[Bug bootstrap/51985] New: [4.7 Regression] Bootstrap failure at revision 183497 on x86_64-apple-darwin10

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51985

             Bug #: 51985
           Summary: [4.7 Regression] Bootstrap failure at revision 183497
                    on x86_64-apple-darwin10
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr


Bootstrapping revision 183497 on x86_64-apple-darwin10 fails with

libtool: link:  /opt/gcc/build_w/./gcc/xgcc -shared-libgcc
-B/opt/gcc/build_w/./gcc -nostdinc++
-L/opt/gcc/build_w/x86_64-apple-darwin10.8.0/libstdc++-v3/src
-L/opt/gcc/build_w/x86_64-apple-darwin10.8.0/libstdc++-v3/src/.libs
-B/opt/gcc/gcc4.7w/x86_64-apple-darwin10.8.0/bin/
-B/opt/gcc/gcc4.7w/x86_64-apple-darwin10.8.0/lib/ -isystem
/opt/gcc/gcc4.7w/x86_64-apple-darwin10.8.0/include -isystem
/opt/gcc/gcc4.7w/x86_64-apple-darwin10.8.0/sys-include    -dynamiclib
-Wl,-undefined -Wl,dynamic_lookup -o .libs/libstdc++.6.dylib  
-Wl,-force_load,../libsupc++/.libs/libsupc++convenience.a
-Wl,-force_load,../src/c++98/.libs/libc++98convenience.a
-Wl,-force_load,../src/c++11/.libs/libc++11convenience.a 
-L/opt/gcc/build_w/x86_64-apple-darwin10.8.0/libstdc++-v3/src
-L/opt/gcc/build_w/x86_64-apple-darwin10.8.0/libstdc++-v3/src/.libs -lm 
-Wl,-single_module -Wl,-exported_symbols_list -Wl,libstdc++-symbols.explist  
-install_name  /opt/gcc/gcc4.7w/lib/libstdc++.6.dylib -compatibility_version 7
-current_version 7.17 -Wl,-single_module
ld: duplicate symbol std::allocator<char>::allocator() in
../src/c++98/.libs/libc++98convenience.a(lt1-allocator-inst.o) and
../src/c++98/.libs/libc++98convenience.a(allocator-inst.o)
collect2: error: ld returned 1 exit status