CODEWITHSUNDEEP
cunit-testingmakefilegnu-make
Austin Bodzas
Austin Bodzas

Reputation: 11

Compiling across different directories with GNU make

I have a project structure like such:

mcts/
    src/
        node_queue.c
        node_queue.h
    tests/
        munit.c    # testing frame work
        munit.h
        list_test.c # includes node_queue.h and munit.h
        Makefile    # Makefile in question

So my objective here is to compile the test mcts/test/list_test.c . I have read a couple different strategies to doing this. After reading a bit I adapted some things I took from Makefiles into this:

CC= gcc
SOURCE= $(wildcard ../src/*.c ./*.c)
OBJECTS= $(patsubst %.c, %.o, $(SOURCE))
INCLUDE= -I. -I../src/
CFLAGS= -std=c11 -g $(INCLUDE) -Werror -Wall

list_test: list_test.o munit.o ../src/node_queue.o
    $(CC) $(CFLAGS) $(INCLUDE) -o $@ list_test.o munit.o    ../src/node_queue.o

.c.o:
    $(CC) $(CFLAGS) -c $< -o $@

Which is the closest I've gotten in about 2 hours to working, when calling make in mcts/tests I receive the error:

list_test.o: In function `construct_test':
/home/----/mcts/tests/list_test.c:9: undefined reference to `construct'
collect2: error: ld returned 1 exit status
make: *** [Makefile:8: list_test] Error 1

Where construct is defined in mcts/src/node_queue.h. Shouldn't $(INCLUDE) ensure that the header is being included? And how can I get this to function?

Much thanks!

Upvotes: 0

Views: 55

Answers (1)

Phil Miller
Phil Miller

Reputation: 38138

For your actual error, you're reporting a linking error to an undefined symbol. If the object or function of that name were defined in node_queue.h, you would instead get a multiple definition error for construct.

What you probably are missing is that you have a declaration in that header, but no definition in node_queue.c.

Upvotes: 1

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