How to supress specific warnings in g++

Question

I want to suppress specific warnings from g++. I'm aware of the -Wno-XXX flag, but I'm looking for something more specific. I want some of the warnings in -Weffc++, but not all of them. Something like what you can do with lint - disable specific messages.

Is there a built in way in gcc to do this? Do I have to write a wrapper script?

Answer 1

Unfortunately, this feature isn't provided by g++. In VC++, you could use #pragma warning to disable some specific warnings. In gcc, the closest you can have is diagnostic pragmas, which let you enable/disable certain types of diagnostics for certain files or projects.

Answer 2

For some warnings, there is a command line switch to disable them. In order to know which switch to use, pass -fdiagnostics-show-option to gcc.

Answer 3

You could just use grep -v on the output.

Depending on the warning you wish to disable, you can sometimes correct in code. E.g.:

int main()
{
  int i;
}

Generates: foo.cc:4: warning: unused variable 'i'

Whereas this does not:

#define MARKUSED(X)  ((void)(&(X)))

int main()
{
  int i;
  MARKUSED(i);
}