how to tell the compiler to avoid compiling sertion part ?

This is a discussion on how to tell the compiler to avoid compiling sertion part ? within the C Programming forums, part of the General Programming Boards category; Hello,.. im working on applet that need to work both on windows and linux the problem is that i wish ...

  1. #1
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    how to tell the compiler to avoid compiling sertion part ?

    Hello,..

    im working on applet that need to work both on windows and linux the problem is that i wish to create a single funciton that will work in diffrent ways on diffrent os .

    i thout using
    #ifdef __windows
    #include <foo4win>
    #endif __windows

    #ifdef __linux
    #include <foo4lin>
    #endif __linux

    int foo(){
    #ifdef __windows
    .
    .
    .
    #endif __windows

    ifdef __linux
    .
    .
    .
    #endif

    but i don't know what ifdef i should use (since __linux didn't compile).
    what is the proper #ifdef #endif for code for linux and windows
    why Gaos didn't had a wife ?
    http://bsh83.blogspot.com

  2. #2
    C++ Witch laserlight's Avatar
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    I find that a good approach is to define different files for platform dependent code. You then instruct your build tool to build according to the platform.
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  3. #3
    Kernel hacker
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    Are you asking what the compiler provides as a prefdefined value for the OS? That is not strictly defined by any standard, but gcc is normally using the __linux__ form.

    In windows with a Microsoft compiler, you can use "_WIN32", but I'm not sure if that's supported by gcc.

    --
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  4. #4
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    thnx this is what im asking for ..

    ill check the __winr32
    why Gaos didn't had a wife ?
    http://bsh83.blogspot.com

  5. #5
    and the hat of sweating
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    Code:
    #include <blah blah.h>
    ...
    // Code that is platform independent...
    
    #if defined( WIN32 )
       // Put Windows specific code here.
    #elif defined( UNIX )
       // Put UNIX specific code here.
    #elif defined( SOMETHINGELSE )
       // Put code for other OS's in other #elif blocks...
    #endif

  6. #6
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    Thank to all .
    why Gaos didn't had a wife ?
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  7. #7
    Woof, woof! zacs7's Avatar
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    To "fix" how different compilers define different constants for different OSes, use a couple of "ifs"

    eg,
    Code:
    #if defined(_WIN32) || defined(WIN32) || defined(__windows)
    #undef WIN32
    #define WIN32
    #endif
    Or whatever.

  8. #8
    Frequently Quite Prolix dwks's Avatar
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    Many UNIX compilers define the preprocessor directive unix, though not in ANSI mode since in that case constants have to start with _X or __x.
    dwk

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  9. #9
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    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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