Add rules to build libresolv with SSP flags

ChangeLog

@@ -1,3 +1,8 @@
+2011-08-17  Ulrich Drepper  <drepper@gmail.com>
+
+	* Makeconfig (override CFLAGS): Add library-specific CFLAGS.
+	* resolv/Makefile: Define CFLAGS-libresolv.
+
 2011-08-17  Andreas Schwab  <schwab@redhat.com>
 
 	* nss/makedb.c (compute_tables): Make variables used in nested
@@ -18,7 +23,7 @@
 	specifies first scope to show.
 	(dl_open_worker): Update callers.  Move printing scope of new
 	object to before the relocation.
-	* rtld.c (dl_main): Update _dl_show_scope call.
+	* elf/rtld.c (dl_main): Update _dl_show_scope call.
 	* sysdeps/generic/ldsodefs.h: Update declaration.
 
 	* elf/dl-open.c (_dl_show_scope): Use _dl_debug_printf to generate the
@@ -56,7 +61,7 @@
 
 2011-08-13  Ulrich Drepper  <drepper@gmail.com>
 
-	* elf/dl-open.c: Rename show_scope to _dl_schow_scope and export.
+	* elf/dl-open.c: Rename show_scope to _dl_show_scope and export.
 	(dl_open_worker): Call _dl_show_scope when DL_DEBUG_SCOPES is set.
 	* elf/rtld.c (dl_main): Set l_name of vDSO.
 	Call _dl_show_scope when DL_DEBUG_SCOPES.

Makeconfig

@@ -708,7 +708,9 @@ CPPFLAGS = $($(subdir)-CPPFLAGS) $(+includes) $(defines) \
 override CFLAGS	= -std=gnu99 $(gnu89-inline-CFLAGS) \
 		  $(filter-out %frame-pointer,$(+cflags)) $(+gccwarn-c) \
 		  $(sysdep-CFLAGS) $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) \
-		  $(CFLAGS-$(@F))
+		  $(CFLAGS-$(@F)) \
+		  $(foreach lib,$(libof-$(basename $(@F))) \
+				$(libof-$(<F)) $(libof-$(@F)),$(CFLAGS-$(lib)))
 override CXXFLAGS = $(c++-sysincludes) \
 		    $(filter-out %frame-pointer,$(+cflags)) $(sysdep-CFLAGS) \
 		    $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) $(CFLAGS-$(@F))

resolv/Makefile

@@ -76,6 +76,9 @@ CPPFLAGS += -Dgethostbyname=res_gethostbyname \
 	    -Dgetnetbyname=res_getnetbyname \
 	    -Dgetnetbyaddr=res_getnetbyaddr
 
+ifeq (yes,$(have-ssp))
+CFLAGS-libresolv += -fstack-protector
+endif
 CFLAGS-res_hconf.c = -fexceptions
 
 # The BIND code elicits some harmless warnings.