[Bug corefiles/12823] New: physname: discrepancies between DW_AT_name and demangler

["jan.kratochvil at redhat dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12823

           Summary: physname: discrepancies between DW_AT_name and
                    demangler
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: corefiles
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jan.kratochvil@redhat.com
                CC: keiths@redhat.com
            Target: x86_64-fedora14-linux-gnu


DMGL_VERBOSE:  nm -C does not use DMGL_VERBOSE:
libstdc++.so.6.0.16.debug
00000000000a4e50 t bool __gnu_cxx::operator==<char*,
std::string>(__gnu_cxx::__normal_iterator<char*, std::string> const&,
__gnu_cxx::__normal_iterator<char*, std::string> const&)

But the DIE uses "DMGL_VERBOSE":
 <2><1836e2>: Abbrev Number: 29 (DW_TAG_subprogram)
    <1836e4>   DW_AT_name        : (indirect string, offset: 0x2e3f0):
operator==<char*, std::basic_string<char> >
 <1><188ab4>: Abbrev Number: 103 (DW_TAG_subprogram)
    <188ab5>   DW_AT_specification: <0x1836e2>
 <1><193100>: Abbrev Number: 129 (DW_TAG_subprogram)
    <193102>   DW_AT_abstract_origin: <0x188ab4>
    <193106>   DW_AT_low_pc      : 0xa4e50

Therefore physname is then:
__gnu_cxx::operator==<char*, std::basic_string<char>
>(__gnu_cxx::__normal_iterator<char*, std::basic_string<char,
std::char_traits<char>, std::allocator<char> > > const&,
__gnu_cxx::__normal_iterator<char*, std::basic_string<char,
std::char_traits<char>, std::allocator<char> > > const&)

and physname does not match the ELF symbol (as symbol_find_demangled_name
during elfread.c does not use DMGL_VERBOSE like nm -C does not).

I do not say if DMGL_VERBOSE yes or no (and so whether to patch nm.c etc.) but
it needs to be in sync, for a symbol from nm -C:

(gdb) break '__gnu_cxx::operator==<char*,
std::string>(__gnu_cxx::__normal_iterator<char*, std::string> const&,
__gnu_cxx::__normal_iterator<char*, std::string> const&)'
Function "__gnu_cxx::operator==<char*,
std::string>(__gnu_cxx::__normal_iterator<char*, std::string> const&,
__gnu_cxx::__normal_iterator<char*, std::string> const&)" not defined.

GCC DW_AT_name discussed at:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49130#c6

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