[Bug c/48088] -Werror=frame-larger-than=100 does not work as expected

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48088

--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2011-03-15 09:20:47 UTC ---
(In reply to comment #3)
> (In reply to comment #2)
> > Yeah.  Confirmed.
> > 
> > You need -Wframe-larger-than=500 -Werror=frame-larger-than which hopefully
> > doesn't reset the value to 1.
> 
> It doesn't, but not for the reason you would hope.  8-)

These are indeed several bugs related to not handling W options with parameters
properly. Check in options.c (enable_warning_as_error) for how -Werror=option
is handled and...

> /tmp/x.c:3:1: error: the frame size of 32 bytes is larger than 1 bytes
> [-Werror=frame-larger-than=]

diagnostics.c for how this is printed. This should print
-Werror=frame-larger-than=1 (without -Werror, does it print
[-Wframe-larger-than=1]) ?

I guess similar problems arise with Wlarger-than=, Woverflow= and
Wstrict-aliasing= (but perhaps the two latter are handled differently).

Fixing it should be fairly trivial.