Move test coverage generation into Makefile

Add the necessary compiler flags to the Makefile to actually make
coverage reports available locally, too.

The coverage files have to get cleaned every time before the test gets
run. Otherwise, it would sum up the coverage over multiple test runs.

.gitignore

@@ -1,5 +1,8 @@
 dunst
 *.o
+*.gcda
+*.gcno
+*.gcov
 core
 vgcore.*
 dunst.1

.travis.yml

@@ -26,8 +26,8 @@ before_install:
 
 script:
   - CFLAGS="-Werror" make all dunstify test-valgrind doc-doxygen
-  - make clean
-  - CFLAGS="-Werror -fprofile-arcs -ftest-coverage -O0" make test
+  - CFLAGS="-Werror" make clean
+  - CFLAGS="-Werror" make test-coverage
 
 matrix:
   include:

Makefile

@@ -69,8 +69,8 @@ dunst: ${OBJ} main.o
 dunstify: dunstify.o
 	${CC} -o ${@} dunstify.o ${CFLAGS} ${LDFLAGS}
 
-.PHONY: test test-valgrind
-test: test/test
+.PHONY: test test-valgrind test-coverage
+test: test/test clean-coverage-run
 	cd test && ./test
 
 test-valgrind: test/test
@@ -84,6 +84,9 @@ test-valgrind: test/test
 			--error-exitcode=123 \
 			./test
 
+test-coverage: CFLAGS += -fprofile-arcs -ftest-coverage -O0
+test-coverage: test
+
 test/test: ${OBJ} ${TEST_OBJ}
 	${CC} -o ${@} ${TEST_OBJ} ${OBJ} ${CFLAGS} ${LDFLAGS}
 
@@ -104,8 +107,8 @@ service-systemd:
 	@sed "s|##PREFIX##|$(PREFIX)|" dunst.systemd.service.in > dunst.systemd.service
 endif
 
-.PHONY: clean clean-dunst clean-dunstify clean-doc clean-tests
-clean: clean-dunst clean-dunstify clean-doc clean-tests
+.PHONY: clean clean-dunst clean-dunstify clean-doc clean-tests clean-coverage clean-coverage-run
+clean: clean-dunst clean-dunstify clean-doc clean-tests clean-coverage clean-coverage-run
 
 clean-dunst:
 	rm -f dunst ${OBJ} main.o
@@ -123,6 +126,14 @@ clean-doc:
 clean-tests:
 	rm -f test/test test/*.o
 
+clean-coverage: clean-coverage-run
+	find . -type f -name '*.gcno' -delete
+	find . -type f -name '*.gcna' -delete
+# Cleans the coverage data before every run to not double count any lines
+clean-coverage-run:
+	find . -type f -name '*.gcov' -delete
+	find . -type f -name '*.gcda' -delete
+
 .PHONY: install install-dunst install-doc \
         install-service install-service-dbus install-service-systemd \
         uninstall \