[Bug c++/51884] New: ICE with c++11 thread and templates

["bluescarni at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51884

             Bug #: 51884
           Summary: ICE with c++11 thread and templates
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: bluescarni@gmail.com


Created attachment 26354
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=26354
Code snippet demonstrating the issue.

The attached minimal code snippet causes an ICE on g++-4.5.3, g++-4.6.2 and
g++-4.7.0-alpha20111231. The compilation command is:

g++ -std=c++0x bug.cpp

The output on 4.5:

In file included from bug.cpp:1:0:

/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.3/include/g++-v4/thread:112:7: internal
compiler error: in dfs_walk_once, at cp/search.c:1645

The output on 4.6:

In file included from bug.cpp:1:0:

/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.2/include/g++-v4/thread:109:14: internal
compiler error: in dfs_walk_once, at cp/search.c:1659

The output on 4.7:

â
In file included from bug.cpp:1:0:
in dfs_walk_once, at cp/search.c:1695

The ICE is avoided at least in these cases:

- replace the method bar() with a non-templated version,
- replace the std::enable_if<...> enabler with void.