From 14158ad5fc38836854a1a52ed03e6174a4083a96 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Tue, 31 May 2016 01:23:48 -0400
Subject: Makefile: run with --warn-undefined-variables

---
 build-aux/Makefile.once.head/20-libretools.mk | 2 ++
 build-aux/no-builtin-variables.mk             | 4 ++++
 config.mk                                     | 1 +
 3 files changed, 7 insertions(+)

diff --git a/build-aux/Makefile.once.head/20-libretools.mk b/build-aux/Makefile.once.head/20-libretools.mk
index 48964d9..d7c3b0e 100644
--- a/build-aux/Makefile.once.head/20-libretools.mk
+++ b/build-aux/Makefile.once.head/20-libretools.mk
@@ -58,6 +58,8 @@ detect-ronn = $(filter-out $(detect-ignore-ronn),$(filter %.ronn     ,$(detect-a
 detect-md   = $(filter-out $(detect-ignore-md)  ,$(filter %.ronn %.md,$(detect-all)))
 detect-sh   = $(filter-out $(detect-ignore-sh)  ,$(filter %.sh       ,$(detect-all)))
 
+LIBREXGETTEXT_FLAGS ?=
+
 ifeq ($(wildcard $(topsrcdir)/.git),)
 include $(topsrcdir)/.srcversion-libretools.mk
 else
diff --git a/build-aux/no-builtin-variables.mk b/build-aux/no-builtin-variables.mk
index c236c73..c3aef58 100644
--- a/build-aux/no-builtin-variables.mk
+++ b/build-aux/no-builtin-variables.mk
@@ -9,3 +9,7 @@ $(foreach v,$(filter-out .% MAKE% SUFFIXES,$(_default_variables))\
             $(filter .LIBPATTERNS MAKEINFO,$(_default_variables)),\
   $(eval undefine $v))
 undefine _default_variables
+
+# Because Make uses .LIBPATTERNS internally, it should always be
+# defined in case --warn-undefined-variables
+.LIBPATTERNS ?=
diff --git a/config.mk b/config.mk
index 5c45630..27dbe80 100644
--- a/config.mk
+++ b/config.mk
@@ -7,6 +7,7 @@ ifeq ($(topsrcdir),)
 topoutdir := $(patsubst %/,%,$(dir $(lastword $(MAKEFILE_LIST))))
 topsrcdir := $(topoutdir)
 
+MAKEFLAGS += --warn-undefined-variables
 include $(topsrcdir)/build-aux/no-builtin-variables.mk
 
 PACKAGE = libretools
-- 
cgit v1.2.2