[LLVMbugs] [Bug 23107] New: Constructor inheritance on template not working correctly

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23107

            Bug ID: 23107
           Summary: Constructor inheritance on template not working
                    correctly
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++14
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jbreitbart at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 14140
  --> https://llvm.org/bugs/attachment.cgi?id=14140&action=edit
Minimal test case

Hi,

the attached code does not compile with clang trunk (build a few days ago). It
compiles fine with g++ and my understanding is, that it is valid code (but I
may be wrong here). Here is the error message:

$ clang++ -std=c++14 constructor_inh.cpp 
constructor_inh.cpp:4:19: error: dependent using declaration resolved to type
without 'typename'
    using myBase::a;
                  ^
constructor_inh.cpp:11:19: note: in instantiation of template class 'a<double,
double>' requested here
a<double, double> b;
                  ^
constructor_inh.cpp:8:8: note: target of using declaration
struct a<int, T2> {
       ^
1 error generated.

If I add a typename to the using declaration the error message changes to 

constructor_inh.cpp:4:28: error: target of using declaration conflicts with
declaration already in scope
[...]

$ clang -v
clang version 3.7.0 (trunk 233370)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.9.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.1
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Selected multilib: .;@m64

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