ comment. -Wcontext-limit= Set maximum number of template instantiation contexts shown in diagnostic. -wd[,,...] Disable diagnostics L1 through LN. -W[no-]deprecated Print warnings related to deprecated features. -we[,,...] Change severity of diagnostics L1 through LN to error. -Werror Force warnings to be reported as errors. -Winline Enable inline diagnostics. -W[no-]main Warn if return type of main is not expected. -W[no-]missing-prototypes Warn for missing prototypes. -wn Print a maximum of errors displayed before the com- piler aborts. By default, if more than 100 errors are displayed, compilation aborts. Remarks and warnings do not count towards this limit. -Wp64 Print diagnostics for 64-bit porting. -W[no-]pointer-arith Warn for questionable pointer arithmetic. -wr[,,...] Change severity of diagnostics L1 through LN to remark. -W[no-]return-type Warn when a function uses the default int return type and warn when a return statement is used in a void function. -W[no-]shadow Warn if a variable declaration hides a previous variable declaration. -W[no-]uninitialized Warn if a variable is used before being initialized. -W[no-]unknown-pragmas Warn if an unknown #pragma directive is used (DEFAULT). -W[no-]unused-function Warn if declared function is not used. -ww[,,...] Change severity of diagnostics L1 through LN to warning. Miscellaneous Options The miscellaneous options cover a variety of unrelated tasks related to the compiler. -B Specifies the directory (dir) that can be used to find libraries, headers, and executables for the compiler itself. -dryrun Show driver tool commands but do not execute tools. -dumpversion (not on M*X32) Return the version number of the compiler. -fabi-version= Instructs the compiler to select a specific ABI implemen- tation, where is the ABI implementation. Possible values are:. 0 -- Requests all the latest ABI fixes. Default if gcc version 3.2 is installed. 1 -- Requests the ABI used in gcc 3.3. Default if gcc version 3.3 is installed. 2 -- Requests the ABI used in gcc 3.4 and higher. Default if gcc version 3.4 or higher is installed. -f[no-]common Enables the compiler to treat common variables as if they were defined, allowing the use of gprel addressing of common data variables. -f[no-]math-errno Set ERRNO after calling standard math library functions. -fminshared Compilation is for the main executable. Absolute address- ing can be used and non-position independent code gener- ated for symbols that are at least protected. -fno-builtin Disable inline expansion of intrinsic functions. -fno-builtin- Disable the intrinsic. -fpack-struct Pack structure members together. -f[no-]pic, -f[no-]PIC i32: This option generates position independent code. By default this option is OFF. i64: This option generates code allowing full symbol pre- emption. By default this option is OFF. -fr32 (i64 only) Disable use of high floating point registers. Use only lower 32 floating-point registers. -freg-struct-return Return struct and union values in registers when possi- ble. -fstack-security-check (i32, i32em only) Enable overflow security checks. -fvisibility=[extern|default|protected|hidden|internal] Global symbols (data and functions) will get the visibil- ity attribute given by default. Symbol visibility attributes explicitly set in the source code or using the symbol visibility attribute file options will override the -fvisibility setting. -fvisibility-default= Space separated symbols listed in the argument will get visibility set to default. -fvisibility-extern= Space separated symbols listed in the argument will get visibility set to extern. -fvisibility-hidden= Space separated symbols listed in the argument will get visibility set to hidden. -fvisibility-inlines-hidden (i32 only) Causes inline member functions (those defined in the class declaration) to be marked hidden. -fvisibility-internal= (not on M*X32) Space separated symbols listed in the argument will get visibility set to internal. -fvisibility-protected= (not on M*X32) Space separated symbols listed in the argument will get visibility set to protected. -[no-]gcc-extern-inline The -gcc-extern-inline flag, by default, lays down a body for a function declared to be extern inline. The gcc com- piler, however, never lays down a body for a function declared to be extern inline. Instead, gcc treats the function as if it were declared extern but with no defi- nition in the compilation unit. No body is created unless the function cannot be inlined for some reason (for example, its address might be taken). The body laid down for a function because of this flag will always be weak so a non-weak definition elsewhere in the compilation will be used instead. If you want the C99 behavior rather than the