Why “pragma GCC diagnostic push” pop warning in GC

问题:

#pragma GCC diagnostic push

it pop: warning: expected [error|warning|ignored] after â#pragma GCC diagnosticâ

Why? I use GCC in Linux.

I have one question, if I can't use pop/push, if the ignore only influence the compiled cpp, not influence other cpp? if some other include the cap, if influence it?

回答1:

#pragma GCC diagnostic push and #pragma GCC diagnostic pop were added in gcc 4.6. You're using an older version.

These pragmas are typically used in conjunction with other #pragma GCC diagnostic directives to suppress, turn on, or turn into an error specific warnings for a small section of your code only. If they're ignored, the changes to warning levels will apply to the rest of the source file rather than just until the next #pragma GCC diagnostic pop. This may not be a problem, or it may be the end of the world; you'll need to understand your code to know for sure.

Either way, you should probably update your compiler. You wouldn't compile C99 with a C89 compiler; don't compile code containing pragmas for gcc 4.6 with gcc 4.4.