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From: "nathan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/51449] [4.7 regression] Rev181994 causes tramp3d-v4 profiled build failure
Date: Wed, 07 Dec 2011 20:35:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51449

Nathan Sidwell <nathan at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-12-07
     Ever Confirmed|0                           |1

--- Comment #2 from Nathan Sidwell <nathan at gcc dot gnu.org> 2011-12-07 20:35:18 UTC ---
Crud, not doing very well, am I?  Here's a reduced testcase:

template <typename T> struct TPL
{
  int Baz ();

  int Foo ()
  {
    return Baz ();
  }
};

extern template struct TPL<char>;

void Bar (TPL<char> *ptr)
{
  ptr->Foo ();
}

nathan@cartagia:53>./cc1plus -fprofile-arcs tpl.ii -Ofast
nathan@cartagia:53>grep gcov0 tpl.s 
    addl    $1, __gcov0__Z3BarP3TPLIcE
    adcl    $0, __gcov0__Z3BarP3TPLIcE+4
    addl    $1, __gcov0__ZN3TPLIcE3FooEv
    adcl    $0, __gcov0__ZN3TPLIcE3FooEv+4
    addl    $1, __gcov0__ZN3TPLIcE3FooEv+8
    adcl    $0, __gcov0__ZN3TPLIcE3FooEv+12
    addl    $1, __gcov0__Z3BarP3TPLIcE+8
    adcl    $0, __gcov0__Z3BarP3TPLIcE+12
    .local    __gcov0__Z3BarP3TPLIcE
    .comm    __gcov0__Z3BarP3TPLIcE,16,8
    .long    __gcov0__Z3BarP3TPLIcE

Notice __gcov0__ZN3TPLIcE3FooEv is referenced but not defined.