Re: [mini headsup] updating from 7.x to -CURRENT after lzma import

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On 2010/05/16 12:53, Kai Wang wrote:
> On Sun, May 16, 2010 at 11:36:29AM -0700, Tim Kientzle wrote:
>> Xin LI wrote:
>>> The recent lzma import has enabled libarchive's lzma support.  However,
>>> it have come to our attention that building -HEAD on earlier FreeBSD
>>> versions (specifically, 7.x after 700044 through 8.x before 800022) have
>>> been broken.
>>>
>>> The reason behind this is that 'make buildworld' will build a new ar(1)
>>> binary which links to libarchive, causing build to break on these systems.
>>
>> The following patch partially fixes this problem by just
>> disabling all compression support in ar.  (There's definitely
>> no gain in compressing static libraries unless ld can
>> read them. ;-)
> 
> I agree compressed ar(1) archive is not so useful without a ld(1) can
> read it. Also, the current ar(1) compression scheme is not well
> designed... Inside the elftoolchain project we are planning to rework
> the ar(1) compression part to make it only compress the member data
> while leave the member header intact. If the archive is compressed
> this way, ld(1) can still random access the archive members.  In order
> to implement this compression scheme, we will probably need to use a
> separate compressor since libarchive always compress the whole
> archive/stream (if I undertand correctly). So if we are going down
> this road, removing ar(1) libarchive compression bits right now would
> not be a bad idea, in my opinion.
> 
>> I don't think this totally fixes the problem.  I'd
>> appreciate if someone could try this and let me
>> know how far you get.
> 
> We also need to remove the compression stuff in the write part.
> I made a modified patch based on yours, it's available here:
> 
>   http://people.freebsd.org/~kaiw/ar.patch

Yes I think this would fix the issue.

(Maybe we should mention that these options would be ignored, in manual
page?)

Cheers,
- -- 
Xin LI <delphij_at_delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!	       Live free or die
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