翻译：How to set breakpoints on future shared libraries with a command flag

Stack overflow地址：c++ - How to set breakpoints on future shared libraries with a command flag - Stack Overflow

翻译：

我正在尝试使用 --command标识自动化一个gdb会话。我尝试设置一个断点在一个共享库的函数中（相当于windows的dll）。我的gdb命令像下面这样：

set args /home/shlomi/conf/bugs/kde/font-break.txt

b IA__FcFontMatch

r

然而，我得到了下面几点：

shlomi:~/progs/bugs-external/kde/font-breaking$ gdb --command=cmds.gdb...

GNU gdb 6.8-2mdv2009.0 (Mandriva Linux release 2009.0)

Copyright (C) 2008 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later

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 "i586-mandriva-linux-gnu"...

(no debugging symbols found)

Function "IA__FcFontMatch" not defined.

Make breakpoint pending on future shared library load? (y or [n]) [answered N; input not from terminal]

所以它最终没有设置断点。我改怎么做让它默认回答y来设置断点，等待在未来的共享库加载上。

我记得我可以做些什么，但是什么也想不起来。

---

Answers1：

回复我自己，我想要给出一个答案，这是一个人在 IRC上给我的答案：

(gdb) apropos pending

actions -- Specify the actions to be taken at a tracepoint

set breakpoint -- Breakpoint specific settings

set breakpoint pending -- Set debugger's behavior regarding pending breakpoints

show breakpoint -- Breakpoint specific settings

show breakpoint pending -- Show debugger's behavior regarding pending breakpoints

因此，set breakpoint pending on是骗人的；它在 cmds.gdb中像下面这样：

set breakpoint pending on

break :

---

Answers2：

OT：在终端中，它看起来像下面这样一行来调试Caja：

gdb -ex "set breakpoint pending on" -ex "break gdk_x_error" -ex run --args caja --sync

---

Answers3：

没有任何符号。

objdump -t /lib/libacl.so

SYMBOL TABLE:

no symbols

objdump -T /lib/libacl.so

...

00002bd0 g    DF .text  000000d0  ACL_1.0    acl_delete_entry

...

(gdb) break 0x0002bd0

(gdb) x/20i acl_delete_entry

0x2bd0 :      stwu    r1,-32(r1)

0x2bd4 :    mflr    r0

0x2bd8 :    stw    r29,20(r1)

0x2bdc :  stw    r30,24(r1)

0x2be0 :  mr      r29,r4

0x2be4 :  li      r4,28972