Several "warning: cannot export hidden symbol" during x86_64-apple-darwin10 bootstrap

[Dominique Dhumieres]

Paolo,

While chasing bootstrap failures on Darwin, I did notice the following
(harmless) warnings:

ld: warning: cannot export hidden symbol std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::~basic_stringbuf() from .libs/complex_io.o
ld: warning: cannot export hidden symbol std::basic_stringbuf<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >::~basic_stringbuf() from .libs/complex_io.o
ld: warning: cannot export hidden symbol std::ctype<char>::do_widen(char) const from .libs/ctype.o
ld: warning: cannot export hidden symbol std::ctype<char>::do_narrow(char, char) const from .libs/ctype.o
ld: warning: cannot export hidden symbol std::ctype<char>::do_narrow(char const*, char const*, char, char*) const from .libs/ctype.o
ld: warning: cannot export hidden symbol std::ctype<char>::do_widen(char const*, char const*, char*) const from .libs/ctype.o
ld: warning: cannot export hidden symbol __gnu_cxx::stdio_sync_filebuf<wchar_t, std::char_traits<wchar_t> >::~stdio_sync_filebuf() from .libs/misc-inst.o
ld: warning: cannot export hidden symbol __gnu_cxx::stdio_sync_filebuf<wchar_t, std::char_traits<wchar_t> >::xsputn(wchar_t const*, long) from .libs/misc-inst.o
ld: warning: cannot export hidden symbol __gnu_cxx::stdio_sync_filebuf<wchar_t, std::char_traits<wchar_t> >::xsgetn(wchar_t*, long) from .libs/misc-inst.o
ld: warning: cannot export hidden symbol __gnu_cxx::stdio_sync_filebuf<char, std::char_traits<char> >::xsputn(char const*, long) from .libs/misc-inst.o
ld: warning: cannot export hidden symbol __gnu_cxx::stdio_sync_filebuf<char, std::char_traits<char> >::xsgetn(char*, long) from .libs/misc-inst.o
ld: warning: cannot export hidden symbol __gnu_cxx::stdio_sync_filebuf<char, std::char_traits<char> >::~stdio_sync_filebuf() from .libs/misc-inst.o
ld: warning: cannot export hidden symbol __gnu_cxx::stdio_sync_filebuf<char, std::char_traits<char> >::~stdio_sync_filebuf() from .libs/misc-inst.o
ld: warning: cannot export hidden symbol __gnu_cxx::stdio_sync_filebuf<wchar_t, std::char_traits<wchar_t> >::~stdio_sync_filebuf() from .libs/misc-inst.o
ld: warning: cannot export hidden symbol std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::~basic_stringbuf() from .libs/sstream-inst.o
ld: warning: cannot export hidden symbol std::basic_stringbuf<wchar_t, std::char_traits<wchar_t>, std::allocator<wchar_t> >::~basic_stringbuf() from .libs/sstream-inst.o
ldld: warning: cannot export hidden symbol __cxxabiv1::__pbase_type_info::__pointer_catch(__cxxabiv1::__pbase_type_info const*, void**, unsigned int) const from ../libsupc++/.libs/libsupc++convenience.a(pbase_type_info.o)

Should I open a PR for them?

TIA

Dominique