Conference turris::c_plus_plus

3578.0. "Typedef map of map STL, ld: unresolved ...?" 3578.0" by KERNEL::PULLEY (Come! while living waters flow) Wed May 21 1997 11:21

Hi,

I've a customer on Digital UNIX v4.0 564, C++ v5.5-004.
They find that if they try to use a map of map, at the link stage they get
a large unresolved symbol.

csh> more some_maps.cxx
#include <string>
#include <map>
typedef map<string,int> mapsi;
typedef map<string,mapsi> mapsmsi;

csh> cxx some_maps.cxx
ld:
Unresolved:
main
rb_tree<basic_string<char, string_char_traits<char>, allocator<char> >,
pair<con
st basic_string<char, string_char_traits<char>, allocator<char> >,
map<basic_str
ing<char, string_char_traits<char>, allocator<char> >, int,
less<basic_string<ch
ar, string_char_traits<char>, allocator<char> > >, allocator<pair<const
basic_st
ring<char, string_char_traits<char>, allocator<char> >, int> > > >,
select1st<pa
ir<const basic_string<char, string_char_traits<char>, allocator<char> >,
map<bas
ic_string<char, string_char_traits<char>, allocator<char> >, int,
less<basic_str
ing<char, string_char_traits<char>, allocator<char> > >, allocator<pair<const
ba
sic_string<char, string_char_traits<char>, allocator<char> >, int> > > >,
basic_
string<char, string_char_traits<char>, allocator<char> > >,
less<basic_string<ch
ar, string_char_traits<char>, allocator<char> > >, >::NIL

Thanks for any suggestions,
Steve.

This was added to the V5.6 (field test) release notes,
in Section 1.13.7 Known Problems:

     When creating very complicated instantiations (for example, a map of a map
of string), you may get a link error when using automatic instantiation (the
name of the undefined symbol will be longer than 1022 chars). 

     To workaround this, you can use manual instantiation or local instantiation
(see Section 1.11). 

If I compile your program with -nopt -define_templates, it works.