On 05/25/2011 01:23 AM, Voelker, Bernhard wrote: > Hi *, > > building coreutils-8.12 with '--enable-gcc-warnings' fails on my SLES 10.3 > server: > > CC uinttostr.o > cc1: warnings being treated as errors > In file included from uinttostr.c:3: > anytostr.c: In function 'uinttostr': > anytostr.c:39: warning: comparison of unsigned expression < 0 is always false
It would be _really_ nice if there were a way to have gcc shut up that particular warning when it is the result of a macro expansion that first checks whether an expresssion is signed or unsigned. That is, gcc is issuing the warning for 'is_signed(e) ? (e < 0 ? a : b) : b', even though the 'e < 0' sub-expression is provably dead code for an unsigned expression and therefore the warning is spurious. But we don't know how to shut up gcc. This also affects recent gnulib lib/intprops.h, so ideas are welcome. In the meantime, configure with CFLAGS='-Wno-error' to allow warnings to still be listed but not halt compilation. -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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