GCC不会产生甚至与-g选项行号信息 [英] GCC doesn't produce line number information even with -g option

问题描述

我已经构建并从源代码安装GCC 4.8.1：

I have built and installed GCC 4.8.1 from source:

$ 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) 

和我写了一个简单的无用的程序：

And I've written a simple useless program:

$ 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();   
}

现在我编译如下：

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

然后开始gdb调试吧：

Then started debugging it with GDB:

$ 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 version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /home/calmarius/workdir/crucible/hw/hw...done.
(gdb) 

运行它，按Ctrl + C立刻：

Run it and Ctrl+C it immediately:

(gdb) run
Starting program: /home/dcsirmaz/workdir/crucible/hw/hw 
^C
Program received signal SIGINT, Interrupt.
0x00007ffff7b018b0 in __read_nocancel () at ../sysdeps/unix/syscall-template.S:82
82  ../sysdeps/unix/syscall-template.S: Nincs ilyen fájl vagy könyvtár.

我在回溯了函数名，但在我的code没有行号：

I got function names in the backtrace but no line numbers in my code:

(gdb) bt
#0  0x00007ffff7b018b0 in __read_nocancel () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007ffff7a95ff8 in _IO_new_file_underflow (fp=0x7ffff7dd4340) at fileops.c:619
#2  0x00007ffff7a9703e in _IO_default_uflow (fp=0x7ffff7dd4340) at genops.c:440
#3  0x00007ffff7a74fb6 in _IO_vfscanf_internal (s=<optimized out>, format=<optimized out>, argptr=0x7fffffffe018, errp=0x0) at vfscanf.c:620
#4  0x00007ffff7a790bd in __isoc99_scanf (format=<optimized out>) at isoc99_scanf.c:37
#5  0x000000000040054e in foo ()
#6  0x0000000000400568 in main ()

什么乱子？也许是它的东西与配置？

What's gone wrong? Maybe is it something with the configuration?

推荐答案

您GDB太旧了 - 你需要一个较新的gdb的（我用7.6），以理解GCC 4.8.1生成的调试信息

Your gdb is too old -- you need a more recent gdb (I use 7.6) to understand the debugging info generated by gcc 4.8.1

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