OpenCv Makefile架构x86_64错误的未定义符号

时间:2013-06-30 17:41:33

标签: c macos opencv makefile

我很感激我在运行Makefile时遇到的这个错误。在将代码分成不同的文件之前,我编写的代码正在编译。

我有main.c文件,其中包含main函数和“color.h”。其他文件是color.h和color.c。 Color.c还包含color.h。这是我的第一个Makefile,我已经阅读了很多主题和主题,所以如果我错了请纠正我。

这是Makefile

CC = g++

CPPFLAGS = `pkg-config opencv --cflags`
LDFLAGS = `pkg-config opencv --libs`

ARCH = -arch x86_64

DEPENDENCIES = main.o color.o

# FINAL OUTPUTS
main: $(DEPENDENCIES)
    $(CC) $(ARCH) $(LDFLAGS) -o $(DEPENDENCIES) 

# MODULES
main.o: main.c color.h
    $(CC) $(ARCH) $(CPPFLAGS) -c main.c

colorOps.o: color.c
    $(CC) $(ARCH) $(CPPFLAGS) -c colorOps.c


# CLEAN
clean:
    -rm main $(DEPENDENCIES)

这是我得到的错误

Undefined symbols for architecture x86_64:
  "_main", referenced from:
      start in crt1.10.6.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
make: *** [main] Error 1

我在Mac OS X 10.8.4上运行通过Macports安装的OpenCv,正如我所说,在我分离文件之前一切正常。

非常感谢!

1 个答案:

答案 0 :(得分:1)

你几乎是对的:

您只需要将输出文件名(程序名称)添加到链接步骤:

main: $(DEPENDENCIES)
    $(CC) $(ARCH) $(LDFLAGS) -o $@ $(DEPENDENCIES) 
#                            ^^^^^
你好,你忘记了。如果您查看了命令行输出,您会看到它打印出来:

 gcc -arch x86_64 /opencv-ld-flags/ -o main.o color.o

所以它所做的就是尝试输出main.o color.o的内容,如你想要的那样:

 gcc -arch x86_64 /opencv-ld-flags/ -o main main.o color.o

$ @将在构建规则语句中的冒号(:)左侧评估目标文件(在本例中为main)。

清理文件

CC = g++

# CPPFLAGS are different from CFLAGS 
# keep CPPFLAGS name only for pre-processing flags 

CFLAGS = `pkg-config opencv --cflags`
LDFLAGS = `pkg-config opencv --libs`

ARCH = -arch x86_64

# DEPENDENCIES is a slightly confusing name
# You will see how I generate dependencies below
# So I replaced DEPENDENCIES with OBJ

SRC=main.c color.c
OBJ=$(SRC:.c=.o)

# INCLUDES flags should be of the form -Idir/path etc.
# Reason for separating this out is to help with 
# generating dependencies below

CPPFLAGS=
INCLUDES=

TARGET=main

default: $(TARGET)

$(TARGET): $(OBJ)
         $(CC) $(LDFLAGS) -o $@ $(OBJ) 

%.o: %.c
    $(CC)  $(CPPFLAGS) $(CFLAGS) $(INCLUDES) -c $< -o $@ 

# CLEAN
clean:
    -rm main $(OBJ)


# Create a rule to generate dependencies information for the makefile

.deps: $(SRC)
     $(CC) -o .deps $(CPPFLAGS) $(INCLUDES) -M -E $(SRC) 

#include dependencies
include .deps