[llvm-bugs] [Bug 28099] New: clang rejects valid C++11 code with decltype

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28099

            Bug ID: 28099
           Summary: clang rejects valid C++11 code with decltype
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: su at cs.ucdavis.edu
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The current clang trunk rejects the following valid C++11 test case (which is
accepted by GCC) on x86_64-linux-gnu in both 32-bit and 64-bit modes. 


$ clang++ -v    
clang version 3.9.0 (trunk 272507)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/5.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$ 
$ g++-6.1 -std=c++11 -c -Wall -Wextra -pedantic small.cpp
$ 
$ clang++ -std=c++11 -c small.cpp
small.cpp:7:22: error: 'decltype' cannot be used to name a declaration
int decltype (A ())::i = 100;
    ~~~~~~~~         ^
1 error generated.
$ 


-------------------------------------


class A 
{
  static int i;
};

//okay: int A::i = 100; 
int decltype (A ())::i = 100;

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