Create coverage target in Makefile to output statement coverage with gcov

extras/fixture/test/Makefile

 CC = gcc
+ifeq ($(shell uname -s), Darwin)
+CC = clang
+endif
 #DEBUG = -O0 -g
 CFLAGS += -std=c99
 CFLAGS += -pedantic
@@ -15,21 +18,22 @@ SRC = ../src/unity_fixture.c \
       main/AllTests.c
 
 INC_DIR = -I../src -I../../../src/
+BUILD_DIR = ../build
 TARGET = ../build/fixture_tests.exe
 
 all: default noStdlibMalloc 32bits
 
-default: ../build/
-	$(CC) $(CFLAGS) $(DEFINES) $(SRC) $(INC_DIR) -o $(TARGET)
+default: $(BUILD_DIR)
+	$(CC) $(CFLAGS) $(DEFINES) $(SRC) $(INC_DIR) -o $(TARGET) -D UNITY_SUPPORT_64
 	@ echo "default build"
 	./$(TARGET)
 
-32bits: ../build/
+32bits: $(BUILD_DIR)
 	$(CC) $(CFLAGS) $(DEFINES) $(SRC) $(INC_DIR) -o $(TARGET) -m32
 	@ echo "32bits build"
 	./$(TARGET)
 
-noStdlibMalloc: ../build/
+noStdlibMalloc: $(BUILD_DIR)
 	$(CC) $(CFLAGS) $(DEFINES) $(SRC) $(INC_DIR) -o $(TARGET) -D UNITY_EXCLUDE_STDLIB_MALLOC
 	@ echo "build with noStdlibMalloc"
 	./$(TARGET)
@@ -40,13 +44,22 @@ clang89: ../build/
 		-D UNITY_EXCLUDE_STDLIB_MALLOC -std=c89 -Wno-comment ; ./$(TARGET)
 
 clangEverything:
-	clang $(CFLAGS) $(DEFINES) $(SRC) $(INC_DIR) -o $(TARGET) -m64 -Weverything
+	clang $(CFLAGS) $(DEFINES) $(SRC) $(INC_DIR) -o $(TARGET) -Weverything
 
-../build :
-	mkdir -p ../build
+$(BUILD_DIR):
+	mkdir -p $(BUILD_DIR)
 
 clean:
-	rm -f $(TARGET)
+	rm -f $(TARGET) $(BUILD_DIR)/*.gc*
+
+coverage: $(BUILD_DIR)
+	cd $(BUILD_DIR) && \
+	$(CC) $(DEFINES) $(foreach i, $(SRC), ../test/$(i)) $(INC_DIR) -o $(TARGET) -fprofile-arcs -ftest-coverage
+	rm -f $(BUILD_DIR)/*.gcda
+	./$(TARGET) > /dev/null ; ./$(TARGET) -v > /dev/null
+	cd $(BUILD_DIR) && \
+	gcov unity_fixture.c | head -3
+	grep '###' $(BUILD_DIR)/unity_fixture.c.gcov -C2 || true # Show uncovered lines
 
 # These extended flags DO get included before any target build runs
 CFLAGS += -Wbad-function-cast