c - 具有 2 个源目录的 makefile make include Guard 失败

Question

我有一个项目，其来源位于两个位置。当项目链接时，它会提示函数是双重定义的(实际上不是):

cc -c -c -w -fPIC -g3 -Og -D__EMULATE_SOS__ -I../../libSOS/trunk/include -I. -I../../include -I../lib/ABCUtilSO/src -I../../Bla/trunk/src src/Meter.c -o build/x86_64-linux-gnu/obj/Meter.o
cc -c -c -w -fPIC -g3 -Og -D__EMULATE_SOS__ -I../../libSOS/trunk/include -I. -I../../include -I../lib/ABCUtilSO/src -I../../Bla/trunk/src src/PaymentHandler.c -o build/x86_64-linux-gnu/obj/PaymentHandler.o
cc -c -c -w -fPIC -g3 -Og -D__EMULATE_SOS__ -I../../libSOS/trunk/include -I. -I../../include -I../lib/ABCUtilSO/src -I../../Bla/trunk/src src/PaymentHandlerDaemon.c -o build/x86_64-linux-gnu/obj/PaymentHandlerDaemon.o
cc -c -c -w -fPIC -g3 -Og -D__EMULATE_SOS__ -I../../libSOS/trunk/include -I. -I../../include -I../lib/ABCUtilSO/src -I../../Bla/trunk/src src/PrintSocketReceiver.c -o build/x86_64-linux-gnu/obj/PrintSocketReceiver.o
cc -c -c -w -fPIC -g3 -Og -D__EMULATE_SOS__ -I../../libSOS/trunk/include -I. -I../../include -I../lib/ABCUtilSO/src -I../../Bla/trunk/src src/SerialPrinter.c -o build/x86_64-linux-gnu/obj/SerialPrinter.o
cc -c -c -w -fPIC -g3 -Og -D__EMULATE_SOS__ -I../../libSOS/trunk/include -I. -I../../include -I../lib/ABCUtilSO/src -I../../Bla/trunk/src ../../Bla/trunk/src/CheckSum.c -o build/x86_64-linux-gnu/obj/Bla/CheckSum.o
cc -c -c -w -fPIC -g3 -Og -D__EMULATE_SOS__ -I../../libSOS/trunk/include -I. -I../../include -I../lib/ABCUtilSO/src -I../../Bla/trunk/src ../../Bla/trunk/src/CheckSum.c -o build/x86_64-linux-gnu/obj/Bla/Config.o
cc build/x86_64-linux-gnu/obj/Meter.o build/x86_64-linux-gnu/obj/PaymentHandler.o build/x86_64-linux-gnu/obj/PaymentHandlerDaemon.o build/x86_64-linux-gnu/obj/PrintSocketReceiver.o build/x86_64-linux-gnu/obj/SerialPrinter.o build/x86_64-linux-gnu/obj/Bla/CheckSum.o build/x86_64-linux-gnu/obj/Bla/Config.o -o build/x86_64-linux-gnu/obj/../PaymentHandlerDaemon -lrt -lpthread -lconfig -lm -L../../libSOS/trunk/build/x86_64-linux-gnu -lSOS  -L../lib/ABCUtilLib/build/x86_64-linux-gnu -lABCUtil -L../lib/ABCUtilSO/build/x86_64-linux-gnu   -lABCMain
build/x86_64-linux-gnu/obj/Bla/Config.o: In function `CheckSum_Buffer':
/home/builder/projects/Applications/PaymentHandlerDaemon/trunk/../../Bla/trunk/src/CheckSum.c:34: multiple definition of `CheckSum_Buffer'
build/x86_64-linux-gnu/obj/Bla/CheckSum.o:/home/builder/projects/Applications/PaymentHandlerDaemon/trunk/../../Bla/trunk/src/CheckSum.c:34: first defined here
build/x86_64-linux-gnu/obj/Bla/Config.o: In function `CheckSum_Stream':
/home/builder/projects/Applications/PaymentHandlerDaemon/trunk/../../Bla/trunk/src/CheckSum.c:54: multiple definition of `CheckSum_Stream'
build/x86_64-linux-gnu/obj/Bla/CheckSum.o:/home/builder/projects/Applications/PaymentHandlerDaemon/trunk/../../Bla/trunk/src/CheckSum.c:54: first defined here
build/x86_64-linux-gnu/obj/Bla/Config.o: In function `pppfcs16':
/home/builder/projects/Applications/PaymentHandlerDaemon/trunk/../../Bla/trunk/src/CheckSum.c:125: multiple definition of `pppfcs16'
build/x86_64-linux-gnu/obj/Bla/CheckSum.o:/home/builder/projects/Applications/PaymentHandlerDaemon/trunk/../../Bla/trunk/src/CheckSum.c:125: first defined here
build/x86_64-linux-gnu/obj/Meter.o: In function `Meter_MessagePumpProc':
/home/builder/projects/Applications/PaymentHandlerDaemon/trunk/src/Meter.c:365: undefined reference to `Config_GetHardwareInfo'
collect2: error: ld returned 1 exit status
make: *** [build/x86_64-linux-gnu/obj/../PaymentHandlerDaemon] Error 1

