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[Bug c/66673] Wsequence-point warning missing when swapping variables via chained xor
- From: "manu at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 25 Jun 2015 20:26:19 +0000
- Subject: [Bug c/66673] Wsequence-point warning missing when swapping variables via chained xor
- Auto-submitted: auto-generated
- References: <bug-66673-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66673
Manuel LÃpez-IbÃÃez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
--- Comment #9 from Manuel LÃpez-IbÃÃez <manu at gcc dot gnu.org> ---
Ops, this may have been added recently, it does warn with my GCC 6 build:
test.c:2:6: warning: operation on â*aâ may be undefined [-Wsequence-point]
*a ^= *b ^= *a ^= *b;
^
test.c:9:5: warning: operation on âaâ may be undefined [-Wsequence-point]
a ^= b ^= a ^= b;
^
Oh, well, then this is INVALID. Sorry for the noise.