minidump-2-core: Allow user to override shared lib basedir.

minidump-2-core: Allow user to override shared lib basedir.

This CL introduces "--sobasedir" command-line option to minidump-2-core.
By default, paths to shared lib files included in generated core file are
formatted as "/var/lib/breakpad/[GUID]libFoobar.so". By using "--sobasedir",
this will be "[user-supplied-path]libFoobar.so".

This option can be used to ease debugging minidump files from developer's local
builds. By specifying "minidump-2-core --sobasedir `pwd`/out/Debug/lib/
foobar.mdmp", user can load the generated core file in gdb without setting up
the symlinks for "/var/lib/breakpad".

BUG=None

[kouhei]

Would you take a look?

I'm using this to debug minidump files generated from Chrome's content_shell
run-webkit-tests.

[Lei Zhang (chromium)]

late lgtm

I usually just manually do some post processing within gdb, but this might help
avoid some of that.

https://breakpad.appspot.com/1214002/diff/1/tools/linux/md2core/minidump-2-co...
File tools/linux/md2core/minidump-2-core.cc (right):

https://breakpad.appspot.com/1214002/diff/1/tools/linux/md2core/minidump-2-co...
tools/linux/md2core/minidump-2-core.cc:89: static std::string g_customSoBaseDir;
nit: it's weird to mix the two styles, that is, foo_bar with quxBar. I'd stick
with g_foo_bar.

[kouhei]

Thanks for your review!

Renamed the var. Would you commit this patch? I can't commit this by myself as
I'm not a breakpad committer.