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[v3] Link libstdc++ with -lpthread on IRIX 6 (PR target/47852)
- From: Rainer Orth <ro at CeBiTec dot Uni-Bielefeld dot DE>
- To: gcc-patches at gcc dot gnu dot org
- Cc: libstdc++ at gcc dot gnu dot org
- Date: Thu, 12 Jan 2012 11:21:47 +0100
- Subject: [v3] Link libstdc++ with -lpthread on IRIX 6 (PR target/47852)
When PR target/47852 was filed last year, it turned out that this seemed
to be the same problem as PR target/45693 on Tru64 UNIX, i.e. stub
implementations of pthread functions getting in the way, although I
couldn't really figure out how this happens. Since the problem on IRIX
didn't show up anywhere in the testsuite and seemed to be a weird corner
case, I all but forgot about it.
Recently, though, a couple of 30_threads testcases started to fail:
FAIL: 30_threads/future/cons/move_assign.cc execution test
FAIL: 30_threads/shared_future/cons/assign.cc execution test
FAIL: 30_threads/shared_future/cons/move_assign.cc execution test
like this:
terminate called after throwing an instance of 'std::system_error'
what(): Function not implemented
Abort
It turns out that __gthread_cond_broadcast in
void
condition_variable::notify_all() noexcept
{
int __e = __gthread_cond_broadcast(&_M_cond);
// XXX not in spec
// EINVAL
if (__e)
__throw_system_error(__e);
}
returns ENOSYS due to a stub for pthread_cond_broadcast in libc.
Linking libstdc++.so with -lpthread fixes those tests.
I've relinked libstdc++.so with -lpthread using the patch below and
rerun the libstdc++-v3 testsuite, where all 3 testcases pass now.
I'll include the patch in the next full mips-sgi-irix6.5 bootstrap this
weekend. Ok for mainline if that passes?
Thanks.
Rainer
2011-02-25 Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
PR target/47852
* configure.host (irix6.5*): Add -lpthread to OPT_LDFLAGS.
# HG changeset patch
# Parent dc4f565925904068ffc3f7444fbc4f73ebfdcd07
Link libstdc++ with -lpthread on IRIX 6 (PR target/47852)
diff -r dc4f56592590 libstdc++-v3/configure.host
--- a/libstdc++-v3/configure.host Tue Feb 22 15:54:16 2011 +0000
+++ b/libstdc++-v3/configure.host Fri Feb 25 19:39:22 2011 +0100
@@ -252,6 +252,10 @@
os_include_dir="os/irix/irix6.5"
atomicity_dir=os/irix
atomic_word_dir=os/irix
+ # libstdc++.so relies on emutls on IRIX, which only works with the
+ # real functions implemented in libpthread.so, not with the stubs in
+ # libc, so always pass -lpthread.
+ OPT_LDFLAGS="${OPT_LDFLAGS} -lpthread"
;;
mingw32*)
os_include_dir="os/mingw32"
--
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University