Re: [ft-devel] ftjam segfault building with GCC 4.2

[David Turner]

Hello Ryan and all,

I just released a second release candidate for FT-Jam 2.5.3
that contains a fix for these aliasing issues. It's available
from:

  http://david.freetype.org/jam/

be sure to get 2.5.3rc2 packages, not previous versions

note that I hope to make it a real release soon, testing on OS/2
and VMS is still needed though

Cheers,

- David

On Sat, 09 Jun 2007 13:59:54 -0600, "Ryan Hill" <address@hidden> said:
> Building ftjam with GCC 4.2 using -O2 optimizations fails with a
> segfault in jam0.  This is caused by a violation of strict-aliasing
> rules which GCC 4.2 assumes are followed with optimization levels of -O2
> and above.  It can be worked around with -fno-strict-aliasing.  All jam
> implementations appear to be affected, including Perforce jam, ftjam,
> and Boost.Jam.
> 
> 
> gcc -o jam0 -O2 -march=native -pipe -Wstrict-aliasing  builtins.c
> command.c compile.c execnt.c execunix.c execvms.c expand.c filent.c
> fileos2.c fileunix.c filevms.c glob.c hash.c hdrmacro.c headers.c jam.c
> jambase.c jamgram.c lists.c make.c make1.c newstr.c option.c parse.c
> pathunix.c pathvms.c regexp.c rules.c scan.c search.c timestamp.c
> variable.c
> execunix.c: In function 'execcmd':
> execunix.c:235: warning: incompatible implicit declaration of built-in
> function '_exit'
> hdrmacro.c: In function 'macro_headers':
> hdrmacro.c:110: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> hdrmacro.c: In function 'macro_header_get':
> hdrmacro.c:133: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> newstr.c: In function 'newstr':
> newstr.c:52: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> rules.c: In function 'bindrule':
> rules.c:62: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> rules.c: In function 'bindtarget':
> rules.c:89: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> timestamp.c: In function 'timestamp':
> timestamp.c:90: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> timestamp.c:116: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> timestamp.c:141: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> timestamp.c: In function 'time_enter':
> timestamp.c:187: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> variable.c: In function 'var_get':
> variable.c:235: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> variable.c: In function 'var_enter':
> variable.c:327: warning: dereferencing type-punned pointer will break
> strict-aliasing rules
> chmod a+w jambase.c
> ./jam0
> make: *** [all] Segmentation fault
> 
> 
> -- 
> dirtyepic                 salesman said this vacuum's guaranteed
>  gentoo org          it could suck an ancient virus from the sea
>   9B81 6C9F E791 83BB 3AB3  5B2D E625 A073 8379 37E8 (0x837937E8)
> 
> 
> 
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