now default (more) gcc like behavior, use the -no-gcc-extern-inline flag. This flag is on (i.e. -gcc-extern-inline) by default. -gcc-name= Use this option to specify the location of g++ when com- piler cannot locate gcc C++ libraries. For use with -cxxlib- configuration. The argument is the full path location of g++. Use this option when refer- encing a non-standard gcc installation. -gcc-version= This option provides compatible behavior with gcc, where indicates the gcc version. The required values for are: not set -- if gcc version is older than 3.2 320 -- if gcc version is 3.2 330 -- if gcc version is 3.3 340 -- if gcc version is 3.4 400 -- if gcc version is 4.0 410 -- if gcc version is 4.1 Note: The version number follows a format where the first number represents the major version, the second number represents the minor version, and the third number is normally zero. For example, the 3.3.1 gcc version is represented as 330. -[no-]global-hoist Enables [disables] hoisting and speculative loads of global variables. -help Print list of compiler options. -kernel (i64 only) Generates code for inclusion in the kernel. Prevents gen- eration of speculation as support may not be available when code runs. Suppresses software pipelining. -long_double (i32, i32em only) Enable 80-bit 'long double'. The -long_double option is ON by default (80-bit) for L*X and M*X32. -mfixed-range= (i64 only) Reserves certain registers (=f12-f15, f32-f127) for use by the kernel. -[no-]multibyte-chars Provide support for multi-byte characters. -nobss-init Place variables that are initialized with zeroes in the DATA section instead of the BSS section. -reserve-kernel-regs (i64 only) Reserves registers f12-f15 and f32-f127 for use by the kernel. These will not be used by the compiler. -[no-]sox Enable (DEFAULT) [disable] saving of compiler options and version in the executable. -V Display compiler version information. -v Show driver tool commands and execute tools. --version Display GCC style version information. Note that two '-'s are required. -x All source files found subsequent to -x will be recognized as one of the following types: c -- C source file c++ -- C++ source file c-header -- C header file cpp-output -- C pre-processed file c++-cpp-output -- C++ pre-processed file assembler -- Assembly file assembler-with-cpp -- Assembly file that needs to be pre- processed none -- Disable recognition, and revert to file extension Linking or Linker Options The linking/linker options group all link-related options together. -cxxlib- Tells the compiler to link using certain C++ runtime libraries. You can specify one of the following values for : gcc[=] -- Link using the C++ run-time libraries pro- vided with the gcc compiler. The parameter is an optional top-level location for the gcc binaries and libraries. icc -- Link using the C++ run-time libraries provided by Intel. -dynamic-linker Select a dynamic linker (filename) other than the default. -dynamiclib (i32, M*X32 only) Invokes the libtool command to generate dynamic libraries. -i-dynamic Link Intel provided libraries dynamically. -i-static Links Intel-provided libraries statically. -L or -l Instruct the linker to search for a specified library when linking. Because the linker searches and pro- cesses libraries and object files in the order they are specified, specify this option following the last appli- cable object file. -mcmodel= (i32, L*X only) Tells the compiler to use a specific memory model to gen- erate code and store data. Default is -mcmodel=small. -m[no-]relax (i64 only) Pass [do not pass] -relax to the linker. (DEFAULT = -mno-relax) -no-cpprt Do not link in C++ runtime libraries. -nodefaultlibs Do not use standard libraries when linking. -nostartfiles Do not use standard startup files when linking. -nostdlib Do not use standard libraries and startup files when linking. -shared (not on M*X32) Produce a shared object. -shared-libcxa Link Intel libcxa C++ library dynamically, overriding the default behavior when -static is used. This option has the opposite effect of -static-libcxa. When this option is used, the Intel-provided libcxa C++ library is linked in dynamically, allowing the user to override the static linking behavior when the -static option is used. -static (not on M*X32) Prevent linking with shared libraries. Causes the exe- cutable to link all libraries statically, as opposed to dynamically. -static-libcxa Link Intel libcxa C++ library statically. By default, the Intel-provided libcxa C++ library is linked in dynami- cally. Use -static-libcxa on the command line to link libcxa statically, while still allowing the standard libraries to be linked in by the default behavior. -T Direct linker to read link commands from . -u