debug: Mark libSegFault.so as NODELETE

The signal handler installed in the ELF constructor cannot easily
be removed again (because the program may have changed handlers
in the meantime).  Mark the object as NODELETE so that the registered
handler function is never unloaded.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 23ee92deea4c99d0e6a5f48fa7b942909b123ec5)

diff --git a/debug/Makefile b/debug/Makefile
index 506cebc3c4ca19ffdf42635a5dfa7785aebe0a4d..8618d577f1383692b54b414c4a753140ef56d63d 100644 (file)
--- a/debug/Makefile
+++ b/debug/Makefile
@@ -168,6 +168,8 @@ extra-libs-others = $(extra-libs)
 
 libSegFault-routines = segfault
 libSegFault-inhibit-o = $(filter-out .os,$(object-suffixes))
+# libSegFault.so installs a signal handler in its ELF constructor.
+LDFLAGS-SegFault.so = -Wl,--enable-new-dtags,-z,nodelete
 
 libpcprofile-routines = pcprofile
 libpcprofile-inhibit-o = $(filter-out .os,$(object-suffixes))