* Namhyung Kim <namhy...@kernel.org> wrote:

> > diff --git a/tools/perf/config/feature-checks/test-on-exit.c 
> > b/tools/perf/config/feature-checks/test-on-exit.c
> > new file mode 100644
> > index 0000000..473f1de
> > --- /dev/null
> > +++ b/tools/perf/config/feature-checks/test-on-exit.c
> > @@ -0,0 +1,6 @@
> > +#include <stdio.h>
> > +
> > +int main(void)
> > +{
> > +   return on_exit(NULL, NULL);
> > +}
> 
> Just a nitpick.  The manpage says the on_exit() requires <stdlib.h> 
> header rather than <stdio.h> and _BSD_SOURCE or _SVID_SOURCE defined. So 
> I think we can define _GNU_SOURCE before the header file or pass it 
> through make command line - it'd probably be better for synthesized 
> test-all.c checking.

This was inherited from the original feature-tests.mak:

define SOURCE_ON_EXIT
#include <stdio.h>

int main(void)
{
        return on_exit(NULL, NULL);
}
endef

So it appears to work in practice, but yes, I agree that this could be 
cleaned up.

Thanks,

        Ingo
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