Currently, I have my makefile set up to compile and make a fairly large project. I have written a second cpp file with main function for running tests. I want these to run separately, but build together and they use the same files. How is this accomplished?
edit: As reference, here is my current makefile. I'm not sure how to adjust it.
CC=g++
CFLAGS=-c -Wall -DDEBUG -g
LDFLAGS=
SOURCES=main.cpp Foo.cpp Bar.cpp Test.cpp A.cpp B.cpp C.cpp
OBJECTS=$(SOURCES:.cpp=.o)
EXECUTABLE=myprogram
all: $(SOURCES) $(EXECUTABLE)
$(EXECUTABLE): $(OBJECTS)
$(CC) $(LDFLAGS) $(OBJECTS) -o $@
.cpp.o:
$(CC) $(CFLAGS) $< -o $@
Normally you would just have multiple targets and do something like this:
.PHONY: all target tests
all: target tests
target: ...
...
tests: ...
...
Then you can just make
(defaults to make all
), or just make target
or make tests
as needed.
So for your makefile example above you might want to have something like this:
CC = g++
CFLAGS = -c -Wall -DDEBUG -g
LDFLAGS =
COMMON_SOURCES = Foo.cpp Bar.cpp A.cpp B.cpp C.cpp
TARGET_SOURCES = main.cpp
TEST_SOURCES = test_main.cpp
COMMON_OBJECTS = $(COMMON_SOURCES:.cpp=.o)
TARGET_OBJECTS = $(TARGET_SOURCES:.cpp=.o)
TEST_OBJECTS = $(TEST_SOURCES:.cpp=.o)
EXECUTABLE = myprogram
TEST_EXECUTABLE = mytestprogram
.PHONY: all target tests
all: target tests
target: $(EXECUTABLE)
tests: $(TEST_EXECUTABLE)
$(EXECUTABLE): $(COMMON_OBJECTS) $(TARGET_OBJECTS)
$(CC) $(LDFLAGS) $^ -o $@
$(TEST_EXECUTABLE): $(COMMON_OBJECTS) $(TEST_OBJECTS)
$(CC) $(LDFLAGS) $^ -o $@
.cpp.o:
$(CC) $(CFLAGS) $< -o $@
Here's one way to do it:
CXXFLAGS += -std=c++11 -Wall -O3
all: myprog mytest
myprog.cpp: main.cpp
cp -vf $< $@
myprog: myprog.o Foo.o Bar.o Test.o A.o B.o C.o
mytest.cpp: main.cpp
cp -vf $< $@
mytest.o: CPPFLAGS += -DDEBUG
mytest.o: CXXFLAGS += -O0 -g
mytest: mytest.o Foo.o Bar.o Test.o A.o B.o C.o
This works because built-in rules exist for compiling objects from c++ source (%.o: %.cpp
) and linking main programs (%: %.o
).
Also note the use of target-specific values for the variables CPPFLAGS
and CXXFLAGS
.
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