[llvm-bugs] [Bug 31816] New: Clang-CL diagnoses ternary ambiguity which cl.exe allows

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jan 31 07:12:53 PST 2017


            Bug ID: 31816
           Summary: Clang-CL diagnoses ternary ambiguity which cl.exe
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: steveire at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified


    struct MyBool
        MyBool(bool b = false) {}
        operator bool() const { return false; }

    int main()
        MyBool mb;
        bool result = true ? false : mb;
        return 0;

C:\dev\tmp>cl /c main.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24325.6 for x86
Copyright (C) Microsoft Corporation.  All rights reserved.


C:\dev\tmp>"c:\dev\src\llvm\build\Release\msbuild-bin\cl.exe" /c main.cpp
main.cpp(11,21):  error: conditional expression is ambiguous; 'bool' can be
converted to 'MyBool' and vice versa
        bool result = true ? false : mb;
                           ^ ~~~~~   ~~
1 error generated.

It could be considered to match the behavior of cl.exe

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