[LLVMbugs] [Bug 16467] New: no warning on undefined behaviour

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Jun 26 13:57:07 PDT 2013


            Bug ID: 16467
           Summary: no warning on undefined behaviour
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rdivacky at freebsd.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

liska ~$ cat hello.c
int main(int argc, char **argv)
  int i = 7;

  return i = ++ i;
liska ~$ gcc49 -Wall hello.c
hello.c: In function 'main':
hello.c:5:12: warning: operation on 'i' may be undefined [-Wsequence-point]
   return i = ++ i;
liska ~$ clang-3.4 -Wall hello.c

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