Re: Package segfaults when built with -O2 but not with -O0
Andrew Haley <aph(a)redhat.com> writes:
On 11/18/2011 05:53 PM, Ralf Corsepius wrote:
> pptp.c:459:33: warning: dereferencing type-punned pointer might break
> strict-aliasing rules [-Wstrict-aliasing]
Bingo! Bugs like this must be fixed.
Sometimes that's easier said than done. -fno-strict-aliasing might be
your friend.
-fwrapv is another good tool for keeping the compiler from breaking
traditional understandings of C semantics.
regards, tom lane