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6.62.14 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.

+

+ © Free Software Foundation
Licensed under the GNU Free Documentation License, Version 1.3.
+ https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/Push_002fPop-Macro-Pragmas.html +

+
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