[LLVMbugs] [Bug 21045] New: Built-in __is_constructible interferes with definition of struct __is_constructible {};

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21045

            Bug ID: 21045
           Summary: Built-in __is_constructible interferes with definition
                    of struct __is_constructible {};
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: stephan.bergmann.secondary at googlemail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

> $ clang++ --version
> clang version 3.6.0 (trunk 218328)
> Target: x86_64-apple-darwin13.4.0
> Thread model: posix
>
> $ cat test.cc
> struct __is_constructible {};
>
> $ clang++ -c test.cc
> test.cc:1:1: error: declaration of anonymous struct must be a definition
> struct __is_constructible {};
> ^
> test.cc:1:1: warning: declaration does not declare anything [-Wmissing-declarations]
> struct __is_constructible {};
> ^
> 1 warning and 1 error generated.

(This breaks inclusion of
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/type_traits
on Mac OS X in C++11 mode, which happens to define a struct template named
__is_constructible.)

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