代码之家 › 专栏 › 技术社区 › Manfredo

Makefile:无规则生成目标:如何设置正确的规则?

build makefile c++

Manfredo · 技术社区 · 6 年前

我有一个项目,我正试图创建一个生成文件。文件夹结构如下所示:

|-- bin
|-- build
|-- Makefile
|-- src
|   |-- some_files.cpp
|   |-- some_files.h
|   |-- ForestFactory
|   |-- MMParSet
|   |-- century
|       |-- century_carbon.cpp
|       |-- century_carbon.h
|   `-- grass
`-- src_multithread
    |-- __history

this reference 创建生成文件。我的Makefile是

CC := g++

SRCDIR := src
BUILDDIR := build
TARGETDIR := bin
INSTALLBINDIR := /usr/local/bin
TARGET := bin/formind

# CPP files
SOURCES := $(shell find $(SRCDIR) -type f -name *.cpp)
# remove the src path and add the build path and the .o extension
OBJECTS := $(addprefix $(BUILDDIR)/,$(patsubst %.cpp,%.o,$(notdir $(SOURCES))))

CFLAGS := -std=c++11 -stdlib=libc++

INC := -I/usr/local/include -I $(SRCDIR) -I $(SRCDIR)/century -I $(SRCDIR)/grass -I $(SRCDIR)/MMParSet -I $(SRCDIR)/ForestFactory

$(TARGET): $(OBJECTS)
    @mkdir -p $(TARGETDIR)
    @echo " Linking..."
    @echo " $(CC) $^ -o $(TARGET)"
    $(CC) $^ -o $(TARGET)

$(BUILDDIR)/%.o: $(SRCDIR)/%.cpp
    @mkdir -p $(BUILDDIR)
    @echo " $(CC) $(CFLAGS) $(INC) -c -o $@ $<"
    $(CC) $(CFLAGS) $(INC) -c -o $@ $<

clean:
    @echo " Cleaning...";
    @echo " $(RM) -r $(BUILDDIR) $(TARGET)"
    $(RM) -r $(BUILDDIR) $(TARGET)


.PHONY: clean

当我试着 make 我收到以下错误消息:

make: *** No rule to make target `build/century_carbon.o', needed by `bin/formind'.  Stop.

OBJECTS 变量应该包含最终对象文件的完整路径,因此

$SOURCES = src/century/century_carbon.cpp ... src/for_branching.cpp ... src/grass/grass_log.cpp ...

$OBJECTS = build/century_carbon.o ... build/for_branching.o ... build/grass_log.o ...

1 回复 | 直到 6 年前

Joseph Quinsey Taseen 6 年前

问题在于 嵌套的 源目录 century . 如果添加到makefile:

info:
    @echo " Info..."
    @echo " SOURCES = $(SOURCES)"
    @echo " OBJECTS = $(OBJECTS)"

然后 make info 给予:

  Info...
  SOURCES = src/century/century_carbon.cpp src/some_files.cpp
  OBJECTS = build/century_carbon.o build/some_files.o

make 会告诉我们:

make: *** No rule to make target 'build/century_carbon.o', needed by 'bin/formind'.  Stop.

明确规定:

$(BUILDDIR)/%.o: $(SRCDIR)/century/%.cpp
    @mkdir -p $(BUILDDIR)
    $(CC) $(CFLAGS) $(INC) -c -o $@ $<

另一种解决办法是 VPATH

VPATH = src:src/century

同时移除 $(SRCDIR)/

$(BUILDDIR)/%.o: %.cpp
    @mkdir -p $(BUILDDIR)
    $(CC) $(CFLAGS) $(INC) -c -o $@ $<

更新:

使用 vpath 而不是 ,以便更精确地控制搜索。
虚拟路径 / .

这是惊人的简单:只要更换我的硬编码符合:

vpath %.cpp $(sort $(dir $(SOURCES)))