The program below fails to link with gcc 4.0.2. See also the closely related
bug 22263 (fixed in 4.0.2).
$ cat a.cpp && g++ -c a.cpp && g++ -DMAIN a.cpp a.o
template <class T> struct S { T foo (); T bar (); };
template <class T> T S<T>::foo () { return T (); };
#ifndef MAIN
template struct S<int>;
#else
extern template struct S<int>;
int main ()
{
return S<int>().foo () + S<int>().bar () ;
}
#endif
template <class T> T S<T>::bar () { return T (); };
Undefined first referenced
symbol in file
S<int>::bar() /var/tmp//ccAahmFW.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status
--
Summary: explicit instantiation/extern template unsats on symbols
defined later
Product: gcc
Version: 4.0.2
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: sebor at roguewave dot com
GCC build triplet: sparc-sun-solaris2.9
GCC host triplet: sparc-sun-solaris2.9
GCC target triplet: sparc-sun-solaris2.9
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24511
