From: Sandra Loosemore <sandra@codesourcery.com>
To: Pedro Alves <palves@redhat.com>
Cc: <Paul_Koning@Dell.com>, <gbenson@redhat.com>, <gdb@sourceware.org>
Subject: Re: GDB now takes 4 minutes to start up with remote gdbserver target
Date: Fri, 24 Jul 2015 17:19:00 -0000 [thread overview]
Message-ID: <55B27348.1020104@codesourcery.com> (raw)
In-Reply-To: <55B26267.4060905@redhat.com>
On 07/24/2015 10:05 AM, Pedro Alves wrote:
> On 07/24/2015 04:27 PM, Paul_Koning@Dell.com wrote:
>
>> But having sysroot default to target is also a bad idea for lots of other people. Consider embedded systems: you presumably have stripped images there, but unstripped ones on your build host.
>
> But in that scenario, with the old default sysroot, how was gdb finding
> the binaries on the build host? The binaries on the equilalent locations
> on the host's root will certainly not match the embedded/target system's.
> In that scenario, you must have been pointing the "set sysroot" somewhere
> local? And if you do that, nothing changes in 7.10, gdb will still access
> the files on the local filesystem.
>
> From the discussion so far, it seems that the only case that ends up
> regressing is the case where the host and target share both the
> filesystem, and the host/target paths match. I don't know off hand how to
> make gdb aware of that automatically.
There's also the case where the host and target sysroot locations do not
match at all. As I said, this used to work reasonably well for
application debugging, where the user isn't interested in debugging
shared libraries and doesn't care if the shared library symbol
information isn't available to GDB. It used to print a helpful message
suggesting using "set sysroot" if the user wants the shared library
information, instead of hanging on startup with no indication of what
the trouble is or how to fix it. I can't see the new default behavior
as an improvement over the old.
> That seems like enough of a special case that could well be handled
> by an explicit "set sysroot /" in e.g., the toolchain's system-gdbinit, or
> by building gdb with "--with-sysroot=/".
There are a bunch of possible workarounds for this, but why can't we
make GDB "just work" by default, as it used to, instead of requiring
users to build GDB differently or install a workaround or issue extra
commands manually that they didn't used to need at all?
-Sandra
next prev parent reply other threads:[~2015-07-24 17:19 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-23 23:21 Sandra Loosemore
2015-07-24 2:39 ` Sandra Loosemore
2015-07-24 8:52 ` Gary Benson
2015-07-24 13:59 ` Sandra Loosemore
2015-07-24 14:08 ` Paul_Koning
2015-07-24 15:11 ` Gary Benson
2015-07-24 15:27 ` Paul_Koning
2015-07-24 16:36 ` Pedro Alves
2015-07-24 16:58 ` Paul_Koning
2015-07-28 22:12 ` Pedro Alves
2015-07-24 17:19 ` Sandra Loosemore [this message]
2015-07-27 12:22 ` Gary Benson
2015-07-28 9:25 ` Gary Benson
2015-07-28 15:22 ` Sandra Loosemore
2015-07-29 10:00 ` Gary Benson
2015-07-28 15:38 ` Gary Benson
2015-07-28 17:04 ` Doug Evans
2015-07-28 22:13 ` Pedro Alves
2015-07-29 1:32 ` Sandra Loosemore
2015-07-26 20:03 ` Frank Ch. Eigler
2015-07-26 20:06 ` Jan Kratochvil
2015-07-26 20:50 ` Frank Ch. Eigler
2015-07-28 16:55 ` Doug Evans
2015-07-28 22:14 ` Pedro Alves
2015-07-29 10:39 ` Gary Benson
2015-07-29 16:54 ` Jan Kratochvil
2015-07-29 10:15 ` Gary Benson
2015-07-24 10:34 ` Gary Benson
2015-07-24 16:05 ` Sandra Loosemore
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