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@@ -0,0 +1,32 @@
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+I use uclibc in arch arm. The CFLAGS-pthread_once.c has been set
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+to -DNOT_IN_libc -DIS_IN_libpthread in
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+libpthread/nptl/sysdeps/unix/sysv/linux/arm/Makefile.arch.
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+But it will be replaced by -fexceptions -fasynchronous-unwind-tables in
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+libpthread/nptl/Makefile.in.
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+
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+If CFLAGS-pthread_once.c has no -DIS_IN_libpthread the testcase
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+tst-once3 in test/nptl/ will be failed. The reason is pthread_once
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+calls another pthread_cleanup_push() which is not under IS_IN_libpthread
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+so that clear_once_control do not be called when the thread is canceled.
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+So pthread_once will hang up when it's called second time.
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+
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+Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
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+---
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+ libpthread/nptl/Makefile.in | 2 +-
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+ 1 file changed, 1 insertion(+), 1 deletion(-)
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+
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+diff --git a/libpthread/nptl/Makefile.in b/libpthread/nptl/Makefile.in
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+index 0008822..1b9ba8c 100644
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+--- a/libpthread/nptl/Makefile.in
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++++ b/libpthread/nptl/Makefile.in
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+@@ -186,7 +186,7 @@ CFLAGS-forward.c = -fexceptions
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+ CFLAGS-pthread_testcancel.c = -fexceptions
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+ CFLAGS-pthread_join.c = -fexceptions -fasynchronous-unwind-tables
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+ CFLAGS-pthread_timedjoin.c = -fexceptions -fasynchronous-unwind-tables
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+-CFLAGS-pthread_once.c = $(uses-callbacks) -fexceptions \
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++CFLAGS-pthread_once.c += $(uses-callbacks) -fexceptions \
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+ -fasynchronous-unwind-tables
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+ CFLAGS-pthread_cond_wait.c = -fexceptions -fasynchronous-unwind-tables
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+ CFLAGS-pthread_cond_timedwait.c = -fexceptions -fasynchronous-unwind-tables
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+--
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+1.8.0
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Waldemar Brodkorb