[Bug libstdc++/64103] New: conflicting definitions in parallel/algo.h and algorithmfwd.h

[doko at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64103

            Bug ID: 64103
           Summary: conflicting definitions in parallel/algo.h and
                    algorithmfwd.h
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at gcc dot gnu.org

[forwarded from https://bugs.debian.org/770843]

the bug reporter mentions this is accepted by g++, but not by clang++ (using
libstdc++), giving the following error message:

In file included from
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/c++/4.9/parallel/algorithm:37:
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/c++/4.9/parallel/algo.h:2207:53:
error: redefinition of default argument
                       __gnu_parallel::_Parallelism __parallelism_tag
                                                    ^
/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../include/c++/4.9/parallel/algorithmfwd.h:552:36:
note: previous definition is here
      __gnu_parallel::_Parallelism __parallelism