Pretend the is undefined. -Wa[,,...] -Wl,[,,...] -Wl,[,,...] Pass options o1, o2, etc. to the linker for processing. -Xlinker (i32, i32em only) Pass directly to the linker for processing. Mac OS Options The Mac OS options provide specific capabilities that apply only to the Intel C++ compiler for the Mac OS. Most other i32 C++ compiler options (except those identified with a (not on M*X32) notation) also apply to the Mac OS. -F (M*X32 only) Add a framework directory to the head of an include file search path. -fpascal-strings (M*X32 only) Allow for Pascal-style string literals. -malign-mac68k (M*X32 only) Aligns structure fields on 2-byte boundaries (m68k com- patible). -malign-natural (M*X32 only) Aligns larger types on natural size-based boundaries (overrides ABI). -malign-power (M*X32 only) Aligns based on ABI-specified alignment rules (default for M*X32 only). -mdynamic-no-pic (M*X32 only) Code is not relocatable, but external references are relocatable. Optimization Levels The Intel C++ Compiler applies the following optimizations when you invoke the -O1, -O2, or -O3 options: · Constant propagation · Copy propagation · Dead-code elimination · Global register allocation · Instruction scheduling · Loop unrolling (-O2, -O3 only) · Loop-invariant code movement · Partial redundancy elimination · Strength reduction/induction variable simplification · Variable renaming · Exception handling optimizations · Tail recursions · Peephole optimizations · Structure assignment lowering and optimizations · Dead store elimination · Loop-invariant code motion. Depending on the Intel architecture, optimization options can have different effects. To specify optimizations for your target architecture, refer to the -O[0|1|2|3], -fast, -ax, -x, and related options. Optimizing Exclusively for Specific Processors (i32, i32em only) (not on M*X32) The -x{K|W|N|B|P|T} options target your program to run on a spe- cific Intel processor. The resulting code might contain uncon- ditional use of features that are not supported on other proces- sors. If these options are used on a non-compatible processor, the program might fail with an illegal instruction exception, or it might display other unexpected behavior. Do not specify this option if the program will be executed on x86 processors not provided by Intel Corporation. For more information, see the Intel C++ Compiler User's Guide. Note: The -x option is not supported on M*X32 for this release. Compilations for M*X32 use the -xP option values to generate code for Intel Pentium 4 Processors with Streaming SIMD Extensions 3 (SSE3). Automatic Processor-specific Optimization (i32, i32em only) (not on M*X32) The -ax{K|W|N|B|P|T} options direct the compiler to find opportunities to generate separate versions of functions that use instructions supported on the specified processors. If the compiler finds such an opportunity, it first checks whether gen- erating a processor-specific version of a function is likely to result in a performance gain. If so, the compiler generates both a processor-specific version of a function and a generic version of the function. The generic version will run on any IA-32 pro- cessor. At run time, one of the versions is chosen to execute, depending on the current processor. In this way, the program can benefit from performance gains on more advanced processors, while still working properly on older processors. The disadvantages of using -ax{K|W|N|B|P|T} are: · The size of the compiled binary increases because it con- tains both a processor-specific version of some of the code and a generic version of the code. · Performance is affected by the run-time checks to determine which code to run. Interprocedural Optimizations (IPO) Use -ip and -ipo[value] to enable interprocedural optimizations (IPO), which allow the compiler to analyze your code to deter- mine where to apply the following optimizations: inline function expansion, interprocedural constant propagation, monitoring mod- ule-level static variables, dead code elimination, propagation of function characteristics, and multifile optimization. For IA-32, IPO also passes arguments in registers. Inline function expansion is one of the main optimizations per- formed by the interprocedural optimizer. For function calls that the compiler believes are frequently executed, the compiler might decide to replace the instructions of the call with code for the function itself (inline the call). See the Intel C++ Compiler User's Guide for more complete infor- mation on IPO. Profile-guided Optimizations (PGO) Profile-guided optimizations (PGO) tell the compiler which areas of an application are most frequently executed. By knowing these areas, the compiler is able to use feedback from a