Bootstrapping every checkout

[Pavel Pisa]

Hello Gedare,

On Sunday 04 March 2012 07:12:05 Gedare Bloom wrote:
> On Sun, Mar 4, 2012 at 12:19 AM, Ralf Corsepius
>
> <ralf.corsepius at rtems.org> wrote:
> > On 03/04/2012 06:00 AM, Gedare Bloom wrote:
> >> Hi
> >>
> >> I'm finding it cumbersome to re-run bootstrap each time I checkout a
> >> branch that has some changes that touch the build-related files in my
> >> experimental branches.
> >
> > Use multiple parallel checkouts.
>
> Yes I always did this when we used CVS; I was hoping there might be
> some nicer solution available.

You know probably next but I try anyway

 - for multiple local git checkout you can preserve (almost) all network
   bandwidth and space for history copies and still work with multiple
   separate checkouts when you use --reference option of GIT clone.

     git clone --reference /home/user/rtems/my-rtems-main-clone \
         git://git.rtems.org/rtems.git
      
   You can then push/pull changes to the rtems.org remote from
   the clone directly. You can
         
     cd /home/user/rtems/my-rtems-main-clone
     git pull /home/user/rtems/above-temporary-clone

   The GIT objects base works well even if you clone
   different person clone/development fork of
   the repo than "main" local clone is because most of the
   objects (file states or contents) are shared anyway.

 - In the theory, if you run configure with --enable-maintainer-mode
   then subsequent make invocations should rerun automake and autoconf
   in these subdirectories where Makefile, config.h, configure etc..
   prerequisites has newer date than auto-tools generated files.
   And GIT checkout newer changes dates of created files to their
   original commit in date.

   So it should work well after almost each possible RTEMS versions switch.
   I am not fully sure if it would work well when some directories
   with local config.ac are removed or added. But it depends probably
   on a way how elaborated is auto-tools integration into the project.

   But I am really retarded when it comes to auto-tools and their more
   advanced use so somebody with more knowledge (Joel, Ralf) could help
   and say if I am right in my expectations and check if RTEMS
   auto-tools build Makefile rules strong enough to catch all
   these situations or suggest when bootstrap has to be really run again.

Best wishes,

             Pavel