[Bug debug/48703] New: segfault in canonicalize_for_substitution

[matz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48703

           Summary: segfault in canonicalize_for_substitution
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: matz@gcc.gnu.org


Created attachment 24062
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24062
testcase

The patch for PR48207 broke compiling any moderately complex C++ program with
-g -flto.  We can't use the C++ specific langhook for mangling when we've
already cleared out language specific stuff in free_lang_data.

$ cc1plus -g -flto bug.ii
/matz/gcc/svn/real-trunk/dev/x86_64-unknown-linux-gnu/libstdc++-v3/include/istream:
In instantiation of ‘std::basic_istream<_CharT, _Traits>::sentry::operator
bool() const [with _CharT = wchar_t, _Traits = std::char_traits<wchar_t>]’:
EtherAppCli.cc:221:1:   instantiated from here
/matz/gcc/svn/real-trunk/dev/x86_64-unknown-linux-gnu/libstdc++-v3/include/istream:686:7:
internal compiler error: Segmentation fault