[Bug c++/55028] New: _GLIBCXX_DEBUG is broken when using v7 namespace

[oleg at smolsky dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55028



             Bug #: 55028

           Summary: _GLIBCXX_DEBUG is broken when using v7 namespace

    Classification: Unclassified

           Product: gcc

           Version: 4.7.2

            Status: UNCONFIRMED

          Severity: normal

          Priority: P3

         Component: c++

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: o...@smolsky.net





I've just hit an issue when using _GLIBCXX_DEBUG together with gcc 4.7.2 built

using --enable-symvers=gnu-versioned-namespace flag. The issue is specific to

unordered_mulimap and can be reproduced using the following:



struct MyType

{

};



#if 1

using MyMap = std::multimap<std::string, MyType *>;    // works

#else

using MyMap = std::unordered_multimap<std::string, MyType *>;  // fails to link

#endif



MyMap m;

m.insert({"blah"}, new MyType});



The latter variant fails to link with the following message:



misc/libmisc.a(statmgr.o): In function

`__gnu_debug::_Safe_unordered_container_base::~_Safe_unordered_container_base()':

statmgr.cc:(.text._ZN11__gnu_debug30_Safe_unordered_container_baseD2Ev[_ZN11__gnu_debug30_Safe_unordered_container_baseD5Ev]+0x15):

undefined reference to

`__gnu_debug::_Safe_unordered_container_base::_M_detach_all()'



The compiler was configured as follows:



Configured with: ../gcc-4.7.2/configure --prefix=/opt/gcc-4.7-v7

--enable-languages=c,c++,lto --with-mpfr=/opt/gcc-4.6-rbt

--with-cloog=/opt/gcc-4.6-rbt --with-mpc=/opt/gcc-4.6-rbt

--with-gmp=/opt/gcc-4.6-rbt --with-system-zlib --disable-multilib --enable-lto

--with-build-config=bootstrap-lto --with-fpmath=sse --enable-build-with-cxx

--enable-gold=yes --enable-cloog-backend=isl --disable-cloog-version-check

--enable-symvers=gnu-versioned-namespace CFLAGS=-O3 CXXFLAGS=-O3

Thread model: posix

gcc version 4.7.2 (GCC)