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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.