Re: [Ltib] Issue when changing toolchains in a build

[Stuart Hughes]

On 03/10/12 17:45, Peter Barada wrote:
> On 10/03/2012 12:08 PM, Stuart Hughes wrote:
> > On 03/10/12 16:46, Peter Barada wrote:
> > > Stuart,
> > >
> > > If I have a build where the kernel source is needed to build another
> > > module, (or some other package source is needed for another package to
> > > build), then the package is built and the source/object files are in
> > > rpm/BUILD.  If I then do "./ltib -c" and change the toolchain, LTIB
> > > properly de-installs all the packages, and then builds the packages
> > > again using the new toolchain, including the source that was left behind
> > > from the previous build.
> > >
> > > So far so good, but if the new toolchain default (on ARM for example)
> > > causes incompatible object files (i.e. using hard vs soft float ABI on
> > > ARM), then the package source that was previously built will fail to
> > > build/link due to the incompatibility.
> > >
> > > I think the right way to fix this is to execute a "distclean" on package
> > > source that exist, triggered by ${LTIB_FULL_REBUILD} before rebuilding,
> > > but so far I haven't quite figured out the path to get this to happen.
> > > I'm more than happy to tackle it but need a pointer that makes the code
> > > flow clear.
> > >
> > > Thanks in advance!
> > Hi Peter,
> >
> > I agree with your analysis.  Again I need to go off and think about
> > this dark corner of LTIB.  Once I've refreshed my memory, I'll get
> > back to you.
> Thanks!
Hi Peter,

In the case of kernels, they should already do a full clean if a 
LTIB_FULL_REBUILD is set.  If you look in 
./dist/lfs-5.1/kernel/kernel-common.tmpl line 114, you'll see:

#
# Check for ltib full rebuilds (e.g. change of toolchain) if so
# force a build from scratch
#

if [ -n "$LTIB_FULL_REBUILD" ]
then
    make ARCH=$LINTARCH HOSTCC="$BUILDCC" mrproper
fi

Is this causing a problem/not working, or is it other packages that you 
need to distclean?

Regards, Stuart