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In C/C++ code I try to port, a deprecated system header is included:
From the header:
#ifdef __GNUC__
#warning "this header is deprecated"
#endif
As we compile here with gcc -Wall -Werror, compilation stops.
In the long run, replacing the use of deprecated functions is best, but for now I want to disable just this warning.
Compiling without -Werror of course works, but as this is part of a completely automated build process, I prefer not to do that.
Including the header with #undefing __GNUC__ before and #defineing it afterwards is a possibility, but I'm worried of the side effects inside the included header.
Is there a way to either disable #warning or relax -Werror just for one header?
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You can do this with a (GCC specific) diagnostic pragma
If you surround the include with the following it will disable any warnings caused by #warning.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcpp"
#include "header.h"
#pragma GCC diagnostic pop
Note that if you change the ignored to warning in the above the compiler still prints the warnings - it just doesn't act on the -Werror flag for them.
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