Index: configure
===================================================================
--- configure	(revision 191955)
+++ configure	(working copy)
@@ -612,6 +612,7 @@
 BACKTRACE_SUPPORTS_THREADS
 PIC_FLAG
 WARN_FLAGS
+EXTRA_FLAGS
 BACKTRACE_FILE
 multi_basedir
 OTOOL64
@@ -11080,7 +11081,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11083 "configure"
+#line 11084 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11186,7 +11187,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11189 "configure"
+#line 11190 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11488,6 +11489,12 @@
 fi
 
 
+EXTRA_FLAGS=
+if test "x$GCC" = "xyes"; then
+  EXTRA_FLAGS=-funwind-tables
+fi
+
+
 WARN_FLAGS=
 save_CFLAGS="$CFLAGS"
 for real_option in -W -Wall -Wwrite-strings -Wstrict-prototypes \
Index: Makefile.in
===================================================================
--- Makefile.in	(revision 191955)
+++ Makefile.in	(working copy)
@@ -152,6 +152,7 @@
 ECHO_T = @ECHO_T@
 EGREP = @EGREP@
 EXEEXT = @EXEEXT@
+EXTRA_FLAGS = @EXTRA_FLAGS@
 FGREP = @FGREP@
 FORMAT_FILE = @FORMAT_FILE@
 GREP = @GREP@
@@ -253,7 +254,7 @@
 AM_CPPFLAGS = -I $(top_srcdir)/../include -I $(top_srcdir)/../libgcc \
 	-I ../libgcc -I ../gcc/include -I $(MULTIBUILDTOP)../../gcc/include
 
-AM_CFLAGS = $(WARN_FLAGS) $(PIC_FLAG)
+AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG)
 noinst_LTLIBRARIES = libbacktrace.la
 libbacktrace_la_SOURCES = \
 	backtrace.h \
Index: configure.ac
===================================================================
--- configure.ac	(revision 191955)
+++ configure.ac	(working copy)
@@ -96,6 +96,12 @@
 fi
 AC_SUBST(BACKTRACE_FILE)
 
+EXTRA_FLAGS=
+if test "x$GCC" = "xyes"; then
+  EXTRA_FLAGS=-funwind-tables
+fi
+AC_SUBST(EXTRA_FLAGS)
+
 ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
 			  -Wmissing-prototypes -Wold-style-definition \
 			  -Wmissing-format-attribute -Wcast-qual],
Index: Makefile.am
===================================================================
--- Makefile.am	(revision 191955)
+++ Makefile.am	(working copy)
@@ -34,7 +34,7 @@
 AM_CPPFLAGS = -I $(top_srcdir)/../include -I $(top_srcdir)/../libgcc \
 	-I ../libgcc -I ../gcc/include -I $(MULTIBUILDTOP)../../gcc/include
 
-AM_CFLAGS = $(WARN_FLAGS) $(PIC_FLAG)
+AM_CFLAGS = $(EXTRA_FLAGS) $(WARN_FLAGS) $(PIC_FLAG)
 
 noinst_LTLIBRARIES = libbacktrace.la