Re: hppa nptl switch

[Aurelien Jarno <aurelien@aurel32.net>]

Carlos O'Donell a =E9crit :
> On Wed, Sep 2, 2009 at 10:55 AM, Aurelien Jarno<aurelien@aurel32.net>=
 wrote:
>> On Wed, Sep 02, 2009 at 10:09:22AM -0400, Carlos O'Donell wrote:
>>> On Tue, Sep 1, 2009 at 8:03 PM, Mike Frysinger<vapier@gentoo.org> w=
rote:
>>>> i think the question was one about packaging rather than general u=
se ?  if you
>>>> build a package against a newer glibc version but it only uses old=
er symbols,
>>>> then in theory it should work fine with older glibc versions.  if =
the symbol
>>>> changes between versions, then it should have corresponding symbol=
 version
>>>> changes as well (which will automatically be recorded in the binar=
y).
>>> Yes, the question is specifically about packaging.
>>>
>>> If the answer is "Debian does not prevent you from downgrading glib=
c,
>>> even if you have new packages built against the new glibc", then I
>>> accept that.
>>>
>> With the correct shlibs and symbol files, all packages built against=
 the
>> new glibc will depends on libc6 (>=3D 2.10). This way it won't be po=
ssible
>> to downgrade the libc6 packages is packages compiled against the new
>> glibc are installed.
>=20
> Is the shlibs sufficient? For example, data structures aren't
> versioned. In my new NPTL patches, I change PTHREAD_COND_INITIALIZER,
> but I do not version anything (not required because the current
> functions support both old and new style initializers), therefore the
> symbol files will be identical?
>=20

Yes, but we can change the symbol files so that all versions of all
symbols (for current symbols) resolve to libc6 (>=3D 2.10). This has
already been done for example for the sparc v8 to sparc v8plus ABI chan=
ge.

--=20
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net
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