From 4f69e91b44b4ae80b90aa25ce1114ed338923fd4 Mon Sep 17 00:00:00 2001
From: johannst <johannes.stoelp@gmail.com>
Date: Sun, 4 Oct 2020 10:49:20 +0200
Subject: add dependecy generation

---
 .gitignore   |  1 +
 lib/Makefile | 22 +++++++++++++---------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/.gitignore b/.gitignore
index 126d07f..a47d4f6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *.o
+*.d
 *.a
 demo1
 
diff --git a/lib/Makefile b/lib/Makefile
index c880346..24fe7bd 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -10,21 +10,25 @@ AS       := $(PREFIX)gcc
 ASFLAGS  := -g -O0
 CXX      := $(PREFIX)g++
 CXXFLAGS := -g -O0 -Wall -Wextra -I.
+DEPS_GEN := -MMD
 AR       := $(PREFIX)ar
 
-libmatcha.a: thread.o executor.o                               \
-             thread.h executor.h                               \
-             arch/$(ARCH)/thread_create.o arch/$(ARCH)/yield.o \
-             arch/$(ARCH)/init_stack.o                         \
-             arch/$(ARCH)/api.h
-	$(AR) rcs $@ $(filter %.o,$^)
+OBJS := thread.o executor.o
+OBJS += arch/$(ARCH)/thread_create.o arch/$(ARCH)/yield.o arch/$(ARCH)/init_stack.o
+
+DEPS := $(OBJS:%.o=%.d)
+
+libmatcha.a: $(OBJS)
+	$(AR) rcs $@ $^
 
 %.o: %.cc
-	$(CXX) -c -o $@ $^ $(CXXFLAGS)
+	$(CXX) -c -o $@ $(CXXFLAGS) $(DEPS_GEN) $<
 
 %.o: %.s
-	$(AS) -c -o $@ $^ $(ASFLAGS)
+	$(AS) -c -o $@ $(ASFLAGS) $< 
 
 clean:
-	find . -name '*.o' -exec rm -f {} \;
+	rm -f $(OBJS) $(DEPS)
 	rm -f libmatcha.a
+
+-include $(DEPS)
-- 
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