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There's no inter-compiler standard, but each compiler tends to be quite consistent. You can build a header for yourself that's something like this:

#if MSVC#ifdef _M_X86#define ARCH_X86#endif#endif#if GCC#ifdef __i386__#define ARCH_X86#endif#endif

There's not much point to a comprehensive list, because there are thousands of compilers but only 3-4 in widespread use (Microsoft C++, GCC, Intel CC, maybe TenDRA?). Just decide which compilers your application will support, list their #defines, and update your header as needed.