build: when checking for additional flags, be fatal on errors

diff --git a/m4/ax_ld_check_flag.m4 b/m4/ax_ld_check_flag.m4
index 123c4507998a8a74d43003e0ae30a9a1fe4ab1af..2da32410b5f3eb202d28cff26fe4aba6f53bb35d 100644 (file)
--- a/m4/ax_ld_check_flag.m4
+++ b/m4/ax_ld_check_flag.m4
@@ -62,7 +62,7 @@ AC_DEFUN([AX_LDFLAGS_OPTION],[
     AC_LANG_C
 
     save_LDFLAGS="$LDFLAGS"
-    LDFLAGS="$LDFLAGS $[]m4_ifval($2,$2,) $1"
+    LDFLAGS="-Werror $LDFLAGS $[]m4_ifval($2,$2,) $1"
     AC_LINK_IFELSE([
       AC_LANG_PROGRAM([],[])
     ],[