我认为这是因为 makefile 有 2 个不同的配方要为每个目录进行编译，并且它们不共享预编译定义。

是否有更好的方法来制作具有 2 个源目录的项目？我是否应该将不同目录中的几个源添加到迷你库中，然后添加它？

生成文件:

CC ?= gcc
ARCH = $(shell $(CC) -dumpmachine)

# compile and link flags
CC_FLAGS ?= -c -w -fPIC -g3 -Og -D__EMULATE_SOS__

CC_INCLUDE = -I../../libSOS/trunk/include
CC_INCLUDE += -I. -I../../include
CC_INCLUDE += -I../lib/ABCUtilSO/src
CC_INCLUDE += -I../../Bla/trunk/src

# Libraries
LIBS := -lrt -lpthread -lconfig -lm
LIBS += -L../../libSOS/trunk/build/$(ARCH) -lSOS 
LIBS += -L../lib/ABCUtilLib/build/$(ARCH) -lABCUtil
LIBS += -L../lib/ABCUtilSO/build/$(ARCH)    -lABCMain


OUT1_DIR = build/$(ARCH)/obj
OUT2_DIR = build/$(ARCH)/obj/Bla

# result
EXEC = ${OUT1_DIR}/../PaymentHandlerDaemon

#-------------------------------------------------------------
# main sources (1)
SRC1_DIR = src
#all the sources in the srec directory will be included
SOURCES1 = $(wildcard ${SRC1_DIR}/*.c)
# deduce the object list from the source list
_OBJECTS1 = $(patsubst %.c,%.o,$(SOURCES1) )
# the replace the source directory wioth the output directory
OBJECTS1 = $(patsubst ${SRC1_DIR}%,${OUT1_DIR}%,$(_OBJECTS1) )

#-------------------------------------------------------------
# extra sources (2)
SRC2_DIR = ../../Bla/trunk/src
#SRC2_LIST = Meter.c
SRC2_LIST = CheckSum.c Config.c
#all the sources in the srec directory will be included
#SOURCES2 = $(pathsubs %,$(SRC2_DIR)/%,$(SRC2_LIST))
SOURCES2 =  $(patsubst %.c,${SRC2_DIR}/%.c,$(SRC2_LIST))
# deduce the object list from the source list
_OBJECTS2 = $(patsubst %.c,%.o,$(SOURCES2) )
# the replace the source directory wioth the output directory
OBJECTS2 = $(patsubst ${SRC2_DIR}%,${OUT2_DIR}%,$(_OBJECTS2) )

#-------------------------------------------------------------
# build receipes

all: $(EXEC)
# Main target
$(EXEC): $(OBJECTS1) $(OBJECTS2)
    $(CC) $(OBJECTS1) $(OBJECTS2) -o $@ $(LIBS)


# To obtain object files
${OUT1_DIR}%.o:${SRC1_DIR}%.c 
    @mkdir -p $(OUT1_DIR)
    $(CC) -c $(CC_FLAGS) $(CC_INCLUDE) $< -o $@

