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_Pragma preprocessing operator in C99

C90 does not permit a #pragma directive to be produced as the result of a macro expansion. However, the C99 _Pragma operator enables you to embed a preprocessor macro in a pragma directive.

_Pragma is permitted in C90 if --strict is not specified.

For example:

# define RWDATA(X) PRAGMA(arm section rwdata=#X)
# define PRAGMA(X) _Pragma(#X)
RWDATA(foo)  // same as #pragma arm section rwdata="foo"
int y = 1;   // y is placed in section "foo"
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