Fun with GCC 4.8

[James Eder]

On Mon, Apr 15, 2013 at 3:58 PM, Marcus Meissner <marcus at jet.franken.de>wrote:

> On Mon, Apr 15, 2013 at 02:37:27PM -0600, James Eder wrote:
> > As many of you no doubt know,  GCC recently released 4.8.0.  This new
> > version introduces a new optimization level enabled by -Og with the
> > following description (from the man page):
> >
> > "Optimize debugging experience. -Og enables optimizations that do not
> > interfere with debugging. It should be the optimization level of choice
> for
> > the standard edit-compile-debug cycle, offering a reasonable level of
> > optimization while maintaining fast compilation and a good debugging
> > experience."
> >
> > Of course I had to try it out.  I found that building Wine lead to GCC
> > dieing with
> >
> >   ... dlls/kernel32/console.c:1691:1: internal compiler error:
> Segmentation
> > fault
> >
> > I also found
> >
> >   ... dlls/kernel32/computername.c:701:1: internal compiler error:
> > Segmentation fault
> >
> > I eventually stumbled my way into the enclosed patch which lets GCC build
> > Wine with -Og.
> >
> > I'm not sure if this change (or something similar) makes sense for Wine.
> > I'm fairly certain some changes make sense for GCC (I suspect that GCC
> > should not segfault).
> >
> > I haven't submitted a bug for GCC because I suspect they'll want me to
> > provide something simpler to compile than the Wine source tree.  I
> > certainly won't be upset if someone beats me too it.  I'm not sure how
> much
> > time in the near future I'll spend on it.  "Eventually" is probably the
> > word that fits.
> >
> > At any rate, I wanted to at least share my experiences in case anyone is
> > interested in heading down the same path.
>
> You copy and paste the failing commandline and add --save-temps, like e.g.:
>
>         gcc -c -I/home/marcus/projects/wine/dlls/kernel32 -I.
> -I/home/marcus/projects/wine/include -I../../include  -D__WINESRC__
> -D_KERNEL32_ -D_NORMALIZE_ -D_REENTRANT -fPIC -Wall -pipe
> -fno-strict-aliasing -Wdeclaration-after-statement -Wempty-body
> -Wignored-qualifiers -Wstrict-prototypes -Wtype-limits
> -Wunused-but-set-parameter -Wwrite-strings -gdwarf-2 -gstrict-dwarf
> -Wpointer-arith -Wlogical-op -I/usr/include/freetype2    -Wall  -g
> -fstack-protector  -o console.o
> /home/marcus/projects/wine/dlls/kernel32/console.c -Og --save-temps
>
> it will generate a console.i file in the currenct directory.
>
> The console.i file and above commandline are a start for the gcc bug.
>
> Ciao, Marcus
>

Looks like the bug is fixed and should be in for GCC 4.8.1.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56992

-- 
Jim
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