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Re: Debugging 32bit apps with 64bit target gdb
On Mon, 2011-05-23 at 00:40 +0200, Mark Kettenis wrote:
> > From: Paul Smith <psmith@gnu.org>
> > Date: Sun, 22 May 2011 18:25:10 -0400
> >
> > A short summary, I'm trying to see if I can build one GDB executable
> > with all these properties:
> >
> > * Is a 32bit application so it can run on both 32bit and 64bit
> > systems
> > * Can debug 32bit applications
> > * Can debug 64bit applications (when run on a 64bit system
> > obviously)
> > * If I can get it to debug a 64bit core file when running on a
> > 32bit system (with --sysroot pointing to a 64bit sysroot of
> > course) that would be awesome.
> >
> > I'm only concerned with x86 architectures (for now?)
> >
> > Is such a thing possible?
>
> I believe this is possible on Solaris. It is possible on powerpc
> Linux. It is *not* possible on Linux. Not GDB's fault. The x86
> Linux kernel simply doesn't provide the necessary support.
Yes, I'm using Linux. Sorry to forget that detail.
Interesting. I could have sworn I've seen this work before but maybe
there was simply magic going on behind the scenes (gdb was a shell
script that invoked a correct version based on the target architecture,
or something).
So, I need to build a 32bit GDB to debug 32bit apps and a 64bit GDB to
debug 64bit apps?
Thanks!
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