linux下使用动态库

Makefile

ARGET  = usbcan_tool

CC       ?= gcc
CFLAGS   ?= -Wall -g

CXX      ?= g++
CXXFLAGS ?= -Wall -g

COBJS           = \
                ./main.o \
                ./usbcan.o

CPPOBJS         =


OBJS      = $(COBJS) $(CPPOBJS)
LIBS      = -lpthread -L./lib -lcontrolcan
INCLUDES  = -L./include


$(TARGET): $(OBJS)
        $(CXX) $(CXXFLAGS) $(LDFLAGS) $^ $(LIBS) -o $(TARGET)

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

$(CPPOBJS): %.o: %.cpp
        $(CXX) $(CXXFLAGS) -c $(INCLUDES) $< -o $@

clean:
        rm -rf $(OBJS) *.o $(TARGET) *log

.PHONY: clean

看目录结果

drwx------ 2 flinn flinn 4096  4月  2 13:25 include
drwx------ 2 flinn flinn 4096  4月  2 13:25 lib
-rw------- 1 flinn flinn  432  4月  2 13:25 main.c
-rw------- 1 flinn flinn  514  4月  2 13:25 Makefile
drwx------ 2 flinn flinn 4096  4月  2 13:25 si
-rw------- 1 flinn flinn 2513  4月  2 13:25 usbcan.c

在lib目录下有动态链接库libcontrolcan.so

最后需要制定动态链接库的地址，否则提示错误

LD_LIBRARY_PATH=/home/flinn/usbcan_tool/lib
export LD_LIBRARY_PATH

USBCAN需要root权限才能访问底层usb驱动， 需要新建一个规则：

sudo vim /etc/udev/rules.d/99-myusb.rules

##
ACTION=="add",SUBSYSTEMS=="usb", ATTRS{idVendor}=="04d8", ATTRS{idProduct}=="0053",
GROUP="users", MODE="0777"