previous com- pilation to be more selective in optimizing the application. For example, the use of PGO often enables the compiler to make bet- ter decisions about function inlining, thereby increasing the effectiveness of interprocedural optimizations. PGO creates an instrumented program from your source code and special code from the compiler. Each time this instrumented code is executed, the instrumented program generates a dynamic infor- mation file. When you compile a second time, the dynamic infor- mation files are merged into a summary file. Using the profile information in this file, the compiler attempts to optimize the execution of the most heavily traveled paths in the program. The PGO methodology requires three phases: Phase 1: Instrumentation compilation and linking with -prof-gen[x] Phase 2: Instrumented execution by running the executable Phase 3: Feedback compilation with -prof-use See the Intel C++ Compiler User's Guide for more complete infor- mation on PGO. High-level Language Optimizations (HLO) High-level language optimizations (HLO) exploit the properties of source code constructs, such as loops and arrays, in applica- tions developed in high-level programming languages, such as C++. They include loop interchange, loop fusion, loop unrolling, loop distribution, unroll-and-jam, blocking, data prefetch, scalar replacement, data layout optimizations, and others. Vectorization Options (i32 only) The vectorizer is a component of the Intel C++ Compiler that automatically uses SIMD instructions in the MMX, SSE, and SSE2 instruction sets. The vectorizer detects operations in the pro- gram that can be executed in parallel, and then converts the sequential program to process 2, 4, 8, or 16 elements in one operation, depending on the data type. The -x{K|W|N|B|P|T} and -ax{K|W|N|B|P|T} options enable the vec- torizer. See the Intel C++ Compiler User's Guide for more com- plete information on the vectorizer. Auto Parallelization Options The auto-parallelization feature of the Intel C++ Compiler auto- matically translates serial portions of the input program into equivalent multithreaded code. The auto-parallelizer analyzes the dataflow of the program's loops and generates multithreaded code for those loops which can be safely and efficiently exe- cuted in parallel. This enables the potential exploitation of the parallel architecture found in symmetric multiprocessor (SMP) systems. The parallel run-time support provides the same run-time fea- tures found in OpenMP*, such as handling the details of loop iteration modification, thread scheduling, and synchronization. While OpenMP directives enable serial applications to transform into parallel applications quickly, the programmer must explic- itly identify specific portions of the application code that contain parallelism and add the appropriate compiler directives. Auto-parallelization triggered by the -parallel option automati- cally identifies those loop structures that contain parallelism. During compilation, the compiler automatically attempts to decompose the code sequences into separate threads for parallel processing. No other effort by the programmer is needed. Parallelization with OpenMP* The Intel C++ Compiler supports the OpenMP* C++ version 2.0 API specification. The compiler performs transformations to generate multithreaded code based on the user's placement of OpenMP directives in the source program making it easy to add threading to existing software. The Intel compiler supports all of the current industry-standard OpenMP directives, except WORKSHARE, and compiles parallel programs annotated with OpenMP directives. In addition, the compiler provides Intel-specific extensions to the OpenMP C++ version 2.0 specification including run-time library routines and environment variables. Note: As with many advanced features of compilers, you must properly understand the functionality of the OpenMP directives in order to use them effectively and avoid unwanted program behavior. The Cluster OpenMP* (CLOMP or Cluster OMP) options are available under a separate license for the Cluster OpenMP product (i32em, i64 only). Precompiled Headers The Intel C++ Compiler supports precompiled header (PCH) files to significantly reduce compile times using the options described below. If many of your source files include a common set of header files, place the common headers first, followed by the #pragma hdrstop directive. This pragma instructs the com- piler to stop generating PCH files. For example, if source1.cpp, source2.cpp, and source3.cpp all include common.h, then place #pragma hdrstop after common.h to optimize compile times. See the Intel C++ Compiler User's Guide for more complete information on Precompiled