[llvm-bugs] [Bug 27443] New: [CWG 734] Nonconforming aliasing of block scope objects

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Apr 20 19:08:22 PDT 2016


            Bug ID: 27443
           Summary: [CWG 734] Nonconforming aliasing of block scope
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: frankhb1989 at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified


// clang++ -std=c++14 -O0 -pedantic-errors
#include <cstdlib>

void foo(const int* p = {})
    const int a[] = {1, 2, 3, 4};
    if(p == a)

int main()

As per [intro.object]/5, 'std::abort' should not be called. The rule is
introduced by resolution of CWG 734 and applicable here, though the title of
that issue is about "namespace-scope variables".

However, The program compiled by clang++ with will abort while g++ works well.

The C compilers have similar issues. Not sure for the requirements from ISO C.

Related discussion: https://gcc.gnu.org/ml/gcc/2016-04/msg00178.html

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