1 files changed, 23 insertions, 0 deletions
diff --git a/conf/m4/plptools/AC_REMOVE_FORBIDDEN.m4 b/conf/m4/plptools/AC_REMOVE_FORBIDDEN.m4
new file mode 100644
index 0000000..77f0dca
--- /dev/null
+++ b/conf/m4/plptools/AC_REMOVE_FORBIDDEN.m4
@@ -0,0 +1,23 @@
+dnl AC_REMOVE_FORBIDDEN removes forbidden arguments from variables
+dnl use: AC_REMOVE_FORBIDDEN(CC, [-forbid -bad-option whatever])
+dnl it's all white-space separated
+AC_DEFUN(AC_REMOVE_FORBIDDEN,
+[ __val=$$1
+  __forbid=" $2 "
+  if test -n "$__val"; then
+    __new=""
+    ac_save_IFS=$IFS
+    IFS=" 	"
+    for i in $__val; do
+      case "$__forbid" in
+        *" $i "*) AC_MSG_WARN([found forbidden $i in $1, removing it]) ;;
+	*) # Careful to not add spaces, where there were none, because otherwise
+	   # libtool gets confused, if we change e.g. CXX
+	   if test -z "$__new" ; then __new=$i ; else __new="$__new $i" ; fi ;;
+      esac
+    done
+    IFS=$ac_save_IFS
+    $1=$__new
+  fi
+])
+