[LLVMbugs] [Bug 14528] New: constexpr literal string gets warning about deprecated string conversions

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14528

             Bug #: 14528
           Summary: constexpr literal string gets warning about deprecated
                    string conversions
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++11
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: cliffy+llvm.bugs at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


A definition that looks like:

    constexpr char *text = "...";

causes the deprecated-writable-strings warning:

    cstring.cpp:32:35: warning: conversion from string literal to 'char *const'
is deprecated
          [-Wdeprecated-writable-strings]

The workaround is to say both constexpr and const: 

    constexpr const char *text = "...";

Section 7.1.5 of the standard, paragraph 9 says: "A constexpr specifier used in
an object declaration declares the object as const."  So I think that
"constexpr" should suffice in this case.

If it's any consolation, GCC 4.7.2 gives a similar warning.

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