[Bug c++/43720] New: undefined reference to static const integral template class member

[roman at binarylife dot net]

$ cat test1.cpp
template<typename X>
void zzz(X const& x) {
   return;
}

struct ttt_t {
   static int const static_const_int=0;
   int func()const {
      zzz(static_const_int);
      return 0;
   }
};

int main() {
   return ttt_t().func();
}

$ g++ -O test1.cpp --save-temps
#no errors

$ g++ test1.cpp --save-temps
test1.o: In function `ttt_t::func() const':
test1.cpp:(.text._ZNK5ttt_t4funcEv[ttt_t::func() const]+0xd): undefined
reference to `ttt_t::static_const_int'
collect2: ld returned 1 exit status

$ grep 'static_const_int' test1.s
        movl    $_ZN5ttt_t16static_const_intE, %edi

$ cat test2.cpp
template<typename X>
void __attribute((noinline)) zzz(X const& x) {
   static bool volatile junk=false;
   if (junk) zzz(x);
   return;
}

struct ttt_t {
   static int const static_const_int=0;
   int func()const {
      zzz(static_const_int);
      return 0;
   }
};

int main() {
   return ttt_t().func();
}

$ g++ -O3 test2.cpp --save-temps
#no errors

$ g++ -O2 test2.cpp --save-temps
test2.o: In function `main':
test2.cpp:(.text+0x5): undefined reference to `ttt_t::static_const_int'
collect2: ld returned 1 exit status

$ grep 'static_const_int' test2.s
        movl    $_ZN5ttt_t16static_const_intE, %edi

4.4.4 has same issues except that -O3 fails with test2.cpp


-- 
           Summary: undefined reference to static const integral template
                    class member
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: roman at binarylife dot net
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43720