C Makefile链接器错误- [英] C Makefile linker error -

问题描述

我在下面编写了Makefile.编译期间出现以下错误.我不确定IBS是什么?它缺少LIBS中的L还是什么?

I'v written the Makefile below. I'm getting the following error during compilation. I'm not sure what IBS is? Is it missing the L from LIBS or something?

关注的问题:

这是目录结构.

.
├── Makefile
└── src
    ├── include
    │   └── utils.h
    ├── main.c
    └── utils.c

但是，当我运行make时，这是输出.它似乎没有拾取并生成文件utils.c吗?

However, when I run make, this is the output. It doesn't seem to be picking up and building the file utils.c?

cc -I./src -I./src/include -I/usr/local/include/upm -MMD -MP -c src/main.c -o build/./src/main.c.o.o

cc -I./src -I./src/include -I/usr/local/include/upm -MMD -MP -c src/main.c -o build/./src/main.c.o.o

TARGET_EXEC ?= app.out

BUILD_DIR ?= ./build
SRC_DIRS ?= ./src


SRCS := $(shell find $(SRC_DIRS) -name *.cpp -or -name *.c -or -name *.s)
OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
DEPS := $(OBJS:.o=.d)

INC_DIRS := $(shell find $(SRC_DIRS) -type d)
INC_FLAGS := $(addprefix -I,$(INC_DIRS)) -I/usr/local/include/upm

CPPFLAGS ?= $(INC_FLAGS) -MMD -MP 

$(BUILD_DIR)/$(TARGET_EXEC): $(OBJS)
    $(CC) $(OBJS) -o $@ $(LDFLAGS)

LD_FLAGS = -L/usr/local/lib/upm -L/usr/lib/rabbitmq 

LIBS = -lrabbitmq -lupmc-rn2483 -lupmc-rn2903 -lupmc-utilities

# c source
$(BUILD_DIR)/%.c.o: %.c
    $(MKDIR_P) $(dir $@)
    $(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@.o
    $(CC) $(LD_FLAGS)    $@.o -o $@ $LIBS



.PHONY: clean

clean:
    $(RM) -r $(BUILD_DIR)

-include $(DEPS)

MKDIR_P ?= mkdir -p

推荐答案

     $(CC) $(LD_FLAGS)    $@.o -o $@ $LIBS
#   wrong                            ^^^^^

是错误的. Makefile变量需要括号:$(LIBS)，并且您的$LIBS被理解为$(L)IBS，并且您没有任何L变量(因此$LIBS扩展为IBS，因为$L扩展为空)

is wrong. Makefile variables need parenthesis: $(LIBS) and your $LIBS is understood as $(L)IBS and you don't have any L variable (so $LIBS expands to IBS since $L expands to nothing)

顺便说一句，您可能已将make --trace或翻拍与-x一起使用来发现错误

BTW, you could have used make --trace or remake with -x to find that bug

关于已编辑的问题，我相信对于这么小的程序拥有如此复杂的源代码树可能是错误的(通常来说，少于几十万行的小程序在平面源代码树中更容易处理) ，这是一个同时包含*.c和*.h源文件的目录.但是，您可能会考虑

Regarding the edited question, I believe that you might be wrong in having such a complex source tree for such a small program (generally speaking, small programs of less than a few dozen thousands lines are simpler to deal in a flat source tree, that is a single directory containing both *.c and *.h source files). However, you might consider

 INC_DIRS = $(wildcard */include)

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