From 26ccaab75a1eae3d71a6497dacc7818f8e62417d Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Wed, 2 Sep 2015 13:24:13 -0600
Subject: Makefile variable tracking

---
 Makefile | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index 492bb7a..15c1c43 100644
--- a/Makefile
+++ b/Makefile
@@ -7,6 +7,9 @@ GOPATH := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
 
 CFLAGS = -std=c99 -Wall -Wextra -Werror -pedantic
 CGO_CFLAGS = $(CFLAGS) -Wno-unused-parameter
+export CGO_ENABLED = 1
+
+cgo_variables = CGO_ENABLED CGO_CFLAGS CGO_CPPFLAGS CGO_CXXFLAGS CGO_LDFLAGS CC CXX
 
 deps = gopkg.in/yaml.v2
 subdirs = src/nslcd_proto
@@ -18,7 +21,7 @@ include $(addsuffix /Makefile,$(subdirs))
 secondary += 
 download += $(addprefix src/,$(deps))
 generate +=
-build += bin/nshd
+build += bin/nshd nshd.service
 install += $(addprefix $(DESTDIR),$(bindir)/nshd $(systemddir)/system/nshd.socket $(systemddir)/system/nshd.service)
 
 download: $(download)
@@ -40,9 +43,13 @@ uninstall:
 $(foreach d,$(deps),$(eval src/$d: NET; GOPATH='$(GOPATH)' go get -d -u $d))
 .PHONY: NET
 
-bin/nshd: $(download) $(generate) $(shell find src -name .git -prune -o -print)
+bin/nshd: $(download) $(generate) $(shell find src -name .git -prune -o -print) $(addprefix .Makefile.var.,$(cgo_variables))
+	@true $(foreach f,$(filter .Makefile.var.%,$^), && test $@ -nt $f ) || rm -rf -- bin pkg
 	GOPATH='$(GOPATH)' CGO_CFLAGS='$(CGO_CFLAGS)' go install nshd
 
+nshd.service: nshd.service.in .Makefile.var.bindir
+	< $< sed 's|@bindir@|$(bindir)|g' > $@
+
 $(DESTDIR)$(bindir)/%: bin/%
 	install -Dm755 $< $@
 $(DESTDIR)$(systemddir)/system/%.socket: %.socket
@@ -50,5 +57,9 @@ $(DESTDIR)$(systemddir)/system/%.socket: %.socket
 $(DESTDIR)$(systemddir)/system/%.service: %.service
 	install -Dm644 $< $@
 
+.Makefile.var.%: FORCE
+	@printf '%s' '$($*)' > .tmp$@ && { cmp -s .tmp$@ $@ && rm -f -- .tmp$@ || mv -Tf .tmp$@ $@; } || { rm -f -- .tmp$@; false; }
+.PHONY: FORCE
+
 .SECONDARY:
 .DELETE_ON_ERROR:
-- 
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