[Bug c++/42036] New: libstdc++ seems to miss std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string<char*>(char*, char*, std::allocator<char> const&)

["hubicka at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Hi,
compiling tramp3d with -fwhole-program leads to:
/home/jh/gcc-install/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/../../../../lib64/libstdc++.a(sstream-inst.o):
In function `std::basic_stringbuf<char, std::char_traits<char>,
std::allocator<char> >::str() const':
/home/jh/trunk/build5/x86_64-unknown-linux-gnu/libstdc++-v3/include/sstream:129:
undefined reference to `std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string<char*>(char*, char*, std::allocator<char>
const&)'
/home/jh/trunk/build5/x86_64-unknown-linux-gnu/libstdc++-v3/include/sstream:127:
undefined reference to `std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string<char*>(char*, char*, std::allocator<char>
const&)'
/home/jh/trunk/build5/x86_64-unknown-linux-gnu/libstdc++-v3/include/sstream:129:
undefined reference to `std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string<char*>(char*, char*, std::allocator<char>
const&)'
/home/jh/trunk/build5/x86_64-unknown-linux-gnu/libstdc++-v3/include/sstream:127:
undefined reference to `std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string<char*>(char*, char*, std::allocator<char>
const&)'
/home/jh/trunk/build5/x86_64-unknown-linux-gnu/libstdc++-v3/include/sstream:129:
undefined reference to `std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string<char*>(char*, char*, std::allocator<char>
const&)'
/home/jh/gcc-install/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/../../../../lib64/libstdc++.a(sstream-inst.o):/home/jh/trunk/build5/x86_64-unknown-linux-gnu/libstdc++-v3/include/sstream:127:
more undefined references to `std::basic_string<char, std::char_traits<char>,
std::allocator<char> >::basic_string<char*>(char*, char*, std::allocator<char>
const&)' follow

I suppose this is because normally tramp3d exports the function as comdat and
as a result of -fwhole-program we bring it local (since we know address is not
taken and making it local enable more optimization) while libstdc++ reference
the function but does not provide COMDAT version of it.

I think this is not valid, or is this C++ ABI feature?


-- 
           Summary: libstdc++ seems to miss std::basic_string<char,
                    std::char_traits<char>, std::allocator<char>
                    >::basic_string<char*>(char*, char*,
                    std::allocator<char> const&)
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hubicka at gcc dot gnu dot org
  GCC host triplet: x86_64-linux
GCC target triplet: x86_64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42036