编译器的选择（x86_amd64, amd64等的区别）

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x86 on x86Allows you to create output files for x86 machines. This version of cl.exe runs as a 32-bit process, native on an x86 machine and under WOW64 on a 64-bit Widows operating system.
Itanium on x86 (Itanium cross-compiler)
Allows you to create output files for Itanium. This version of cl.exe runs as a 32-bit process, native on an x86 machine and under WOW64 on a 64-bit Widows operating system.
x64 on x86 (x64 cross-compiler)Allows you to create output files for x64. This version of cl.exe runs as a 32-bit process, native on an x86 machine and under WOW64 on a 64-bit Widows operating system.
Itanium on ItaniumAllows you to create output files for Itanium. This version of cl.exe runs as a native process on an Itanium machine.
x64 on x64Allows you to create output files for x64. This version of cl.exe runs as a native process on an x64 machine.
  Vcvarsall.bat argument  Compiler  Host (either natively or using emulation)  Target architecture  “x86” (default)  32-bit Native  x86, x64, Itanium  x86  “x86_amd64”  x64 Cross  X86, x64, Itanium  x64  “x86_IPF”  Itanium Cross  X86, x64, Itanium  Itanium  “amd64”  x64 Native  x64  x64  “IPF” or “itanium”  Itanium Native  Itanium  Itanium