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Which CPU?

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ChaoticCanuck    358
Are you referring to compiler flags?

AFAIK C/C++ does not have predefined macros for architecture, however some specific libraries implement them. may have some info you are looking for.

Really though, you want to use compiler flags to target a specific architecture.

Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 3.10.3077 for 80x86


/G3 optimize for 80386 /Gh enable _penter function call
/G4 optimize for 80486 /GH enable _pexit function call
/G5 optimize for Pentium /GR[-] enable C++ RTTI
/G6 optimize for PPro, P-II, P-III /GX[-] enable C++ EH (same as /EHsc)
/G7 optimize for Pentium 4 or Athlon /EHs enable C++ EH (no SEH exceptions)
/GB optimize for blended model (default) /EHa enable C++ EH (w/ SEH exceptions)
/Gd __cdecl calling convention /EHc extern "C" defaults to nothrow
/Gr __fastcall calling convention /GT generate fiber-safe TLS accesses
/Gz __stdcall calling convention /Gm[-] enable minimal rebuild
/GA optimize for Windows Application /GL[-] enable link-time code generation

/Gf enable string pooling /QIfdiv[-] enable Pentium FDIV fix
/GF enable read-only string pooling /QI0f[-] enable Pentium 0x0f fix
/Gy separate functions for linker /QIfist[-] use FIST instead of ftol()
/GZ Enable stack checks (/RTCs) /RTC1 Enable fast checks (/RTCsu)
/Ge force stack checking for all funcs /RTCc Convert to smaller type checks
/Gs[num] control stack checking calls /RTCs Stack Frame runtime checking
/GS enable security checks /RTCu Uninitialized local usage checks
/clr[:noAssembly] compile for the common language runtime
noAssembly - do not produce an assembly
/arch:<SSE|SSE2> minimum CPU architecture requirements, one of:
SSE - enable use of instructions available with SSE enabled CPUs
SSE2 - enable use of instructions available with SSE2 enabled CPUs

GNU gcc
Using built-in specs.
Configured with: FreeBSD/i386 system compiler
Thread model: posix
gcc version 3.4.2 [FreeBSD] 20040728

Configuration Dependent Options
M680x0 Options
-m68000 -m68020 -m68020-40 -m68030 -m68040 -m68881 -mbitfield
-mc68000 -mc68020 -mfpa -mnobitfield -mrtd -mshort -msoft-float

VAX Options
-mg -mgnu -munix

SPARC Options
-mepilogue -mfpu -mhard-float -mno-fpu -mno-epilogue
-msoft-float -msparclite -mv8 -msupersparc -mcypress

Convex Options
-margcount -mc1 -mc2 -mnoargcount

AMD29K Options
-m29000 -m29050 -mbw -mdw -mkernel-registers -mlarge -mnbw
-mnodw -msmall -mstack-check -muser-registers

M88K Options
-m88000 -m88100 -m88110 -mbig-pic -mcheck-zero-division
-mhandle-large-shift -midentify-revision
-mno-check-zero-division -mno-ocs-debug-info
-mno-ocs-frame-position -mno-optimize-arg-area
-mno-serialize-volatile -mno-underscores -mocs-debug-info
-mocs-frame-position -moptimize-arg-area -mserialize-volatile
-mshort-data-num -msvr3 -msvr4 -mtrap-large-shift
-muse-div-instruction -mversion-03.00 -mwarn-passed-structs

RS6000 Options
-mfp-in-toc -mno-fop-in-toc

RT Options
-mcall-lib-mul -mfp-arg-in-fpregs -mfp-arg-in-gregs
-mfull-fp-blocks -mhc-struct-return -min-line-mul
-mminimum-fp-blocks -mnohc-struct-return

MIPS Options
-mcpu=cpu type -mips2 -mips3 -mint64 -mlong64 -mlonglong128
-mmips-as -mgas -mrnames -mno-rnames -mgpopt -mno-gpopt -mstats
-mno-stats -mmemcpy -mno-memcpy -mno-mips-tfile -mmips-tfile
-msoft-float -mhard-float -mabicalls -mno-abicalls -mhalf-pic
-mno-half-pic -G num -nocpp

i386 Options
-m386 -m486 -mpentium -mpentiumpro -mno-486 -mcpu=cpu type
-march=cpu type -msoft-float -mrtd -mregparm -msvr3-shlib
-mno-ieee-fp -mno-fp-ret-in-387 -mfancy-math-387
-mno-wide-multiply -mdebug-addr -mno-move -mprofiler-epilogue
HPPA Options
-mpa-risc-1-0 -mpa-risc-1-1 -mkernel -mshared-libs
-mno-shared-libs -mlong-calls -mdisable-fpregs
-mdisable-indexing -mtrailing-colon

i960 Options
-mcpu-type -mnumerics -msoft-float -mleaf-procedures
-mno-leaf-procedures -mtail-call -mno-tail-call -mcomplex-addr
-mno-complex-addr -mcode-align -mno-code-align -mic-compat
-mic2.0-compat -mic3.0-compat -masm-compat -mintel-asm
-mstrict-align -mno-strict-align -mold-align -mno-old-align

DEC Alpha Options
-mfp-regs -mno-fp-regs -mno-soft-float -msoft-float

System V Options
-G -Qy -Qn -YP,paths -Ym,dir

Code Generation Options
-fcall-saved-reg -fcall-used-reg -ffixed-reg
-finhibit-size-directive -fnonnull-objects -fno-common
-fno-ident -fno-gnu-linker -fpcc-struct-return -fpic -fPIC
-freg-struct-return -fshared-data -fshort-enums -fshort-double
-fvolatile -fvolatile-global -fverbose-asm


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