From 67c0a9b10b74cb56d863245bc2ccadd302b11924 Mon Sep 17 00:00:00 2001
From: vanhofen <vanhofen@gmx.de>
Date: Thu, 24 Oct 2019 01:33:50 +0200
Subject: [PATCH] - helpers.mk: add case conversion macros; stolen from
 buildroot

---
 make/helpers.mk | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/make/helpers.mk b/make/helpers.mk
index 8a120714..3960e938 100644
--- a/make/helpers.mk
+++ b/make/helpers.mk
@@ -60,6 +60,26 @@ endef
 
 # -----------------------------------------------------------------------------
 
+#
+# Case conversion macros.
+#
+
+[LOWER] := a b c d e f g h i j k l m n o p q r s t u v w x y z
+[UPPER] := A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
+
+define caseconvert-helper
+$(1) = $$(strip \
+	$$(eval __tmp := $$(1))\
+	$(foreach c, $(2),\
+		$$(eval __tmp := $$(subst $(word 1,$(subst :, ,$c)),$(word 2,$(subst :, ,$c)),$$(__tmp))))\
+	$$(__tmp))
+endef
+
+$(eval $(call caseconvert-helper,UPPERCASE,$(join $(addsuffix :,$([LOWER])),$([UPPER]))))
+$(eval $(call caseconvert-helper,LOWERCASE,$(join $(addsuffix :,$([UPPER])),$([LOWER]))))
+
+# -----------------------------------------------------------------------------
+
 #
 # $(1) = title
 # $(2) = color