1
我有gdb问题,它并没有停在一个函数中。你能解释调用strcpy之后为什么以及如何停止程序吗?如何使用共享库函数在gdb中设置断点
[email protected]:~/poligon$ gdb ./char_array2
GNU gdb (GDB) 7.2
Copyright (C) 2010 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 "i686-pc-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/grzes/poligon/char_array2...done.
(gdb) list
1 #include <stdio.h>
2 #include <string.h>
3
4 int main() {
5 char str_a[20];
6 printf("ssss");
7 strcpy(str_a, "Hello, world!\n");
8 printf(str_a);
9 }
10
(gdb) break main
Breakpoint 1 at 0x8048465: file char_array2.c, line 4.
(gdb) run
Starting program: /home/grzes/poligon/char_array2
Breakpoint 1, main() at char_array2.c:4
4 int main() {
(gdb) break strcpy
Breakpoint 2 at 0x1a1205
(gdb) cont
Continuing.
ssssHello, world!
Program exited with code 016.
(gdb) q
[email protected]:~/poligon$
是的,它可以帮助 - 使用gcc的交换机-fno-内置从这样的行为阻止@ – user480162 2010-10-19 08:59:02
编译user480162 strcpy的变化将memcpy的优化目的:GCC会自动在一定的使用'__builtin_strcpy'而不是调用标准库'strcpy',除非用'-fno-builtin'编译。使用'gcc -S'来查看您的案例中正在生成的内容。 – 2010-10-19 09:01:39