[llvm-bugs] [Bug 27214] New: call to 'wcsrchr' is ambiguous

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https://llvm.org/bugs/show_bug.cgi?id=27214

            Bug ID: 27214
           Summary: call to 'wcsrchr' is ambiguous
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: radek.brich at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
    Classification: Unclassified

Hi, I've encounter an error which seems to be problem inside libc++.

When including <cwchar>, I'm getting two conflicting wcsrchr() functions, one
in std and the other in global namespace. This causes error when "using
namespace std" - see example bellow.

// wcsrchr_test.cc
#include <cwchar>

int main()
{
    const wchar_t * str = L"hello world";

    std::wcsrchr(str, 'w');  // OK
    ::wcsrchr(str, 'w');  // OK
    wcsrchr(str, 'w');  // OK

    using namespace std;
    std::wcsrchr(str, 'w');  // OK
    ::wcsrchr(str, 'w');  // OK
    wcsrchr(str, 'w');  // error: call to 'wcsrchr' is ambiguous
}


wcsrchr_test.cc:14:5: error: call to 'wcsrchr' is ambiguous
    wcsrchr(str, 'w');  // error: call to 'wcsrchr' is ambiguous
    ^~~~~~~
/usr/include/wchar.h:137:10: note: candidate function
wchar_t *wcsrchr(const wchar_t *, wchar_t);
         ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cwchar:186:49:
note: candidate function
inline _LIBCPP_INLINE_VISIBILITY const wchar_t* wcsrchr(const wchar_t* __s,
wchar_t __c) {return ::wcsrchr(__s, __c);}
                                                ^
1 error generated.

Tested on OSX 10.11.3, /usr/lib/libc++.1.dylib (compatibility version 1.0.0,
current version 120.1.0)

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