--- libbacktrace/Makefile.am.jj	2012-10-02 15:36:21.000000000 +0200
+++ libbacktrace/Makefile.am	2012-12-06 19:36:05.888001803 +0100
@@ -34,7 +34,7 @@ ACLOCAL_AMFLAGS = -I .. -I ../config
 AM_CPPFLAGS = -I $(top_srcdir)/../include -I $(top_srcdir)/../libgcc \
 	-I ../libgcc -I ../gcc/include -I $(MULTIBUILDTOP)../../gcc/include
 
-AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG)
+AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG) -frandom-seed=$@
 
 noinst_LTLIBRARIES = libbacktrace.la
 
--- libbacktrace/Makefile.in.jj	2012-10-02 15:36:21.000000000 +0200
+++ libbacktrace/Makefile.in	2012-12-06 19:36:26.284875521 +0100
@@ -254,7 +254,7 @@ ACLOCAL_AMFLAGS = -I .. -I ../config
 AM_CPPFLAGS = -I $(top_srcdir)/../include -I $(top_srcdir)/../libgcc \
 	-I ../libgcc -I ../gcc/include -I $(MULTIBUILDTOP)../../gcc/include
 
-AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG)
+AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG) -frandom-seed=$@
 noinst_LTLIBRARIES = libbacktrace.la
 libbacktrace_la_SOURCES = \
 	backtrace.h \