Check for GNU ld and use the flags depending on the outcome

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>

configure.ac

@@ -32,6 +32,11 @@ AC_PROG_CC
 # Initialize libtool
 LT_PREREQ([2.2])
 LT_INIT
+LT_PATH_LD
+if test "x$lt_cv_prog_gnu_ld" = "xyes"; then
+	GNU_LD_FLAGS="-Wl,--as-needed -Wl,--gc-sections -Wl,-z,relro -Wl,-z,now"
+	AC_SUBST(GNU_LD_FLAGS)
+fi
 
 PKG_PROG_PKG_CONFIG()
 PKG_CHECK_MODULES(CHECK, [check], [HAVE_CHECK="yes"], [HAVE_CHECK="no"])

libevdev/Makefile.am

@@ -15,10 +15,7 @@ libevdev_la_LDFLAGS = \
 	-version-info $(LIBEVDEV_LT_VERSION) \
 	-export-symbols-regex '^libevdev_' \
 	$(GCOV_LDFLAGS) \
-	-Wl,--as-needed \
-	-Wl,--gc-sections \
-	-Wl,-z,relro \
-	-Wl,-z,now
+	$(GNU_LD_FLAGS)
 
 libevdevincludedir = $(includedir)/libevdev-1.0/libevdev
 libevdevinclude_HEADERS = libevdev.h libevdev-uinput.h