[LLVMbugs] [Bug 24254] New: No diagnostic for mismatch between const and constexpr

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24254

            Bug ID: 24254
           Summary: No diagnostic for mismatch between const and constexpr
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dnovillo at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Given these mismatched declarations:

extern const char kAbc[];
constexpr char kAbc[] = "abc";

Clang (trunk as of today) compiles this code with no errors:

$ clang++ -c foo.cc -std=c++11

But GCC 4.8 gives the following error:

$ g++ -std=c++11 -c foo.cc
foo.cc:2:21: error: redeclaration 'kAbc' differs in 'constexpr'
 constexpr char kAbc[] = "abc";
                     ^
foo.cc:1:19: error: from previous declaration 'kAbc'
 extern const char kAbc[];
                   ^

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