[U-Boot] simple buildman usage

[Tom Rini]

On Wed, Jul 15, 2015 at 09:54:41AM -0600, Simon Glass wrote:
> Hi Stephen,
> 
> On 15 July 2015 at 09:50, Stephen Warren <swarren at wwwdotorg.org> wrote:
> > On 07/14/2015 05:33 PM, Tom Rini wrote:
> >>
> >> On Tue, Jul 14, 2015 at 04:39:01PM -0600, Stephen Warren wrote:
> >>>
> >>> On 07/14/2015 04:09 PM, Tom Rini wrote:
> >>>>
> >>>> On Tue, Jul 14, 2015 at 02:11:25PM -0600, Stephen Warren wrote:
> >>>>>
> >>>>> On 07/14/2015 11:56 AM, Tom Rini wrote:
> >>>>>>
> >>>>>> Hey all,
> >>>>>>
> >>>>>> I've pushed v2015.07 out to the repository and tarballs should exist
> >>>>>> soon.
> >>>>>>
> >>>>>> This sounds a bit like a broken record, but it's true.  The Kconfig
> >>>>>> migration and DM work continue moving along.
> >>>>>>
> >>>>>> Looking over the announcement for v2015.04, I see I said we'd
> >>>>>> deprecate
> >>>>>> MAKEALL.  So I've applied http://patchwork.ozlabs.org/patch/383960/
> >>>>>> right after the tag.  If buildman isn't working for you and your use
> >>>>>> case, we really need to talk.
> >>>>>
> >>>>>
> >>>>> The nice thing about MAKEALL was that I could simply grab a source
> >>>>> tree, and run the following to build in-tree:
> >>>>>
> >>>>> CROSS_COMPILE=something ./MAKEALL foo
> >>>>>
> >>>>> However, with buildman, some complex config file needed to be set up
> >>>>> to configure the toolchain (and I could never parse the docs to work
> >>>>> out how to create it in a new checkout), plus it made copies of the
> >>>>> source tree which takes ages for me.
> >>>>>
> >>>>> Is there an equivalently simple way to invoke buildman that doesn't
> >>>>> require configuration and copying?
> >>>>
> >>>>
> >>>> For no copying, --in-tree does what you want I think.
> >>>
> >>>
> >>> OK. Making that the default would be useful, or providing a buildman
> >>> wrapper script in the root directory that always passes this option.
> >>>
> >>>> For not
> >>>> configuring a toolchain, there's two ways to go about this.  One would
> >>>> be to do something like:
> >>>>
> >>>> diff --git a/tools/buildman/toolchain.py b/tools/buildman/toolchain.py
> >>>> index e33e105..bba60d5 100644
> >>>> --- a/tools/buildman/toolchain.py
> >>>> +++ b/tools/buildman/toolchain.py
> >>>> @@ -159,7 +159,7 @@ class Toolchains:
> >>>>                    " to your buildman config file %s. See README for
> >>>> details" %
> >>>>                    bsettings.config_fname)
> >>>>
> >>>> -        paths = []
> >>>> +        paths = ['/usr', '/usr/local']
> >>>>           for name, value in toolchains:
> >>>>               if '*' in value:
> >>>>                   paths += glob.glob(value)
> >>>>
> >>>> And then any toolchains in /usr and /usr/local would be picked up and
> >>>> used.  Another option would be to add --tool-chain-path DIR and throw
> >>>> that into the above function.  Thoughts?
> >>>
> >>>
> >>> Does that find cross-compilers? IIRC I had to add the full compiler
> >>> binary name into the config file, not just a /usr search directory,
> >>> so I don't think the above patch is enough to make it work. What if
> >>> I want to use a specific cross-compiler and I have 4 different ARM
> >>> compilers installed in /usr? How would it know which architecture's
> >>> cross-compiler to use?
> >>
> >>
> >> Well, how much are you expecting to Just Work without making a real
> >> config?
> >
> >
> > The same way MAKEALL did; by honoring CROSS_COMPILE:-)
> 
> Do you give it a different CROSS_COMPILE for every arch? Isn't that a pain?

And that's the problem / hard part about having buildman do something
with CROSS_COMPILE.  CROSS_COMPILE is inherently single-arch.  And while
that's fine for some use cases that's a huge problem for other use
cases.  What I have in mind is we add an option called say:
--add-tool-chain=PREFIX.  Will force PREFIX to be the toolchain used
for whatever architecture the heuristics apply it to.  This will
override anything found by the automagic checking.

This means that everyone that has automagic scripts for kernel building
can wrap in --add-tool-chain=${CROSS_COMPILE} and be done with it.  This
is slightlyd different than when I was thinking last night, but I think
more useful / less likely to surprise people.

-- 
Tom
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