C 语言程序调试常用方法与技巧 | 极客日志

C 语言程序调试常用方法与技巧 | 极客日志

gcc -g -O0 -o program program.c

sudo apt-get install gdb # Ubuntu/Debian 系统
brew install gdb # macOS 系统

gdb program

#include <stdio.h>

int main() {
    int x = 10;
    int y = 20;
    int z = x + y;
    printf("x = %d, y = %d, z = %d\n", x, y, z);
    return 0;
}

#include <stdio.h>
#include <assert.h>

int main() {
    int x = 10;
    int y = 20;
    assert(x > 0 && y > 0);
    int z = x + y;
    printf("z = %d\n", z);
    return 0;
}

gdb program core

break 10 if x > 10

watch *0x12345678

info threads # 查看线程信息
thread 2 # 切换到线程 2

#include <stdio.h>

int main() {
    int x = 10;
    int y = 20;
    int z = x + y;
    printf("z = %d\n", z);
    return 0;
}

program.c:7:1: error: expected ';' before 'printf' printf("z = %d\n", z); ^~~~~~

#include <stdio.h>

int main() {
    int x = 10;
    int y = 20;
    int z = x - y;
    printf("z = %d\n", z);
    return 0;
}

z = 30

z = -10

#include <stdio.h>

int main() {
    int x = 10;
    int y = 0;
    int z = x / y;
    printf("z = %d\n", z);
    return 0;
}

Floating point exception (core dumped)