Mozilla's xptcall

[Joe Marcus Clarke]

On Thu, 2003-11-20 at 15:11, mi+mx at aldan.algebra.com wrote:
> On Thu, 2003-11-20 at 14:54, mi+mx at aldan.algebra.com wrote:
> => Hello!
> => 
> => In order to build mozilla (and hence, OpenOffice) I needed the
> => attached patch. It seems, that the xptcall files are very fragile
> => to the compiler optimization, so the patch is needed to replace
> => whatever the configured through the make.conf with the vanilla
> => ``-O''. Curiously, the file being patched already contains similar
> => hacks for other platforms. Yours,
> 
> =mozilla and mozilla-devel build fine with -O2.
> 
> regxpcom usually crashes for me unless built with -O. But I'm using
> -march=pentium4 and -fomit-frame-pointer.

It's not the optimization level, but rather -march=pentium4 that causes
problems with Mozilla.  This is a known issue.

> 
> This time I went with a very elaborate:
> 
> 	-march=pentium4 -O \
> 	-fomit-frame-pointer -fbuiltin -fstrength-reduce \
> 	-fthread-jumps -funroll-loops -fcse-follow-jumps \
> 	-fcse-skip-blocks -frerun-cse-after-loop \
> 	-fexpensive-optimizations  -fschedule-insns -fschedule-insns2
> 
> Most (all?) of the rest of the code is either C or C++ and it is reasonable
> to expect the compiler to do the right thing. The directory in question,
> however, contains mostly assembly code, which is being mis-compiled with
> more agressive optimization options.

Everyone that has brought up compilation issues or crashers with Mozilla
has been pointed back to /etc/defaults/make.conf to red the section on
default CFLAGS.  However, -O2 has been tested, and does work.  There is
even an option to enable it in the Mozilla Makefiles.  However, I do not
think this was ever tested on mozilla-vendor, so you may have something
there.  In that case, this would need to be applied to OpenOffice as
they have the last remaining mozilla-vendor bits.

Joe

> 
> 	-mi
> 
-- 
PGP Key : http://www.marcuscom.com/pgp.asc


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