Re: [gentoo-dev] Split ELF Debug (defult or not?)

[Mart Raudsepp]

On Sat, 2005-11-26 at 19:48 -0500, Dan Meltzer wrote:
> On 11/26/05, Petteri Räty <betelgeuse@g.o> wrote:
> > Ned Ludd wrote:
> > > Good afternoon,
> > >
> > > Would you be willing to give up space in $ROOT/usr/lib/debug for ELF
> > > executables by default in order to aid in better debugging by or do we
> > > want to only emit it when a FEATURE= is defined.
> > >
> > > Having a split debug pretty much obsoletes the need to add nostrip to
> > > your features in order to get debug info.
> > >
> > > Users wishing to not have debug info can simply add
> > > INSTALL_MASK="/usr/lib/debug ${INSTALL_MASK}" to make.conf or the
> > > environment unless we make it FEATURE based.
> > >
> > > I'm in favor of it enabled per default but I'd like to know what you
> > > think and why. (advantages of on/off by default etc..)
> > >
> >
> > How useful is this debug information with -fomit-frame-pointer? From
> > what I have read it makes debugging at least harder. I think most people
> > have -fomit-frame-pointer in their CFLAGS so it should not be enabled by
> > default if the debug info is not very useful any way.
>
> Well, only on x86 and other lacking arches...

Please note that gcc4 generates location lists by default (at least on
debug builds). This should allow for debugging on x86 with
-fomit-frame-pointers. Not sure how that works in relation to split ELF
debug files.

http://gnu.paradoxical.co.uk/software/gcc/gcc-4.0/changes.html

"Location lists are now generated by default when compiling with debug
info and optimization. Location lists provide more accurate debug info
about locations of variables and they allow debugging code compiled with
-fomit-frame-pointer."

Of course gcc4 isn't even ~x86 yet... ;)

-- 
With regards,
Mart Raudsepp

Project manager of wxMUD     - http://wxmud.sourceforge.net/
Developer of wxWidgets       - http://www.wxwidgets.org/
Gtk+ port maintainer of cpaf - http://cpaf.berlios.de/

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