[devel] forced noarch

[Alexey Tourbin]

On Wed, Dec 23, 2009 at 04:17:09PM +0200, Kirill A. Shutemov wrote:
> 2009/12/22 Alexey Tourbin <at на altlinux.ru>:
> > On Tue, Dec 22, 2009 at 09:18:49PM +0300, Dmitry V. Levin wrote:
> >> On Tue, Dec 22, 2009 at 11:05:56AM +0300, Alexey Tourbin wrote:
> >> [...]
> >> > http://git.altlinux.org/people/at/packages/girar-builder.git
> >> > 642af655  gb-task-check-noarch-i: force noarch by extensional equality
> >> [...]
> >> > 3) Cannot make arch package with identical files and deps.
> >> > E.g. cannot make arch perl module which should be noarch.
> >> >
> >> > [at на people 17774]$ PATH=~/git.alt/girar-builder:$PATH gb-task-check-noarch-i 5
> >> > error (#5): perl-Net-IP-1.25-alt2.i586.rpm should be noarch
> >>
> >> This restriction looks too hard.  How many packages in current
> >> repository would fail to pass the check?
> >
> > Why do you think it's too hard?  Basically, it says "if the list
> > of files is the same, and ***md5 sums*** are identical, and deps
> > are identical, the package must be noarch then".
> 
> I don't think that it's a good idea.
> 
> There are only two architectures in Sisyphus - i586 and x86_64,
> which are similar. It's not enough to be sure, that package is
> really noarch.

Can you specify a package (from the list) which is identical on i586
and x86_64, but should not be made noarch because it assumes e.g.
little-endian architecture?

> I think we should postpone the idea untill Sisyphus will have at
> least one non-x86 arch and one big-endian arch.

i586 and x86_64 are "different enough" except for endianness.
Look how they are different:
1) file paths are different (lib - lib64);
2) native binaries are different (elf32 - elf64);
3) sizeof(void*) == sizeof(long) is different.

How they are common:
1) sizeof(int) is the same (32 bit),
2) both are little endian.
Which means that certain host data structures (and thus certain binary
file formats) might have the same representation.
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