I'm using UnitTest++ to allow me to create unit tests for some C++ code (that should build on Linux or Mac OS X). I have a directory structure like this:
src
- Foo.cpp
- Bar.cpp
test
- FooTest.cpp
- BarTest.cpp
- Main.cpp
- Makefile
UnitTest++
- libUnitTest++.a
And this Makefile (adapted from the UnitTest++ Makefile) works nicely (with GNU make):
test = TestFooAndBar
src = ../src/Foo.cpp \
../src/Bar.cpp
test_src = Main.cpp \
FooTest.cpp \
BarTest.cpp
lib = ../UnitTest++/libUnitTest++.a
objects = $(patsubst %.cpp,%.o,$(src))
test_objects = $(patsubst %.cpp,%.o,$(test_src))
.PHONY: all
all: $(test)
@echo Running unit tests...
@./$(test)
$(test): $(lib) $(test_objects) $(objects)
@echo Linking $(test)...
@$(CXX) $(LDFLAGS) -o $(test) $(test_objects) $(objects) $(lib)
.PHONY: clean
clean:
-@$(RM) -f $(objects) $(test_objects) $(test) 2> /dev/null
%.o : %.cpp
@echo $<
@$(CXX) $(CXXFLAGS) -c $< -o $(patsubst %.cpp,%.o,$<)
But I want to put all the .o files in an "obj" subdirectory of the "test" directory. How do I modify this Makefile to do so?
I've tried adding "obj/" to the objects and test_objects variables, but I can't figure out how to modify the %.o rule so it knows where the .o files are and refers to the correct .cpp files. Do I need to create two separate rules, one for each set of .cpp files?
Would it be simpler if instead of defining the src and test_src variables, I just have the Makefile build a .o (into obj/) for all .cpp files (both in the same directory as the Makefile and in ../src/)?