How to write pragmas in C

I know th开发者_StackOverflowat #pragmas are compiler directives which are used to provide additional information to the compiler. My question is that, I need to write some #pragmas for my project. i.e, I need to invoke some particular code when there are some particular pattern in code. Can some one throw light on this ...?

Thanks in advance..!

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You can't write your own #pragmas. You must look into your compiler's handbook for which #pragmas are supported.

Alternatively, if your compiler allows you to modify its source code (license- and sourcecode-wise), you might hack some new ones in. Don't expect it to be a trivial task, there's usually no enduser-friendly plug-in write-your-own-pragmas system.

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#pragma is a way for compiler vendors to legally implement proprietary extensions. They are hard-coded into the compiler. (And IIRC compilers are required to ignore unknown pragmas.)

Unless you write your own compiler, you cannot create your own pragmas.