Re: [RFC] README: Update Linux version requirement to 2.3.31.

[wylda at volny.cz]

>> When I run winecfg, I got:
>>
>> wine: glibc >= 2.3 without NPTL or TLS is not a supported combination.
>>      Please upgrade to a glibc with NPTL support.
>>
>>
>> Should I interpret that message, that:
>> 1. NPTL is required
>> 2. I should use glibc-2.2 or lower
>>
>> If 1) that's probably end of game per https://lwn.net/Articles/10465/
>> * "- The 2.5.36 kernel or above must be installed and used."
>> * "The current snapshot for glibc 2.3 (or glibc 2.3 when released) is
>>    necessary."
>> * "The general compiler requirement for glibc is at least gcc 3.2."
>>
>> So for further steps 1) or 2) ?
>
>A glibc using TLS might still work without NPTL, though that may require
>glibc 2.3 anyway.

Yes, TLS was added to 2.5.29:
https://www.kernel.org/pub/linux/kernel/v2.5/ChangeLog-2.5.29

...and further improved in 2.5.32:
https://lwn.net/Articles/7591/

> Note that the above requirements are for building
>glibc, not running it.

Short version: hint for 2.3 is probably not correct

Longer version based on Glibc's release notes:

glibc-2.3: Even though TLS support is mentioned as one new feature for this release
the default is not to build glibc with TLS support enabled.  This has
several reasons, most of which are out of control of the glibc
developers.  Therefore it is necessry to *not* use the --with-tls option
for configure.

=no support for TLS & NPTL in glibc-2.3.

glibc-2.3.2: ELF thread-local storage support (TLS) now works on x86-64.
glibc-2.3.2: The sources were also prepared to be used with the NPTL
 thread library which is not yet included.

=no support for NPTL in glibc-2.3.2 itself

glibc-2.3.3: The main glibc-2.3.3 release
package contains the Native POSIX Threads Library (NPTL) contributed
by Ulrich Drepper, which supports Linux 2.6 kernels only.


 > The NPTL support was backported to older kernels IIRC.

It seems, that RedHat did that...
http://rpm.pbone.net/index.php3/stat/4/idpl/18727833/dir/fedora_1/com/kernel-2.4.22-1.2115.nptl.i686.rpm.html

I'm not fan of Fedora, so i could try your initially suggested
"A glibc using TLS might still work without NPTL...", i.e.
kernel-2.5.32 + rebuild of glibc-2.3.2, but i find that
glibc recipe pretty painful. But if you are expecting rather
2.4.xx results, that would be for some Fedora/RedHat fans.

Anyway, i don't see chances for anything like subject mentioned
linux v2.3.31.