Ubuntu Mate上的WiringPi

Question

我写了这段代码，让Ubuntu Mate OS中的Raspberry Pi 3上的LED闪烁：

#include <wiringPi.h>

int main(void){
    wiringPiSetup();
    pinMode(0, OUTPUT);
    while(1){
        digitalWrite(0, HIGH);
        delay(500);
        digitalWrite(0, LOW);
        delay(500);
    }
    return 0;
}

我尝试使用以下命令编译代码：

gcc -o blink blinky.c -lwiringPi

但它无法编译，并给出了以下错误：

/usr/lib/gcc/arm-linux-gnueabihf/5/../../../../lib/libwiringPi.so: undefined reference to `crypt'
/usr/lib/gcc/arm-linux-gnueabihf/5/../../../../lib/libwiringPi.so: undefined reference to `rint'
/usr/lib/gcc/arm-linux-gnueabihf/5/../../../../lib/libwiringPi.so: undefined reference to `pthread_join'
/usr/lib/gcc/arm-linux-gnueabihf/5/../../../../lib/libwiringPi.so: undefined reference to `pthread_create'
/usr/lib/gcc/arm-linux-gnueabihf/5/../../../../lib/libwiringPi.so: undefined reference to `pow'
/usr/lib/gcc/arm-linux-gnueabihf/5/../../../../lib/libwiringPi.so: undefined reference to `shm_open'
/usr/lib/gcc/arm-linux-gnueabihf/5/../../../../lib/libwiringPi.so: undefined reference to `pthread_cancel'
collect2: error: ld returned 1 exit status

我为WiringPi安装了所有必需的东西，但我找不到上述错误的解决方案。

Answer 1

尝试使用类似下面这样的命令：

gcc -O3 -Wall -I/usr/local/include -Winline -pipe -L/usr/local/lib temperature.c  -lwiringPi -lwiringPiDev -lpthread -lm -lcrypt -lrt -o temperature

您可以将自己的文件替换为temperature.c和temperature输出文件名。

此调用取自wiringPi examples目录中的Makefile。

Answer 2

定义：add_definitions( -lwiringPi )和target_link_libraries(${PROJECT_NAME}_class ${wiringPi_LIB} -lcrypt -lrt)

in CMakeLists.txt为我做了这件事