gdbserver + libiberty?

gdbserver + libiberty?

[Doug Evans]

Hi.  Is there any reason to not link gdbserver with libiberty?
I'm working on a patch where that would be useful.

Re: gdbserver + libiberty?

[Jim Blandy]

dje at google.com (Doug Evans) writes:
> Hi.  Is there any reason to not link gdbserver with libiberty?
> I'm working on a patch where that would be useful.

gdbserver would need to be linked with a libiberty compiled for the
target, obviously.

Re: gdbserver + libiberty?

[Doug Evans]

On Jan 15, 2008 10:07 AM, Jim Blandy <jimb@codesourcery.com> wrote:
>
> dje at google.com (Doug Evans) writes:
> > Hi.  Is there any reason to not link gdbserver with libiberty?
> > I'm working on a patch where that would be useful.
>
> gdbserver would need to be linked with a libiberty compiled for the
> target, obviously.

This part I'm not clear on.  I found this in gdb/configure.ac:

# We only build gdbserver automatically in a native configuration.
if test "$gdb_native" = "yes"; then
  AC_MSG_CHECKING(whether gdbserver is supported on this host)
  if test "x$build_gdbserver" = xyes; then
    AC_MSG_RESULT(yes)
    AC_CONFIG_SUBDIRS(gdbserver)
  else
    AC_MSG_RESULT(no)
  fi
fi

I couldn't find any docs on building gdbserver for cross targets (i.e
--host != --target), got any pointers?  It's only useful for targets
that otherwise can be build natively (AIUIp.  Would gdbserver ever be
built with CC_FOR_TARGET whereas gdb got built with CC?  I can't find
any code to handle this in gdb or the top level configury.  And if not
would gdbserver ever need a different libiberty than the one gdb is
linked with?

Re: gdbserver + libiberty?

[Paul Koning]

>>>>> "Doug" == Doug Evans <dje@google.com> writes:

 Doug> # We only build gdbserver automatically in a native
 Doug> configuration. ...

 Doug> I couldn't find any docs on building gdbserver for cross
 Doug> targets (i.e --host != --target), got any pointers? 

Even if the scripts don't currently do that (or not by default), it
would be good not to add additional reasons for it to be hard.  I've
certainly done cross-builds of gdbserver, and they work fine.

	  paul

Re: gdbserver + libiberty?

[Daniel Jacobowitz]

On Tue, Jan 15, 2008 at 10:41:37AM -0800, Doug Evans wrote:
> I couldn't find any docs on building gdbserver for cross targets (i.e
> --host != --target), got any pointers?  It's only useful for targets
> that otherwise can be build natively (AIUIp.  Would gdbserver ever be
> built with CC_FOR_TARGET whereas gdb got built with CC?  I can't find
> any code to handle this in gdb or the top level configury.  And if not
> would gdbserver ever need a different libiberty than the one gdb is
> linked with?

You can build gdbserver by running src/gdb/gdbserver/configure and make;
the top level scripts are not involved at all, so you don't get a
libiberty.  We need to not break that.  If you need libiberty for a
good reason, then we can talk about how to build it.

-- 
Daniel Jacobowitz
CodeSourcery

Re: gdbserver + libiberty?

[Jim Blandy]

Daniel Jacobowitz <drow at false.org> writes:
> On Tue, Jan 15, 2008 at 10:41:37AM -0800, Doug Evans wrote:
>> I couldn't find any docs on building gdbserver for cross targets (i.e
>> --host != --target), got any pointers?  It's only useful for targets
>> that otherwise can be build natively (AIUIp.  Would gdbserver ever be
>> built with CC_FOR_TARGET whereas gdb got built with CC?  I can't find
>> any code to handle this in gdb or the top level configury.  And if not
>> would gdbserver ever need a different libiberty than the one gdb is
>> linked with?
>
> You can build gdbserver by running src/gdb/gdbserver/configure and make;
> the top level scripts are not involved at all, so you don't get a
> libiberty.  We need to not break that.

This is arcane magic; could we document it somewhere?  gdb.texinfo's
Appendix B describes "Installing GDB".  gdb/README also documents
configuration options, and has a section on gdbserver.

Re: gdbserver + libiberty?

[Daniel Jacobowitz]

On Wed, Jan 16, 2008 at 01:41:43PM -0800, Jim Blandy wrote:
> This is arcane magic; could we document it somewhere?  gdb.texinfo's
> Appendix B describes "Installing GDB".  gdb/README also documents
> configuration options, and has a section on gdbserver.

It's in gdbserver/README currently.

-- 
Daniel Jacobowitz
CodeSourcery

Re: gdbserver + libiberty?

[Jim Blandy]

Daniel Jacobowitz <drow at false.org> writes:
> On Wed, Jan 16, 2008 at 01:41:43PM -0800, Jim Blandy wrote:
>> This is arcane magic; could we document it somewhere?  gdb.texinfo's
>> Appendix B describes "Installing GDB".  gdb/README also documents
>> configuration options, and has a section on gdbserver.
>
> It's in gdbserver/README currently.

That says:

  ... building gdbserver automatically as part of building a whole
  tree of tools does not currently work if cross-compilation is
  involved (we don't get the right CC in the Makefile, to start
  with)).

If this were made to work right, would that make it easier to use a
target libiberty?

Re: gdbserver + libiberty?

[Daniel Jacobowitz]

On Wed, Jan 16, 2008 at 02:56:24PM -0800, Jim Blandy wrote:
> 
> Daniel Jacobowitz <drow at false.org> writes:
> > On Wed, Jan 16, 2008 at 01:41:43PM -0800, Jim Blandy wrote:
> >> This is arcane magic; could we document it somewhere?  gdb.texinfo's
> >> Appendix B describes "Installing GDB".  gdb/README also documents
> >> configuration options, and has a section on gdbserver.
> >
> > It's in gdbserver/README currently.
> 
> That says:
> 
>   ... building gdbserver automatically as part of building a whole
>   tree of tools does not currently work if cross-compilation is
>   involved (we don't get the right CC in the Makefile, to start
>   with)).
> 
> If this were made to work right, would that make it easier to use a
> target libiberty?

I think we could do it by moving gdbserver to the top level, but I
don't much want to do that while src still uses CVS.

-- 
Daniel Jacobowitz
CodeSourcery