Re: [Xen-devel] tool stack tool chain dependencies (again)

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Jan 05, 2017 at 04:57:12AM -0700, Jan Beulich wrote:
> >>> On 05.01.17 at 12:47, <wei.liu2@xxxxxxxxxx> wrote:
> > On Fri, Dec 16, 2016 at 05:52:29AM -0700, Jan Beulich wrote:
> >> Hello,
> >> 
> >> especially some of the changes late in the 4.8 cycle have caused me
> >> to spend a good part of the morning trying to figure out how to build
> >> the tool stack on an older system. Among other things I've run into
> >> - ipxe all of the sudden not working with make 3.80 anymore (despite
> >>   apparent attempts to do so in their Makefile)
> >> - ipxe not working with gas prior to 2.18 anymore (requiring the
> >>   .reloc directive)
> >> - rombios causing ld to segfault when building with debug=y (later
> >>   findings suggest this may be because overriding CC in ./.config
> >>   works, but doing so for e.g. AS and LD doesn't affect namely
> >>   the tools/firmware/ subtrees)
> >> - -O0 causing fallout with an admittedly questionable sys/stat.h
> >> None of this was a problem with an early October build.
> >> 
> >> I think we really need two things here: One is that I think we should
> >> bump our minimal required tool chain component versions, or
> > 
> > +1.
> > 
> >> alternatively have tools/configure properly disable sub-components
> >> (taking into account overrides from ./.config) - I certainly could live
> > 
> > If I'm not mistaken this requires we track tool chain requirements for
> > all dependencies and their dependencies.  This is going to be
> > unmanageable. 
> 
> Well, that (I think) depends on whether those other projects
> document their requirements. If things are properly spelled out,
> it shouldn't be that hard. And if they aren't properly spelled out,
> perhaps it would be worth a try asking them to do so.
> 

Yes, we can try that. Which external components that you find break
easily? We can start with those.

> >> with qemu-trad being disabled on such old systems, but otoh
> >> upstream qemu in the past has proven to not be much better, and
> >> it would be of questionable use if both got disabled. The other is
> >> that I think we should actually make sure things build with those
> >> versions.
> > 
> > Doug's work should help.
> 
> Which parts are you thinking of? I'm not aware of anything that
> has been done to test with specific tool chain component versions.
> 

The Docker based CI part -- see his reply to your email. It would be
easy to add different configurations there.

That would help we catch regressions early and fix things properly.

Wei.

> Jan
> 

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