相关疑难解决方法(0)

我从源代码构建并安装了GCC 4.8.1:

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-unknown-linux-gnu/4.8.1/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ./configure --disable-multilib
Thread model: posix
gcc version 4.8.1 (GCC) 

我写了一个简单无用的程序:

$ cat hw.c
#include <stdio.h>

void foo()
{
    int a;
    scanf("%d", &a); /* So I can press ctrl+c here. */
    printf("Hello world!\n");
}

int main()
{
    foo();   
}

现在我编译这个:

$ gcc -g -O0 hw.c -o hw

然后开始用GDB调试它:

$ gdb hw
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL …

我对gdb有些麻烦.这是我在名为main.cpp的单个文件中的代码

#include <iostream>

void myfunc();

int main(){
    char msg[] = "Hello World!";
    myfunc();

    std::cout << msg << std::endl;

    return 0;
}

void myfunc(){
    int boo = 16;
}

我用这个命令来编译这段代码:

g++ -g -Wall main.cpp -o foo

接下来,我使用了gdb:

$ gdb foo
(gdb) start
Temporary breakpoint 1 at 0x80487c3
Starting program: /home/laptop/workspace/foo 

Temporary breakpoint 1, 0x080487c3 in main ()
(gdb) s
Single stepping until exit from function main,
which has no line number information.
Hello World!
__libc_start_main (main=0x80487c0 <main>, argc=1, ubp_av=0xbffff3a4, init=0x80488b0 <__libc_csu_init>, …