A simple Makefile for unit testing with Criterion

Makefile

## Constants

CC := gcc
CFLAGS := -Wall -O2 -MMD -MP


## Variables

program := main
test-program := test-main

# Follow the file name convention like Go:
# a unit test file `foobar_test.c` for a source file `foobar.c`
test-sources := $(wildcard *_test.c)
test-objects := $(test-sources:.c=.o)
test-target-sources := $(test-sources:_test.c=.c)
test-target-objects := $(test-target-sources:.c=.o)

sources := $(filter-out $(test-sources), $(wildcard *.c))
objects := $(sources:.c=.o)

deps := $(test-objects:.o=.d) $(objects:.o=.d)


## Dependencies

$(program): $(objects)

$(test-program): LDLIBS += -lcriterion
$(test-program): $(test-objects) $(test-target-objects)
	$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@

-include $(deps)


## Task targets

.DEFAULT_GOAL := all
.PHONY: all
all: $(program)

.PHONY: clean
clean:
	-$(RM) $(program) $(test-program) *.o *.d

.PHONY: test
test: $(test-program) run-test

# private
.PHONY: run-test
run-test:
	./$(test-program) --verbose