Makefile:从目录编译到另一个目录 [英] Makefile: Compiling from directory to another directory

问题描述

我正在尝试使用Makefile编译位于src/code/*.cpp中的一堆.cpp文件，然后编译build/中的每个*.o，最后还生成与build/中的文件相同的可执行文件.

I am trying to use Makefile to compile a bunch of .cpp files located in src/code/*.cpp, then compile each *.o in build/, and finally generate executable with those in build/ as well.

我已经阅读了一些我尝试使用的答案，但是遇到了我不理解的问题.

I have read a couple answers that I tried to work with but have encountered issues I do not understand.

CC = g++
FLAGS = -g -c

SOURCEDIR = /src/code
BUILDDIR = build

EXECUTABLE = DesktopSpecificController
SOURCES = $(wildcard src/code/*.cpp)
OBJECTS = $(patsubst src/code/*.cpp,build/%.o,$(SOURCES))

all: dir $(BUILDDIR)/$(EXECUTABLE)

dir:
    mkdir -p $(BUILDDIR)

$(BUILDDIR)/$(EXECUTABLE): $(OBJECTS)
    $(CC) $^ -o $@

$(OBJECTS): $(BUILDDIR)/%.o : $(SOURCEDIR)/%.cpp
    $(CC) $(FLAGS) $< -o $@

clean:
    rm -f $(BUILDDIR)/*o $(BUILDDIR)/$(EXECUTABLE)

我确实收到以下错误，但我不确定为什么:

I do get the following error, and I am not sure why:

Makefile:19: target `src/code/main.cpp' doesn't match the target pattern

我还看到，当尝试构建EXECUTABLE时，它没有使用.o文件，因此在这里看来我的规则是错误的.

I also see that when trying to build the EXECUTABLE, it is not using the .o files, so it seems my rule is wrong here.

推荐答案

您的patsubst函数错误；您不能使用像*这样的shell通配符.您想要:

Your patsubst function is wrong; you can't use shell wildcard characters like *. You want:

OBJECTS = $(patsubst $(SOURCEDIR)/%.cpp,$(BUILDDIR)/%.o,$(SOURCES))

此外，您应该在各处使用SOURCEDIR和BUILDDIR，而不仅仅是在某些地方使用(否则会出现不一致的地方).最后，您的SOURCEDIR值是错误的:它不应以我期望的/开头:

Also you should be using SOURCEDIR and BUILDDIR everywhere, not just in some places (otherwise you'll get inconsistencies). And finally, your SOURCEDIR value is wrong: it should not start with / I expect:

SOURCEDIR = src/code

SOURCES = $(wildcard $(SOURCEDIR)/*.cpp)

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