Re: attribute warn_unused_result

[Tom Tromey]

Eli> Except that this page says -D_FORTIFY_SOURCE=2 is in effect with -O2
Eli> or higher, but I also see the warning with -O1.  Only -O0 disables it.

I think that page is probably wrong.

In my libc's features.h, I see:

#if defined _FORTIFY_SOURCE && _FORTIFY_SOURCE > 0 \
    && defined __OPTIMIZE__ && __OPTIMIZE__ > 0
[...]

__OPTIMIZE__ is set to 1 if any optimization level > 0 is used.  I don't
think headers can distinguish the levels.  It could probably be done in
GCC specs, but I didn't look to see if the Ubuntu change attempts this.

Tom