如何调整Makefile以使测试成为目标？

Question

我的文件夹结构如下所示：

src 
--main.cpp 
tests 
--src 
----main_test.cpp 
Makefile 

我想打一个目标像make main_test，为了能够运行测试程序为./main_test。

最初我有一个Makefile，我很久没修改过了。所以我开始修改它的内容，以创建新的main_test目标。

的Makefile

CXX = g++ 
CXXFLAGS = -O2 -Wall -std=c++11 -Iinclude 
LDFLAGS = 

EXE = main 
SRCDIR = src 
BINDIR = bin 
OBJDIR = tests/bin 

OBJECTS = $(patsubst $(SRCDIR)/%.cpp,$(BINDIR)/%.o,$(wildcard 
$(SRCDIR)/*.cpp)) 

all: $(EXE) 

$(EXE): $(BINDIR) $(OBJECTS) 
    $(CXX) $(OBJECTS) -o $(EXE) $(LDFLAGS) 

$(BINDIR)/%.o: $(SRCDIR)/%.cpp 
    $(CXX) $(CXXFLAGS) -c -MMD -o $@ $< 

include $(wildcard $(BINDIR)/*.d) 

$(OBJDIR): 
    mkdir -p $(OBJDIR) 

main_test: $(OBJDIR) tests/bin/main_test.o 
    g++ -O2 -Wall -std=c++11 tests/bin/main_test.o -o tests/main_test 

tests/bin/main_test.o: $(OBJDIR) tests/src/main_test.cpp 
    g++ -O2 -Wall -std=c++11 tests/src/main_test.cpp -o tests/bin/main_test.o 

clean_tests: 
    rm -rf $(OBJDIR) 

$(BINDIR): 
    mkdir -p $(BINDIR) 

clean: 
    rm -rf $(BINDIR) $(EXE) 

.PHONY: clean all 

不幸的是，出现了一些问题：

make main_test 
mkdir -p tests/bin 
g++ -O2 -Wall -std=c++11 tests/src/main_test.cpp -o tests/bin/main_test.o 
g++ -O2 -Wall -std=c++11 tests/bin/main_test.o -o tests/main_test 
tests/bin/main_test.o: In function `_start': 
(.text+0x1f0): multiple definition of `_start' 
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o:(.text+0x0): first defined here 
tests/bin/main_test.o: In function `_fini': 
(.fini+0x0): multiple definition of `_fini' 
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o:(.fini+0x0): first defined here 
tests/bin/main_test.o:(.rodata+0x0): multiple definition of `_IO_stdin_used' 
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o:(.rodata.cst4+0x0): first defined here 
tests/bin/main_test.o: In function `data_start': 
(.data+0x0): multiple definition of `__data_start' 
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o:(.data+0x0): first defined here 
tests/bin/main_test.o: In function `data_start': 
(.data+0x8): multiple definition of `__dso_handle' 
/usr/lib/gcc/x86_64-linux-gnu/5/crtbegin.o:(.data+0x0): first defined here 
tests/bin/main_test.o: In function `_init': 
(.init+0x0): multiple definition of `_init' 
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crti.o:(.init+0x0): first defined here 
/usr/lib/gcc/x86_64-linux-gnu/5/crtend.o:(.tm_clone_table+0x0): multiple definition of `__TMC_END__' 
tests/bin/main_test.o:(.data+0x10): first defined here 
/usr/bin/ld: error in tests/bin/main_test.o(.eh_frame); no .eh_frame_hdr table will be created. 
collect2: error: ld returned 1 exit status 
Makefile:26: recipe for target 'main_test' failed 
make: *** [main_test] Error 1 

我应该如何解决这个问题？

Answer 1

在tests/bin/main_test.o的编译规则中，您错过了-c命令行选项。

---

使用输出目录的order-only dependency，例如：

main_test: tests/bin/main_test.o | $(OBJDIR)