c/6343: attribute((weak)) not working on second declaration

[harinath@cs.umn.edu]

>Number:         6343
>Category:       c
>Synopsis:       attribute((weak)) not working on second declaration
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Apr 17 18:06:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     harinath@cs.umn.edu
>Release:        gcc version 3.2 20020416 (experimental)
>Organization:
>Environment:
i686-pc-linux-gnu
>Description:
gcc/crtstuff.c depends on being able to do

  int foo(void);
  int foo(void) attribute((weak));

and have the symbol 'foo' being marked weak.

This doesn't seem to be working.

Here are two compiles of the attached file, and the output of nm.

$ gcc -shared -o foo.so foo.c
$ nm --dynamic foo.so
00001838 A _DYNAMIC
00001914 A _GLOBAL_OFFSET_TABLE_
         w _Jv_RegisterClasses
00001944 A __bss_start
         w __cxa_finalize
         U __deregister_frame_info_bases
         w __gmon_start__
         U __register_frame_info_bases
00001944 A _edata
00001960 A _end
00000810 T _fini
000005cc T _init
00000790 T bar
         w foo
$ gcc -DNONWEAK -shared -o foo.so foo.c
$ nm --dynamic foo.so
00001838 A _DYNAMIC
00001914 A _GLOBAL_OFFSET_TABLE_
         w _Jv_RegisterClasses
00001944 A __bss_start
         w __cxa_finalize
         U __deregister_frame_info_bases
         w __gmon_start__
         U __register_frame_info_bases
00001944 A _edata
00001960 A _end
00000810 T _fini
000005cc T _init
00000790 T bar
         U foo

Notice 'foo' is not marked weak in the second case.  This is exactly the way this attribute is used in gcc/crtstuff.c (which is also reflected above, see the non-weak references to __register_frame_info_bases, and the weak reference to __cxa_finalize).
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/x-csrc; name="foo.c"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="foo.c"

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