From 1c5a4e839cf68c45d7b2a15bd5f64290d2154118 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Wed, 1 Jun 2016 16:14:57 -0400
Subject: (systemd) Be a little tougher with --no-builtin-variables

---
 build-aux/no-builtin-variables.mk | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 build-aux/no-builtin-variables.mk

(limited to 'build-aux')

diff --git a/build-aux/no-builtin-variables.mk b/build-aux/no-builtin-variables.mk
new file mode 100644
index 0000000..c3aef58
--- /dev/null
+++ b/build-aux/no-builtin-variables.mk
@@ -0,0 +1,15 @@
+MAKEFLAGS += --no-builtin-variables
+
+# This version is more correct, but is slower:
+#   $(foreach v,$(shell bash -c 'comm -23 <(env -i $(MAKE) -f - <<<"\$$(info \$$(.VARIABLES))all:"|sed "s/ /\n/g"|sort) <(env -i $(MAKE) -R -f - <<<"\$$(info \$$(.VARIABLES))all:"|sed "s/ /\n/g"|sort)'),
+#     $(if $(filter default,$(origin $v)),$(eval undefine $v)))
+
+_default_variables = $(foreach v,$(.VARIABLES),$(if $(filter default,$(origin $v)),$v))
+$(foreach v,$(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 ?=
-- 
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