nptl: Move __pthread_unwind_next into libc

It's necessary to stub out __libc_disable_asynccancel and
__libc_enable_asynccancel via rtld-stubbed-symbols because the new
direct references to the unwinder result in symbol conflicts when the
rtld exception handling from libc is linked in during the construction
of librtld.map.

unwind-forcedunwind.c is merged into unwind-resume.c.  libc now needs
the functions that were previously only used in libpthread.

The GLIBC_PRIVATE exports of __libc_longjmp and __libc_siglongjmp are
no longer needed, so switch them to hidden symbols.

The symbol __pthread_unwind_next has been moved using
scripts/move-symbol-to-libc.py.

Reviewed-by: Adhemerva Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/nptl/pthread_exit.c b/nptl/pthread_exit.c
index 4afc406268..aed8c12e17 100644
--- a/nptl/pthread_exit.c
+++ b/nptl/pthread_exit.c
@@ -18,11 +18,20 @@
 
 #include <stdlib.h>
 #include "pthreadP.h"
-
+#include <unwind-link.h>
+#include <stdio.h>
+#include <gnu/lib-names.h>
 
 void
 __pthread_exit (void *value)
 {
+  {
+    struct unwind_link *unwind_link = __libc_unwind_link_get ();
+    if (unwind_link == NULL)
+      __libc_fatal (LIBGCC_S_SO
+                    " must be installed for pthread_exit to work\n");
+  }
+
   THREAD_SETMEM (THREAD_SELF, result, value);
 
   __do_cancel ();