我的 C 程序有问题：出现编译错误

Question

我正在使用 Yocto 项目交叉编译器来编译我的 C 代码。

但由于某些原因我有编译错误。

这是我的 C 代码：

#include <stdio.h>
#include <stdlib.h>
#include "/home/gaston/linux4sam/poky/build-microchip/tmp/sysroots-components/cortexa5hf-neon/mraa/usr/include/mraa.hpp"

/* MRAA does not yet understand GPIO-A - GPIO-L       */
/* Linaro will add this                   */
/* What Mraa does understand is pin out numbers so,     */
/* pin 23 is GPIO-A and pin 25 is GPIO-C          */

#define LED 10
#define BUTTON 29

bool running = true;
bool led_state = false;
int last_touch;
void sig_handler(int signo)
{
    if (signo == SIGINT)
        running = false;
}

int main(int argc, char* argv[])
{
    mraa::Result ret;
    int touch;

    mraa::Gpio* touch_gpio = new mraa::Gpio(BUTTON);
    if (touch_gpio == NULL){
        return mraa::ERROR_UNSPECIFIED;
    }
    mraa::Gpio* led_gpio = new mraa::Gpio(LED);
    if (led_gpio == NULL){
        return mraa::ERROR_UNSPECIFIED;
    }

    signal(SIGINT, sig_handler);

    if ((ret = touch_gpio->dir(mraa::DIR_IN))!= mraa::SUCCESS){
        return ret;
    }
    if ((ret = led_gpio->dir(mraa::DIR_OUT))!= mraa::SUCCESS){
        return ret;
    }

    led_gpio->write(led_state);

    while (running) {
        touch = touch_gpio->read();
        if (touch == 1 && last_touch == 0) {
            led_state = !led_state;
            ret = led_gpio->write(led_state);
            usleep(100000);
        }
        last_touch = touch;
        usleep(1);
    }
    delete led_gpio;
    delete touch_gpio;
    return ret;
}

这是生成文件：

#CC=arm-poky-linux-gnueabi-gcc -march=armv7-a -marm -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a5 --sysroot=/opt/poky-atmel/2.5.3/sysroots/cortexa5hf-neon-poky-linux-gnueabi
#CC="gcc"

all: last1.o
        ${CC} last1.o -o target_bin -lmraa

last1.o: last1.c
        ${CC} -I . -c last1.c

clean:
        rm -rf *.o
        rm target_bin

这就是我运行 make all 时得到的结果：

In file included from /home/gaston/linux4sam/poky/build-microchip/tmp/sysroots-components/cortexa5hf-neon/mraa/usr/include/mraa/common.hpp:28:0, from /home/gaston/linux4sam/poky/build-microchip/tmp/sysroots-components/cortexa5hf-neon/mraa/usr/include/mraa.hpp:27, from last1.c:4:

/home/gaston/linux4sam/poky/build-microchip/tmp/sysroots-components/cortexa5hf-neon/mraa/usr/include/mraa/types.hpp:32:1: error: unknown type name ‘namespace’ namespace mraa ^~~~~~~~~

/home/gaston/linux4sam/poky/build-microchip/tmp/sysroots-components/cortexa5hf-neon/mraa/usr/include/mraa/types.hpp:33:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘attribute’ before ‘{’ token { ^

In file included from /home/gaston/linux4sam/poky/build-microchip/tmp/sysroots-components/cortexa5hf-neon/mraa/usr/include/mraa.hpp:27:0, from last1.c:4: /home/gaston/linux4sam/poky/build-microchip/tmp/sysroots-components/cortexa5hf-neon/mraa/usr/include/mraa/common.hpp:29:10: fatal error: string: No such file or directory #include ^~~~~~~~

compilation terminated. Makefile:8: recipe for target 'last1.o' failed make: *** [last1.o] Error 1

Answer 1

您正在使用 C++ 编译器编译用 C 编写的代码。
只需将 .c 文件更改为 .cpp 文件，如果您使用的是 Unix 系统，则使用 g++ 而不是 gcc 进行编译。

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