[llvm-bugs] [Bug 35689] New: Clang disagrees with GCC about abi:cxx11 for templated member functions.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35689

            Bug ID: 35689
           Summary: Clang disagrees with GCC about abi:cxx11 for templated
                    member functions.
           Product: clang
           Version: 4.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jeremysalwen at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

Created attachment 19578
  --> https://bugs.llvm.org/attachment.cgi?id=19578&action=edit
Program demonstrating the disagreement.

I have attached a minimized test case of the bug I am encountering, where g++
(5.4.0) and clang (-3.8, 3.9, 4.0) disagree on whether a function is given
[abi:cxx11] mangling.

Steps to reproduce:

$ g++ -std=c++11 -O1 main.cpp -c -o foo.o
$ objdump --syms /tmp/foo2.o  | c++filt | grep bar
0000000000000000 l    d  .text._ZNK3fooIiE3barEPKcS2_   0000000000000000
.text._ZNK3fooIiE3barEPKcS2_
0000000000000000  w    F .text._ZNK3fooIiE3barEPKcS2_   0000000000000017
foo<int>::bar(char const*, char const*) const

$ clang++-4.0 -std=c++11 -O1 main.cpp -c -o foo2.o
$ objdump --syms /tmp/foo2.o  | c++filt | grep bar
0000000000000000 l    d  .text._ZNK3fooIiE3barB5cxx11EPKcS2_   
0000000000000000 .text._ZNK3fooIiE3barB5cxx11EPKcS2_
0000000000000000  w    F .text._ZNK3fooIiE3barB5cxx11EPKcS2_   
0000000000000048 foo<int>::bar[abi:cxx11](char const*, char const*) const

Note that Clang thinks the function bar is cxx11 abi, while gcc does not. This
causes linking failures.

This bug was reduced from a boost::regex linking failure discussed here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=823978

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