o Make compiler flags as well part of the dependencies which

allows easier playing around with flags.
radojko · Aug 27, 2015 · b102ca6 · b102ca6
1 parent b0e4d07
commit b102ca6
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Showing 3 changed files with 8 additions and 3 deletions.
diff --git a/Makefile b/Makefile
@@ -52,3 +52,4 @@ install-python: build-python
 	$(MAKE) -C $(PYTHON_LIB_DIR) install
 
 FORCE:
+.PHONY: FORCE
diff --git a/README.md b/README.md
@@ -399,7 +399,7 @@ For GPIO slow-down, uncomment the following line in [lib/Makefile](lib/Makefile)
 
      #DEFINES+=-DRGB_SLOWDOWN_GPIO   # remove '#' in the beginning
 
-Then `make clean` and `make` again.
+Then `make` again.
 
 Inverted Colors ?
 -----------------
@@ -412,7 +412,6 @@ at the beginning of the line.
 
 Then, recompile
 
-     make clean
      make
 
 A word about power

diff --git a/lib/Makefile b/lib/Makefile
@@ -63,8 +63,13 @@ thread.o : thread.cc $(INCDIR)/thread.h
 framebuffer.o: framebuffer.cc framebuffer-internal.h
 graphics.o: graphics.cc utf8-internal.h
 
-%.o : %.cc
+%.o : %.cc compiler-flags
 	$(CXX) -I$(INCDIR) $(CXXFLAGS) -c -o $@ $<
 
 clean:
 	rm -f $(OBJECTS) $(TARGET)
+
+compiler-flags: FORCE
+	@echo '$(CXXFLAGS)' | cmp -s - $@ || echo '$(CXXFLAGS)' > $@
+
+.PHONY: FORCE
Original file line number	Diff line number	Diff line change
Expand Up		@@ -52,3 +52,4 @@ install-python: build-python
		$(MAKE) -C $(PYTHON_LIB_DIR) install

		FORCE:
		.PHONY: FORCE