Implement _dl_catch_error, _dl_signal_error in libc.so [BZ #16628]

This change moves the main implementation of _dl_catch_error,
_dl_signal_error to libc.so, where TLS variables can be used
directly.  This removes a writable function pointer from the
rtld_global variable.

For use during initial relocation, minimal implementations of these
functions are provided in ld.so.  These are eventually interposed
by the libc.so implementations.  This is implemented by compiling
elf/dl-error-skeleton.c twice, via elf/dl-error.c and
elf/dl-error-minimal.c.

As a side effect of this change, the static version of dl-error.c
no longer includes support for the
_dl_signal_cerror/_dl_receive_error mechanism because it is only
used in ld.so.

1 files changed, 2 insertions, 2 deletions

diff --git a/dlfcn/dlerror.c b/dlfcn/dlerror.c
index 41b2bd6bf2..e0e5648696 100644
--- a/dlfcn/dlerror.c
+++ b/dlfcn/dlerror.c
@@ -160,8 +160,8 @@ _dlerror_run (void (*operate) (void *), void *args)
       result->errstring = NULL;
     }
 
-  result->errcode = GLRO(dl_catch_error) (&result->objname, &result->errstring,
-					  &result->malloced, operate, args);
+  result->errcode = _dl_catch_error (&result->objname, &result->errstring,
+				     &result->malloced, operate, args);
 
   /* If no error we mark that no error string is available.  */
   result->returned = result->errstring == NULL;