#pragma

This is a discussion on #pragma within the C Programming forums, part of the General Programming Boards category; what does the #pragma preprocessor command do?...

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    #pragma

    what does the #pragma preprocessor command do?

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    Registered User hk_mp5kpdw's Avatar
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    It is used to change the rules by which your code is compiled/linked. Some common directives issued are to turn off or enable warnings, change the default struct packing rules, force inclusion of libraries when linking, and enable/disable optimizations around certain code segments.
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    and the hat of wrongness Salem's Avatar
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    They're also very non-portable, being as they are specific to each compiler.

    #pragma foo
    might do very different things of different compilers.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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