Headers. Caution: Depending on how you organize the header files listed in your sources, these options might increase compile time. DEPRECATED AND REMOVED OPTIONS Occasionally, compiler options are marked as "deprecated." Dep- recated options are still supported in the current release, but are planned to be unsupported in future releases. Some compiler options are no longer supported and have been removed. If you use one of these options, the compiler issues a warning, ignores the option, and then proceeds with compilation. Deprecated Options The following options are deprecated in this release of the com- piler: -F Suggested replacement -P. -fwritable-strings No suggested replacement. -Knopic, -KNOPIC Suggested replacement -fpic. -Kpic, -KPIC Suggested replacement -fpic. -Knopic, -KNOPIC Suggested replacement -fpic. -march=pentiumii Suggested replacement -march=pentium2. -march=pentiumiii Suggested replacement -march=pentium3. -pro-format-32 No suggested replacement. -syntax Suggested replacement -fsyntax-only. -tpp5 No suggested replacement. -tpp6 No suggested replacement. -tpp7 No suggested replacement. Removed Options The following options are removed in this release of the com- piler: -axi -axm -fdiv_check -ipo-obj, and -ipo_obj -0f_check -xi -xM PREDEFINED MACROS The predefined macros available for the Intel C++ Compiler are described below. Intel C++ Compiler Predefined Macros __ARRAY_OPERATORS Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __BASE_FILE__ Value on IA-32 -- Name of source file Value on EM64T -- Name of source file Value on Itanium Architecture -- Name of source file _BOOL Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __cplusplus Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __DEPRECATED Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __EDG__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __EDG_VERSION__ Value on IA-32 -- 304 Value on EM64T -- 304 Value on Itanium Architecture -- 304 __ELF__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __EXCEPTIONS Value on IA-32 -- Defined as 1 when -fno-exceptions is not used. Value on EM64T -- Defined as 1 when -fno-exceptions is not used. Value on Itanium Architecture -- Defined as 1 when -fno-exceptions is not used. __extension__ Value on IA-32 -- no value Value on EM64T -- no value Value on Itanium Architecture -- no value __GNUC__ Values on IA-32, EM64T, or Itanium Architecture -- 2 -- if gcc version is less than 3.2 3 -- if gcc version is 3.2, 3.3, or 3.4 4 -- if gcc version is 4.x __GNUC_MINOR__ Values on IA-32, EM64T, or Itanium Architecture -- 95 -- if gcc version is less than 3.2 2 -- if gcc version is 3.2 3 -- if gcc version is 3.3 4 -- if gcc version is 3.4 __GNUC_PATCHLEVEL__ Values on IA-32, EM64T, or Itanium Architecture -- 3 -- if gcc version is 3.x __gnu_linux__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __GXX_ABI_VERSION Value on IA-32 -- 102 Value on EM64T -- 102 Value on Itanium Architecture -- 102 __HONOR_STD Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- NA __i386 Value on IA-32 -- 1 Value on EM64T -- NA Value on Itanium Architecture -- NA __i386__ Value on IA-32 or EM64T -- 1 Value on EM64T -- NA Value on Itanium Architecture -- NA i386 Value on IA-32 -- 1 Value on EM64T -- NA Value on Itanium Architecture -- NA __ia64 Value on IA-32 -- NA Value on EM64T -- NA Value on Itanium Architecture -- 1 __ia64__ Value on IA-32 -- NA Value on EM64T -- NA Value on Itanium Architecture -- 1 __ICC Value on IA-32 -- 910 Value on EM64T -- 910 Value on Itanium Architecture -- NA Notes -- Assigned value refers to the compiler (e.g., 800 is 8.00). Supported for legacy reasons. Use __INTEL_COM- PILER instead. _INTEGRAL_MAX_BITS Value on IA-32 -- NA Value on EM64T -- NA Value on Itanium Architecture -- 64 __INTEL_COMPILER Value on IA-32 -- 910 Value on EM64T -- 910 Value on Itanium Architecture -- 910 Notes -- Defines the compiler version. Defined as 910 for the Intel C++ Compiler 9.1. __INTEL_COMPILER_BUILD_DATE= Notes -- Defines the compiler build date. This date should correspond to the date on the compiler version banner. Applies to IA-32, EM64T, and Itanium Architec- ture. __INTEL_CXXLIB_ICC Notes -- Is defined (default) as 1 when the -cxxlib-icc option is specified during compilation. Applies to both IA-32 and Itanium Architecture, but not to EM64T. __INTEL_RTTI__ Notes -- Is defined (default) when the -frtti option is specified for the Intel Linux C++ compiler (i.e., when RTTI support is enabled). It is disabled when the the -fno-rtti option is specified for the Intel Linux C++ compiler. Applies to IA-32, EM64T, and Itanium Architec- ture. __INTEL_STRICT_ANSI__ Notes -- Is defined (default) as 1 when the -strict_ansi option is specified for the Intel