Re: [RFC PATCH 0/8] sysroot support

[Thierry Reding]

* Charles Wilson wrote:
> On 7/22/2010 2:36 PM, Paolo Bonzini wrote:
> > This patch series is on top of 04329d83555b5f8d2fd02428418a79ea392b2d91.
> > The basic idea is to look for -L= and -R= to expand the sysroot, and for
> > the sysroot to remove it in .la files.
> > 
> > Some missing testcases are hinted at in sysroot.at.  I think they would
> > already work with the patch as is.  However, I haven't retested this at
> > all, so I trust my old runs from mid 2009 which were done with Fedora 12
> > and its mingw cross-compilation environment.
> > 
> > Sorry for the delay.
> 
> Thanks for the patch.  I haven't been able to test it yet, but looking
> through it, it appears that the 'use case' is:
> 
> on $build, when building a libtoolized project, you configure as:
> 
> path/to/configure --build=$build --host=$host \
>       --prefix=$sysroot_of_compiler$prefix_for_host \
>       ...
> 
> and then compile and install as usual (somehow arranging that -sysroot
> is passed to libtool, whenever appropriate).  Is that correct?
> 
> 
> The reason I ask, is it sure would be nice if one could instead do this:
> 
> path/to/configure --build=$build --host=$host \
>       --prefix=$prefix_for_host \
>       ...
> 
> and the compile as usual -- but when installing, do
> 
> make install prefix=$sysroot_of_compiler$prefix_for_host
> 
> (again, somehow arranging for libtool to get the -sysroot option).
> 
> This way, there is little danger that the value of $sysroot_of_compiler
> would get hardcoded into any of the binaries, especially as they may one
> day be deployed to $host where they will live in $prefix_for_host,
> without a $sysroot_of_compiler in sight.
> 
> Or am I misunderstanding something?

The latter is, I think, the most common approach. With automake-based projects
the final step is usually:

  make install DESTDIR=$sysroot

which really ends up being the same as you mentioned.

In my setup I also use one cross-compiler for different sysroots, so I pass
'--sysroot $sysroot' via CFLAGS/LDFLAGS into the configure script. AFAIK this
merely substitutes the default compiler sysroot. Looking at Paolo's patches
this should be supported. I hope to get around to testing the patches
sometime soon.

Thierry

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