Gcc/10.2.0/gcc/Push 002fPop-Macro-Pragmas

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6.62.15 Push/Pop Macro Pragmas

For compatibility with Microsoft Windows compilers, GCC supports ‘#pragma push_macro("macro_name")’ and ‘#pragma pop_macro("macro_name")’.

#pragma push_macro("macro_name")

This pragma saves the value of the macro named as macro_name to the top of the stack for this macro.

#pragma pop_macro("macro_name")

This pragma sets the value of the macro named as macro_name to the value on top of the stack for this macro. If the stack for macro_name is empty, the value of the macro remains unchanged.

For example:

#define X  1
#pragma push_macro("X")
#undef X
#define X -1
#pragma pop_macro("X")
int x [X];

In this example, the definition of X as 1 is saved by #pragma push_macro and restored by #pragma pop_macro.