From f602c8fe063392e9f38390c6eb0816bef85063ac Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Sun, 12 Jun 2016 11:12:23 -0400
Subject: (systemd) add at.addprefix, a safe root-aware addprefix for
 directories

---
 build-aux/Makefile.head.mk | 7 ++++++-
 build-aux/Makefile.tail.mk | 6 +++---
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/build-aux/Makefile.head.mk b/build-aux/Makefile.head.mk
index 63a3462..47c17c9 100644
--- a/build-aux/Makefile.head.mk
+++ b/build-aux/Makefile.head.mk
@@ -34,11 +34,16 @@ at.relto = $(foreach p,$2,$(call _at.relto,$1,$p))
 # itself.
 at.path = $(call at.relto,.,$1)
 
+_at.addprefix = $(if $(filter /%,$2),$2,$1/$2)
+at.addprefix = $(call at.path,$(foreach f,$2, $(call _at.addprefix,$1,$f) ))
+
 define at.nl
 
 
 endef
 
+at.Makefile ?= Makefile
+
 _at.rest = $(wordlist 2,$(words $1),$1)
 _at.reverse = $(if $1,$(call _at.reverse,$(_at.rest))) $(firstword $1)
 
@@ -56,7 +61,7 @@ endif # _at.NO_ONCE
 outdir := $(call at.path,$(dir $(lastword $(filter-out %.mk,$(MAKEFILE_LIST)))))
 srcdir := $(call at.path,$(topsrcdir)/$(call _at.relto,$(topoutdir),$(outdir)))
 
-_at.included_makefiles := $(_at.included_makefiles) $(call at.path,$(outdir)/Makefile)
+_at.included_makefiles := $(_at.included_makefiles) $(call at.path,$(outdir)/$(at.Makefile))
 
 $(foreach v,$(at.dirlocal),$(eval $v=))
 
diff --git a/build-aux/Makefile.tail.mk b/build-aux/Makefile.tail.mk
index b1c5045..be3a8c2 100644
--- a/build-aux/Makefile.tail.mk
+++ b/build-aux/Makefile.tail.mk
@@ -17,8 +17,8 @@
 
 include $(call _at.reverse,$(sort $(wildcard $(topsrcdir)/build-aux/Makefile.each.tail/*.mk)))
 
-at.subdirs := $(patsubst ./%,%,$(addprefix $(outdir)/,$(at.subdirs)))
-at.depdirs :=                                         $(at.depdirs)
+at.subdirs := $(call at.addprefix,$(outdir)/,$(at.subdirs))
+at.depdirs := $(call at.addprefix,$(outdir)/,$(at.depdirs))
 
 # Move all of the dirlocal variables to their namespaced version
 $(foreach v,$(at.dirlocal),$(eval $v/$(outdir) := $$($v)))
@@ -35,7 +35,7 @@ $(foreach t,$(at.phony),$(eval $(outdir)/$t: $(addsuffix /$t,$(at.subdirs/$(outd
 
 # Include Makefiles from other directories
 $(foreach _at.NO_ONCE,y,\
-	$(foreach makefile,$(call at.path,$(addsuffix /Makefile,$(at.subdirs/$(outdir)) $(at.depdirs/$(outdir)))),\
+	$(foreach makefile,$(call at.path,$(addsuffix /$(at.Makefile),$(at.subdirs/$(outdir)) $(at.depdirs/$(outdir)))),\
 		$(eval include $(filter-out $(_at.included_makefiles),$(makefile)))))
 
 # This bit only gets evaluated once, after all of the other Makefiles are read
-- 
cgit v1.2.3-54-g00ecf