[英]How to expand makefile variable in prerequisites list?
我在使用变量中的文件列表时定义目标的先决条件时遇到问题,问题如下:
在我的makefile中:
... some basic defines
SOURCES=HelloC.cpp \
HelloS.cpp \
HelloI.cpp \
main.cpp
SOURCES_CLIENT=Hello_Client_impl.cpp \
HelloC.cpp
OBJECTS_SERVER_DIR=obj_s/
OBJECTS_CLIENT_DIR=obj_c/
OBJECTS_SERVER=$(addprefix $(OBJECTS_SERVER_DIR),$(SOURCES:.cpp=.o))
OBJECTS_CLIENT=$(addprefix $(OBJECTS_CLIENT_DIR),$(SOURCES_CLIENT:.cpp=.o))
EXECUTABLE_SERVER=server
EXECUTABLE_CLIENT=client
all: dirs server_exe client_exe
dirs:
@echo create dirs
$(CREATE_DIR) $(OBJECTS_SERVER_DIR)
$(CREATE_DIR) $(OBJECTS_CLIENT_DIR)
server_exe: $(EXECUTABLE_SERVER)
client_exe: $(EXECUTABLE_CLIENT)
$(EXECUTABLE_SERVER): $(OBJECTS_SERVER)
$(CXX) $^ $(LFLAGS) $(LIBS) -o $@
$(EXECUTABLE_CLIENT): $(OBJECTS_CLIENT)
$(CXX) $^ $(LFLAGS) $(LIBS) -o $@
# problematic line 1
$(OBJECTS_SERVER): $(SOURCES)
$(CXX) -c $(CPPFLAGS) -o $@ $<
# problematic line 2
$(OBJECTS_CLIENT): %.o : %.cpp
$(CXX) -c $(CPPFLAGS) -o $@ $<
运行它(作为空运行),我将得到:
$ make -n
echo create dirs
mkdir -p obj_s/
mkdir -p obj_c/
g++ -c -Wall -I. -I/usr/include/ -I/usr/include/orbsvcs/ -I/usr/include/tao/ -I/usr/include/tao/PortableServer/ -o obj_s/HelloC.o HelloC.cpp
g++ -c -Wall -I. -I/usr/include/ -I/usr/include/orbsvcs/ -I/usr/include/tao/ -I/usr/include/tao/PortableServer/ -o obj_s/HelloS.o HelloC.cpp
g++ -c -Wall -I. -I/usr/include/ -I/usr/include/orbsvcs/ -I/usr/include/tao/ -I/usr/include/tao/PortableServer/ -o obj_s/HelloI.o HelloC.cpp
g++ -c -Wall -I. -I/usr/include/ -I/usr/include/orbsvcs/ -I/usr/include/tao/ -I/usr/include/tao/PortableServer/ -o obj_s/main.o HelloC.cpp
g++ obj_s/HelloC.o obj_s/HelloS.o obj_s/HelloI.o obj_s/main.o -L/usr/lib64/ -lTAO_PortableServer -lTAO_AnyTypeCode -lTAO -lACE -o server
make: *** No rule to make target `obj_c/Hello_Client_impl.cpp', needed by `obj_c/Hello_Client_impl.o'. Stop.
problematic line 1
行将不会扩展,并且始终将第一个源文件( HelloC.cpp
)作为参数,而第二个源文件则用前缀定义。 我该如何处理以便编译? 我想在根目录中obj_c
文件,在obj_c
和obj_s
目录中有目标文件
编辑:我最初是匆忙回答了错误的问题,对此感到抱歉。 无论如何,静态模式规则是可行的方法,但是您必须考虑前缀。 代替
$(OBJECTS_CLIENT): %.o : %.cpp
采用
$(OBJECTS_CLIENT): $(OBJECTS_CLIENT_DIR)%.o : %.cpp
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