[Bug c++/21832] New: Linker error when taking reference of static integral data member

["bernie at develer dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Also happens with 3.3.5 and 4.0.0.  The test case
is so simple I'm surprised nobody noticed before.
Unless of course I need to take a new C++ course.

---cut---
void bar(const int &a) { }

struct Foo
{
        static const int X = 10;
};

int main()
{
        bar(Foo::X);
        return 0;
}
---cut---

/tmp/ccYC57Zg.o(.text+0x23): In function `main':
foo.cpp: undefined reference to `Foo::X'
collect2: ld returned 1 exit status

-- 
           Summary: Linker error when taking reference of static integral
                    data member
           Product: gcc
           Version: 3.4.3
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: critical
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: bernie at develer dot com
                CC: aleph at develer dot com,gcc-bugs at gcc dot gnu dot
                    org,giovannibajo at libero dot it
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21832