How to suppress GCC warnings from library headers?

user_227160 0
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I have a project that uses log4cxx, boost, etc. libraries whose headers generate lots of (repetitive) warnings. Is there a way to suppress warnings from library includes (i.e. #include <some-header.h>) or includes from certain paths? I'd like to use -Wall and/or -Wextra as usual on project code without relevant info being obscured. I currently use grep on make output but I'd like something better.

gcc-warning gcc warnings suppress-warnings
10 Answers

You may try to include library headers using -isystem instead of -I. This will make them "system headers" and GCC won't report warnings for them.

user_2312250

I found the trick. For library includes, instead of -Idir use -isystem dir in the makefile. GCC then treats boost etc. as system includes and ignores any warnings from them.

user_2271600

Putting the following

#pragma GCC system_header

will turn off GCC warnings for all following code in this file.

user_2971310

Another way to do it is, in the makefile, to tell the compiler to ignore warnings for the specific folder:

$(BUILD_DIR)/libs/%.c.o: CFLAGS += -w
user_83193100
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