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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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.

>> 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.

Jan


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