[Bug libstdc++/59247] New: Bootstrap fails due to errors in libstdc++ sources with `--enable-symvers=gnu-versioned-namespace'

[ai.azuma at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59247

            Bug ID: 59247
           Summary: Bootstrap fails due to errors in libstdc++ sources
                    with `--enable-symvers=gnu-versioned-namespace'
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ai.azuma at gmail dot com

I have come across errors in stage 1 build of libstdc++ when trying to build
GCC 4.9-20131117 with the following commands on an x86_64-unknown-linux-gnu
machine:

  $ $SRCDIR/configure --enable-languages=c,c++
--enable-symvers=gnu-versioned-namespace
  $ make

Bootstrap succeeds when `--enable-symvers=gnu-versioned-namespace' is unset.

GCC 4.7-20131116 and 4.8-20131107 can be built successfully with the option,
thus this seems a regression.