如何在将来的共享库上设置带有命令标志的断点

我试图使用 --command标志自动化 gdb 会话。我试图在一个共享库(Unix 等效于 DLL)中的一个函数上设置一个断点。我的 cmds.gdb 是这样的:

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

然而，我得到了以下信息:

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]

所以它根本不会设置断点。如何使回答“ y”为未来挂起的共享库加载设置断点？

我记得我能够做一些事情，但是想不起来是什么。

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最佳答案

Replying to myself, I'd like to give the answer that someone gave me on IRC:

(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

And so set breakpoint pending on does the trick; it is used in cmds.gdb like e.g.

set breakpoint pending on
break <source file name>:<line number>
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With no symbols.

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 <acl_delete_entry>:      stwu    r1,-32(r1)
0x2bd4 <acl_delete_entry+4>:    mflr    r0
0x2bd8 <acl_delete_entry+8>:    stw     r29,20(r1)
0x2bdc <acl_delete_entry+12>:   stw     r30,24(r1)
0x2be0 <acl_delete_entry+16>:   mr      r29,r4
0x2be4 <acl_delete_entry+20>:   li      r4,28972
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OT: In terminal it would look like this to debug Caja in one line:

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

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