On Thu, Jul 14, 2005 at 04:10:14PM +0200, Bruno Haible wrote:
> I propose to add a new module 'lock' to gnulib. It addresses these problems.
> It will be used in gettext 0.15.
I looked through m4/lock.m4 to determine how you identify weak symbol
support on a system:
gl_have_weak=no
AC_TRY_LINK([extern void xyzzy ();
#pragma weak xyzzy], [xyzzy();], [gl_have_weak=yes])
I'm mainly interested with the vendor compiler, not GCC.
$ cat weak.c
extern void xyzzy ();
#pragma weak xyzzy
int
main (void) {
xyzzy();
}
(Solaris 2.6, 7, 8, 9, 10/SPARC)
$ cc weak.c
(HP-UX 11.00, 11i)
$ cc weak.c
cc: "weak.c", line 2: warning 21: Undefined pragma "WEAK" ignored.
/usr/ccs/bin/ld: Unsatisfied symbols:
xyzzy (first referenced in weak.o) (code)
(AIX 4.3.3, 5.1, 5.2)
$ cc weak.c
ld: 0711-317 ERROR: Undefined symbol: .xyzzy
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
(Tru64 UNIX 4.0D, 5.1)
$ cc weak.c
ld:
Unresolved:
xyzzy
(IRIX 6.5)
$ cc weak.c
So, according to your test, #pragma weak supports weak symbols on
Solaris and IRIX 6.5. However, in the case of pthread mutex'es, you
should really test for working stubs in libc:
http://lists.freedesktop.org/archives/cairo/2005-July/004465.html
If you do so, you'll get a failure on IRIX 6.5 and a success on HP-UX
11.x.
Some interesting references:
http://gcc.gnu.org/ml/gcc-help/2005-07/msg00095.html
http://groups-beta.google.com/group/comp.sys.sgi.admin/browse_thread/thread/4586067cd05bb6cb/d971cc2459ec0ded?q=pthread+group:comp.sys.sgi.admin+author:albert+author:chin&rnum=1&hl=en#d971cc2459ec0ded
--
albert chin ([EMAIL PROTECTED])
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