Linux C++ compiler (i.e., strict ANSI conformance dialect). Applies to IA-32, EM64T, and Itanium Architecture. __itanium__ Value on IA-32 -- NA Value on EM64T -- NA Value on Itanium Architecture -- 1 __linux Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __linux__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 linux Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __LONG_DOUBLE_SIZE__ Value on IA-32 -- 80 Value on EM64T -- 80 Value on Itanium Architecture -- 80 __LONG_MAX__ Value on IA-32 -- NA Value on EM64T -- 9223372036854775807L Value on Itanium Architecture -- 9223372036854775807L __lp64 Value on IA-32 -- NA Value on EM64T -- NA Value on Itanium Architecture -- 1 __LP64__ Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- 1 _LP64 Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- 1 _MT Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- NA __MMX__ Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- NA __NO_INLINE__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __NO_MATH_INLINES Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __NO_STRING_INLINES Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 _OPENMP Value on IA-32 -- 200203 Value on EM64T -- 200203 Value on Itanium Architecture -- 200203 Notes -- Defined when -openmp is used. __OPTIMIZE__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 Notes -- Not enabled if all optimizations are turned off. __pentium4 Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- NA __pentium4__ Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- NA __PIC__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 Notes -- Defined when -fPIC is used. __pic__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 Notes -- Defined when -fPIC is used. _PGO_INSTRUMENT Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 Notes -- Defined when compiled with either -prof_gen or -prof_genx. _PLACEMENT_DELETE Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __PTRDIFF_TYPE__ Value on IA-32 -- int Value on EM64T -- long Value on Itanium Architecture -- long __REGISTER_PREFIX__ Value on IA-32 -- no value Value on EM64T -- no value Value on Itanium Architecture -- no value __SIGNED_CHARS__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __SIZE_TYPE__ Value on IA-32 -- unsigned Value on EM64T -- unsigned long Value on Itanium Architecture -- unsigned long __SSE__ Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- NA __SSE2__ Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- NA __unix Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __unix__ Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 unix Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __USER_LABEL_PREFIX__ Value on IA-32 -- (no value) Value on EM64T -- (no value) Value on Itanium Architecture -- (no value) __WCHAR_T Value on IA-32 -- 1 Value on EM64T -- 1 Value on Itanium Architecture -- 1 __WCHAR_TYPE__ Value on IA-32 -- long int Value on EM64T -- int Value on Itanium Architecture -- int __WINT_TYPE__ Value on IA-32 -- unsigned int Value on EM64T -- unsigned int Value on Itanium Architecture -- unsigned int __x86_64 Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- NA __x86_64__ Value on IA-32 -- NA Value on EM64T -- 1 Value on Itanium Architecture -- NA ANSI/ISO Macros Included with the Compiler The ANSI/ISO standard for C language requires that cer- tain predefined macros be supplied with conforming com- pilers. The Intel C++ Compiler supplies the following macros in accordance with this standard, as well as addi- tional predefined macros: __DATE__ The date of compilation as a string literal in the form Mmm dd yyyy. __FILE__ A string literal representing the name of the file being compiled. __LINE__ The current line number as a decimal constant. __STDC__ The name __STDC__ is defined when compiling a C translation unit. __STDC_HOSTED__ The __STDC_HOSTED__ macro has a value of 1. __TIME__ The time of compilation. As a string literal in the form hh:mm:ss. gcc Predefined Macros The Intel C++ Compiler includes the following predefined interoperability macros also supported by gcc: __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__ You can specify the -no-gcc option if you do not want these macros defined. If you need gcc interoperability (-cxxlib-gcc), do not use the -no-gcc compiler option. Suppress Macro Definition Use the -Uname option to suppress any macro definition currently in effect for the specified name. The -U option performs the same function as an #undef preprocessor directive. ENVIRONMENT VARIABLES You can customize your environment by setting the follow- ing environment variables. You can specify paths where the compiler can search for special files such as libraries and include files. DYLD_LIBRARY_PATH (