[gs-cvs] rev 7671 - trunk/gs/src

[giles at ghostscript.com]

Author: giles
Date: 2007-02-02 12:29:28 -0800 (Fri, 02 Feb 2007)
New Revision: 7671

Modified:
   trunk/gs/src/configure.ac
Log:
Turn off the strict aliasing warnings in the autoconf gcc build.

Details:

This is slightly dangerous because it can flag real problems the 
optimizer will trip over. However, Ghostscript's method of implementing 
inheritance through macro expansion in structure definitions generates 
hundreds of (not problematic) warnings because the compiler doesn't 
actually trace through to verify that the referenced members are at the 
same offset.

We cannot fix this easily without making the code much more convoluted, 
so in the interests of noticing and fixing other warnings, we've decided
to turn off this particular check.


Modified: trunk/gs/src/configure.ac
===================================================================
--- trunk/gs/src/configure.ac	2007-02-02 18:54:09 UTC (rev 7670)
+++ trunk/gs/src/configure.ac	2007-02-02 20:29:28 UTC (rev 7671)
@@ -44,8 +44,8 @@
 
 if test $ac_cv_prog_gcc = yes; then
     cflags_to_try="-Wall -Wstrict-prototypes \
--Wmissing-declarations -Wmissing-prototypes \
--Wwrite-strings \
+-Wmissing-declarations -Wmissing-prototypes -Wwrite-strings \
+-Wno-strict-aliasing \
 -fno-builtin -fno-common"
     optflags_to_try="-O2"
 else