代码的多平台支持

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让你的代码能够跨平台编译运行

c++

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#ifdef _WIN32
   //define something for Windows (32-bit and 64-bit, this part is common)
   #ifdef _WIN64
      //define something for Windows (64-bit only)
   #else
      //define something for Windows (32-bit only)
   #endif
#elif __APPLE__
    #include "TargetConditionals.h"
    #if TARGET_IPHONE_SIMULATOR
         // iOS Simulator
    #elif TARGET_OS_IPHONE
        // iOS device
    #elif TARGET_OS_MAC
        // Other kinds of Mac OS
    #else
    #   error "Unknown Apple platform"
    #endif
#elif __linux__
    // linux
#elif __unix__ // all unices not caught above
    // Unix
#elif defined(_POSIX_VERSION)
    // POSIX
#else
#   error "Unknown compiler"
#endif

python

判断系统信息的代码

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import platform
print(platform.system())
print(platform.release())
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from sys import platform as _platform

if _platform == "linux" or _platform == "linux2":
    # linux
elif _platform == "darwin":
    # MAC OS X
elif _platform == "win32":
    # Windows
elif _platform == "win64":
    # Windows 64-bit
else
    # others

cmake

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if(WIN32)
    aux_source_directory(os/win SOURCES)
elseif(APPLE)
    aux_source_directory(os/mac SOURCES)
else(UNIX)
    aux_source_directory(os/linux SOURCES)
endif(WIN32)

qmake

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macx {
# mac only
}
unix:!macx{
# linux only
}
win32{

}

Reference