# # To obtain object files
 ${OUT2_DIR}%.o:${SOURCES2}
    @mkdir -p $(OUT2_DIR)
    $(CC) -c $(CC_FLAGS) $(CC_INCLUDE) $< -o $@


# To remove generated files
clean:
    rm -fr build/$(ARCH)


# debug.. for example use as    make -print-SRC_DIR
print-%  : ; @echo $* = $($*)

Answer 1

人们总是从多个目录构建项目。每种情况都需要不同的方法。

您发布的内容应该有效。由于 Makefile 的原因，多重定义很可能不会。我会更仔细地查看该错误。 工具链告诉您它在哪里找到这两个定义。

生成文件:

CC ?= gcc
# compile and link flags
CC_FLAGS ?= -c -w -fPIC -g3 -Og 

CC_INCLUDE += -I../../AnotherProject/src

# Libraries
LIBS := -lrt -lpthread -lconfig -lm

OUT1_DIR = build/obj
OUT2_DIR = build/obj/extra2

# result
EXEC = build/MyProgram

#-------------------------------------------------------------
# main sources (1) (everything in src directory)
SRC1_DIR = src
SOURCES1 = $(wildcard ${SRC1_DIR}/*.c)
# deduce the object list from the source list
_OBJECTS1 = $(patsubst %.c,%.o,$(SOURCES1) )
# the replace the source directory wioth the output directory
OBJECTS1 = $(patsubst ${SRC1_DIR}%,${OUT1_DIR}%,$(_OBJECTS1) )

#-------------------------------------------------------------
# extra sources (just cherry pick what i need to reuse)
SRC2_DIR = ../../AnotherProject/src
SRC2_LIST = CheckSum.c Config.c
#all the sources in the srec directory will be included
SOURCES2 =  $(patsubst %.c,${SRC2_DIR}/%.c,$(SRC2_LIST))
# deduce the object list from the source list
_OBJECTS2 = $(patsubst %.c,%.o,$(SOURCES2) )
# the replace the source directory wioth the output directory
OBJECTS2 = $(patsubst ${SRC2_DIR}%,${OUT2_DIR}%,$(_OBJECTS2) )

#-------------------------------------------------------------
# build receipes

all: debug $(EXEC)

debug: FORCE
    echo "1====" $(OBJECTS1)
    echo "2====" $(OBJECTS2)

FORCE:

# Main target
$(EXEC): $(OBJECTS1) $(OBJECTS2)
    $(CC) $(OBJECTS1) $(OBJECTS2) -o $@ $(LIBS)


# To obtain object files
${OUT1_DIR}/%.o:${SRC1_DIR}/%.c
    @mkdir -p $(OUT1_DIR)
    $(CC) -c $(CC_FLAGS) $(CC_INCLUDE) $< -o $@

# To obtain the extra object files
${OUT2_DIR}/%.o:${SRC2_DIR}/%.c
    @mkdir -p $(OUT2_DIR)
    $(CC) -c $(CC_FLAGS) $(CC_INCLUDE) $< -o $@

编辑

这是你的问题。

cc -c -c -w -fPIC -g3 -Og -D__EMULATE_SOS__ -I../../libSOS/trunk/include -I. -I../../include -I../lib/ABCUtilSO/src -I../../Bla/trunk/src ../../Bla/trunk/src/CheckSum.c -o build/x86_64-linux-gnu/obj/Bla/CheckSum.o
cc -c -c -w -fPIC -g3 -Og -D__EMULATE_SOS__ -I../../libSOS/trunk/include -I. -I../../include -I../lib/ABCUtilSO/src -I../../Bla/trunk/src ../../Bla/trunk/src/CheckSum.c -o build/x86_64-linux-gnu/obj/Bla/Config.o

您会看到它正在从同一源文件 CheckSum.c 构建 CheckSum.o 和 Config.o。因此在链接时有多个定义。这是您所采用的错误模式规则的结果。

${OUT2_DIR}%.o:${SOURCES2}