C compiling on Windows and Linux ifdef switch

Question

I want to run some c   code on Linux and Windows   There are some pieces of code that I want to include only for one operating system and not the other   Is there a standard  ifdef that once can use   Something like      ifdef LINUX KEY WORD            linux code goes here     elif WINDOWS KEY WORD            windows code goes here     else     error  OS not supported      endif     The question is indeed a duplicate but the answers here are much better  especially the accepted one

User · Answer

It depends on the used compiler   For example  Windows  definition can be WIN32 or  WIN32   And Linux  definition can be UNIX or   unix   or LINUX or   linux

User · Answer

It depends on the compiler  If you compile with  say  G   on Linux and VC   on Windows  this will do     ifdef linux          elif  WIN32          else          endif

User · Answer

use    ifdef   linux          linux code goes here  elif  WIN32        windows code goes here  else   endif

User · Answer

No  these defines are compiler dependent  What you can do  use your own set of defines  and set them on the Makefile  See this thread for more info

User · Answer

You can do    if MACRO0       code     elif MACRO1       code     endif    hellip where the identifier can be         linux         Defined on Linux       sun           Defined on Solaris       FreeBSD       Defined on FreeBSD       NetBSD        Defined on NetBSD       OpenBSD       Defined on OpenBSD       APPLE         Defined on Mac OS X       hpux          Defined on HP-UX       osf           Defined on Tru64 UNIX  formerly DEC OSF1        sgi           Defined on Irix      AIX            Defined on AIX      WIN32          Defined on Windows

User · Answer

This response isn t about macro war  but producing error if no matching platform is found    ifdef LINUX KEY WORD           linux code goes here     elif WINDOWS KEY WORD            windows code goes here     else       error Platform not supported  endif   If  error is not supported  you may use static assert  C  0x  keyword  Or you may implement custom STATIC ASSERT  or just declare an array of size 0  or have switch that has duplicate cases  In short  produce error at compile time and not at runtime

User · Answer

I know it is not answer but added if someone looking same in Qt  In Qt  https   wiki qt io Get-OS-name-in-Qt  QString Get  osName      if defined Q OS ANDROID      return QLatin1String  android     elif defined Q OS BLACKBERRY      return QLatin1String  blackberry     elif defined Q OS IOS      return QLatin1String  ios     elif defined Q OS MAC      return QLatin1String  osx     elif defined Q OS WINCE      return QLatin1String  wince     elif defined Q OS WIN      return QLatin1String  windows     elif defined Q OS LINUX      return QLatin1String  linux     elif defined Q OS UNIX      return QLatin1String  unix     else     return QLatin1String  unknown     endif

[c++] C++ compiling on Windows and Linux: ifdef switch

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