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Re: gcc-3.4-20050401 BUG? generates illegal instruction inX11R6.4.2/mkfontscale/freetypemacro (worksforme)
- From: Roland Mainz <roland dot mainz at nrubsig dot org>
- To: Clemens Koller <clemens dot koller at anagramm dot de>
- Cc: gcc at gcc dot gnu dot org, xorg at lists dot freedesktop dot org
- Date: Tue, 12 Apr 2005 04:08:17 +0200
- Subject: Re: gcc-3.4-20050401 BUG? generates illegal instruction inX11R6.4.2/mkfontscale/freetypemacro (worksforme)
- References: <42546B09.6080608@kegel.com> <425529FF.8040504@anagramm.de> <425A67C0.6010803@anagramm.de>
Clemens Koller wrote:
> In the freetype-devel list, I got some suggestions:
> This bug/problem seems to concentrate on ppc32/64 and s390 architectures.
> Basically all Type1 fonts shipped with X11 are suspect to this
> problem. I made tests agains UTBI____.pfa
>
> The possible (temporary)fix:
> If I re-compile freetype with -fno-strict-aliasing I can get
> mkfontscale to work!
> It's still not clear whether this is a problem in freetype
> (2.1.7 to 2.1.9 at least), the macros there, or in gcc.
1. Could you please file a bug at https://bugs.freedesktop.org/ and post
the bugid back here ?
2. Can you test the attached patch
(xorg_gcc_strict_aliasing_crasher_fix001.gudiff.txt) and check whether
this fixes the problem (please make sure to use the libfreetype library
build in the xc/ tree or link FreeType2 statically) ?
----
Bye,
Roland
--
__ . . __
(o.\ \/ /.o) roland.mainz@nrubsig.org
\__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer
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(;O/ \/ \O;)
Index: xc/config/cf/xorg.cf
===================================================================
RCS file: /cvs/xorg/xc/config/cf/xorg.cf,v
retrieving revision 1.45
diff -u -2 -0 -r1.45 xorg.cf
--- xc/config/cf/xorg.cf 1 Feb 2005 02:02:31 -0000 1.45
+++ xc/config/cf/xorg.cf 12 Apr 2005 02:03:39 -0000
@@ -1524,41 +1524,46 @@
# else
# define DefaultCCOptions -ansi -pedantic GccWarningOptions
# endif
# endif
# if defined(UseInstalled)
# ifndef UseGccMakeDepend
# define UseGccMakeDepend YES
# endif
# endif
#endif
/* Make imake noisier. Note that this is ineffective for 3.0 <= GCC <= 3.2 */
#ifndef ImakeWarningFlags
# ifdef Gcc28Warnings
# define ImakeWarningFlags Gcc28Warnings
# else
# define ImakeWarningFlags /* */
# endif
#endif
-#if ((GccMajorVersion == 3) && (GccMinorVersion >= 1)) || (GccMajorVersion > 3)
+/* PPC and S390(x) always need -fno-strict-aliasing to avoid crash in in
+ * Freetype code and some other locations */
+#if (((GccMajorVersion == 3) && (GccMinorVersion >= 1)) || (GccMajorVersion > 3)) \
+ || defined (PpcArchitecture) \
+ || defined (s390Architecture) \
+ || defined (s390xArchitecture)
# define GccAliasingArgs -fno-strict-aliasing
#else
# define GccAliasingArgs /* */
#endif
#if HasGcc2 && defined(i386Architecture)
# ifndef DefaultGcc2i386Opt
# define DefaultGcc2i386Opt -O2 -fno-strength-reduce GccAliasingArgs
# endif
#endif
#if HasGcc2 && defined(AMD64Architecture)
# ifndef DefaultGcc2AMD64Opt
# define DefaultGcc2AMD64Opt -O2 -fno-strength-reduce GccAliasingArgs
# endif
#endif
#if HasGcc2 && defined(AlphaArchitecture)
# ifndef DefaultGcc2AxpOpt
# define DefaultGcc2AxpOpt -O2 GccAliasingArgs