gdb catchpoints

Not sure how the hell didn't know about this until now, but these gdb catchpoints are pretty nifty.

http://sourceware.org/gdb/onlinedocs/gdb/Set-Catchpoints.html

You can do something like "catch load libbfd.so" and you'll hit a breakpoint in dl-debug.c when that .so is loaded.

(gdb) catch load libbfd.so
Catchpoint 1 (load)
(gdb) r
Starting program: /home/mikesart/data/src/blah_dyldrendezvous_crash/build/blah
hello world

Catchpoint 1
  Inferior loaded /usr/lib/libbfd.so
    /lib/x86_64-linux-gnu/libz.so.1
__GI__dl_debug_state () at dl-debug.c:77
(gdb) bt
#0  __GI__dl_debug_state () at dl-debug.c:77
#1  in dl_open_worker
#2  _dl_catch_erroroperate
#3  in _dl_open
#4  in dlopen_doit
#5  in _dl_catch_error
#6  in _dlerror_run
#7  in __dlopen
#8  in main

There are catchpoints for calls to exec, fork, syscalls, and signals that could all be useful as well.

I don't see anything like this in lldb - adding to the task list...