c++/7597: Link failure when static constant is passed by reference

c++/7597: Link failure when static constant is passed by reference

[juan+gnats]

>Number:         7597
>Category:       c++
>Synopsis:       Link failure when static constant is passed by reference
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 14 07:06:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     juan+gnats@port25.com
>Release:        3.1.1
>Organization:
>Environment:
i386, RedHat Linux 7.3, glibc-2.2.5-37
>Description:
When compiling code like this

  class C {
  public:
      static const int X = 0;
  };

  void doit(const int& i) {}

  int main() {
      doit(C::X);
  }

gcc 3.1.1 yields the following error:

  /tmp/ccCTacI4.o: In function `main':
  /tmp/ccCTacI4.o(.text+0x1a): undefined reference to `C::X'
  collect2: ld returned 1 exit status
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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Re: c++/7597: Link failure when static constant is passed by reference

[nathan]

Synopsis: Link failure when static constant is passed by reference

State-Changed-From-To: open->closed
State-Changed-By: nathan
State-Changed-When: Wed Aug 14 07:34:46 2002
State-Changed-Why:
    not a bug. you need a definition of the static const. see 9.4.2/4

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7597