From d0108be2338f6922e7c3c9015ffacbe9582a0518 Mon Sep 17 00:00:00 2001
From: Tim Segers <tsegers@pm.me>
Date: Mon, 2 Jan 2023 16:05:34 +0100
Subject: Restructure makefile

---
 .gitignore |  3 +++
 Makefile   | 56 ++++++++++++++++++++++++++++++++++++++++----------------
 2 files changed, 43 insertions(+), 16 deletions(-)

diff --git a/.gitignore b/.gitignore
index c6127b3..29a182b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,6 +42,9 @@
 *.idb
 *.pdb
 
+# Dep files
+.dep
+
 # Kernel Module Compile Results
 *.mod*
 *.cmd
diff --git a/Makefile b/Makefile
index 4a815b0..6ac73b0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,23 +1,22 @@
-PREFIX = /usr/local
-
 VERSION = \"$(shell git describe --tags --dirty)\"
-CFLAGS = --std=c99 -pedantic -Wall -Werror -Os -I. -D_DEFAULT_SOURCE -DVERSION=${VERSION}
 
-all: opendeco opendeco_test libopendeco.a
+CC=gcc
+
+IFLAGS = -I.
+LFLAGS = -lm
 
-opendeco: src/opendeco.c src/deco.c src/deco.h src/schedule.c src/schedule.h src/output.c src/output.h src/opendeco-cli.h src/opendeco-cli.c src/opendeco-conf.h src/opendeco-conf.c toml/toml.c toml/toml.h
-	$(CC) $(CFLAGS) src/opendeco.c src/deco.c src/schedule.c src/output.c src/opendeco-cli.c src/opendeco-conf.c toml/toml.c -lm -o opendeco
+CFLAGS = -Wall -Werror --std=c99 -pedantic $(IFLAGS) -D_DEFAULT_SOURCE -DVERSION=${VERSION}
+LDFLAGS = $(LFLAGS)
 
-opendeco_test: test/opendeco_test.c test/deco_test.c src/deco.c minunit/minunit.c minunit/minunit.h
-	$(CC) $(CFLAGS) minunit/minunit.c test/opendeco_test.c test/deco_test.c src/deco.c -lm -o opendeco_test
+PREFIX = /usr/local
 
-libopendeco.a:
-	$(CC) -c src/deco.c -o src/deco.o
-	$(CC) -c src/schedule.c -o src/schedule.o
-	$(CC) -c src/output.c -o src/output.o
-	ar rs libopendeco.a src/deco.o src/schedule.o src/output.o
+OBJ_BIN = src/opendeco.o src/opendeco-cli.o src/opendeco-conf.o src/deco.o src/output.o src/schedule.o toml/toml.o
+OBJ_LIB = src/deco.o src/output.o src/schedule.o
+OBJ_TST = test/opendeco_test.o test/deco_test.o src/deco.o minunit/minunit.o
 
-lib: libopendeco.a
+DEPS = $(shell find -type f -name "*.dep")
+
+all: opendeco opendeco_test libopendeco.a
 
 run: opendeco
 	./opendeco -d 30 -t 120 -g EAN32 --decogasses EAN50
@@ -25,7 +24,9 @@ run: opendeco
 test: opendeco_test
 	./opendeco_test
 
-install: all
+lib: libopendeco.a
+
+install: opendeco
 	mkdir -p ${DESTDIR}${PREFIX}/bin
 	cp -f opendeco ${DESTDIR}${PREFIX}/bin
 	chmod 755 ${DESTDIR}${PREFIX}/bin/opendeco
@@ -33,8 +34,31 @@ install: all
 uninstall:
 	rm -f ${DESTDIR}${PREFIX}/bin/opendeco
 
+opendeco: $(OBJ_BIN)
+	@echo "  LD      $@"
+	@$(CC) -o opendeco $(OBJ_BIN) $(LDFLAGS)
+
+opendeco_test: $(OBJ_TST)
+	@echo "  LD      $@"
+	@$(CC) -o opendeco_test $(OBJ_TST) $(LDFLAGS)
+
+libopendeco.a: $(OBJ_LIB)
+	@ar rs libopendeco.a $(OBJ_LIB)
+
+%.o: %.c
+	@echo "  CC      $@"
+	@mkdir -p .dep/$(dir $@)
+	@$(CC) $(CFLAGS) -MD -MF .dep/$@.dep -o $@ -c $<
+
 clean:
+	rm -f $(OBJ_BIN)
+	rm -f $(OBJ_LIB)
+	rm -f $(OBJ_TST)
 	rm -f opendeco
 	rm -f opendeco_test
-	rm -f src/*.o
 	rm -f libopendeco.a
+	rm -rf .dep
+
+-include $(DEPS)
+
+.PHONY: all run test lib install uninstall clean
-- 
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