[Bug c++/33399] New: [4.2 regression] -fvisibility=hidden not working after including STL headers

["mueller at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

Hi, 

g++ 4.2.1 doesn't seem to apply hidden visibility to classes after including
e.g. <ostream>. 

the following testcase was reduced: 

=== Cut ===
namespace std  __attribute__ ((__visibility__ ("default")))
{
  template < typename A > class C;
  template < typename A > int foo (C < A > *);

  template < typename A > class C
  {
  public:
    friend int foo<>(C <A > *);
  };
  extern template class C < char >;
}

struct TestClass
{
  void hidden();
};
void TestClass::hidden() {}
=== cut ===
g++ -O1 -fvisibility=hidden -fvisibility-inlines-hidden -fPIC testcase.cc -c -o
nostl.o
g++ -shared -o libnostl.so nostl.o
nm -CD libnostl.so | grep TestClass 

gives

0000048c T TestClass::hidden()


the symbol is properly hidden if I put the namespace std into default
visibility or otherwise try to reduce the code further.


-- 
           Summary: [4.2 regression] -fvisibility=hidden not working after
                    including STL headers
           Product: gcc
           Version: 4.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mueller at gcc dot gnu dot org
  GCC host triplet: i686-suse-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33399