#ifdef for 32-bit platform

Question

In an application I maintain, we\'ve encountered a problem with file descriptor limitations affecting the stdlib. This problem only affects the 32-bit version of the standar

Answer 1

I'm not sure if there is a universal #if def that is appropriate. The C++ standard almost certainly does not define one. There are certainly platform spcefic ones though.

For example, Windows

#if _WIN64 
// 64 bit build
#else
// 32 bit build
#endif

EDIT OP mentioned this is a cross compile between Windows and Non-Windows using GCC and other compilers

There is no universal macro that can be used for all platforms and compilers. A little bit of preprocessor magic though can do the trick. Assuming you're only working on x86 and amd64 chips the following should do the trick. It can easily be expanded for other platforms though

#if _WIN64 || __amd64__
#define PORTABLE_64_BIT
#else
#define PORTABLE_32_BIT
#endif