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From: "Yves Monier" <yves.monier@temis-group.com>
To: <gcc-help@gcc.gnu.org>
Subject: Getting undefined references using gcc3.4
Date: Mon, 10 Oct 2005 15:09:00 -0000
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Hello,

I'm getting undefined references using gcc3.4 when linking a program against 
one of my shared libraries:
.../libxeldaCommon_sd.so: undefined reference to `std::basic_string<char, 
std::char_traits<char>, std::allocator<char> >::_M_check(unsigned int) 
const'
.../libxeldaCommon_sd.so: undefined reference to `std::basic_string<char, 
std::char_traits<char>, std::allocator<char> >::_Rep::_S_create(unsigned 
int, std::allocator<char> const&)'
.../libxeldaCommon_sd.so: undefined reference to `std::basic_string<char, 
std::char_traits<char>, std::allocator<char> >::_S_empty_rep_storage'
.../libxeldaCommon_sd.so: undefined reference to 
`std::__default_alloc_template<true, 0>::deallocate(void*, unsigned int)'

While I have no errors when I build the same libraries and programs with gcc 
3.2 (same gcc 3.2 / gcc 3.4 command lines).

I guess these errors are related to template instantiations. If I'm not 
mistaken I have three options for dealing with them:

- do nothing (i.e. no particular compile & link options for templates): this 
is currently what I do. This works with gcc 3.2. I know this can lead with 
code duplication, but I can leave with that for the moment (size of 
libraries produced with gcc 3.2 remains correct)

- use -frepo option. I tried that, and had to do a strange two-steps link:
g++ -o /dev/null <object files> <linker options> > foo.log    (many errors 
but cause instantiations to be generated?)
then
g++ -shared -g -o <lib name> <object files> <linker options>    (library 
properly created)
Still, when I link the program against the produced library, I get the same 
undefined references...

- use -frepo and -fno-implicit-templates: not tried yet (would prefer no to 
write the explicit instantiations myself...)

Any suggestion?

I saw two messages referring to two of the symbols above, but without 
solution:
http://gcc.gnu.org/ml/gcc-help/2005-05/msg00269.html and 
http://gcc.gnu.org/ml/gcc-help/2005-05/msg00305.html

Many thanks for your help!

Best regards,

Yves