ARM Compiler toolchain v4.1 for µVision Using the Compiler

Compiler Coding Practices
5.73 _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, and _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"
5.73.1 See also
Concepts
• New language features of C99 on page 5-77.
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