Re: wanting to clarify building with linuxthreads versus NPTL

[Khem Raj <kraj at mvista dot com>]

Robert

It is pretty complete. however if you want linuxthreads and NPTL to be 
using same ld.so you might want to build glibc with linuxthreads and 
--with-tls
So that it understands the TLS.

Thanks

Khem

Robert P. J. Day said the following on 12/13/2005 09:32 AM:
>   as the last addition to my mini script, i want to add the ability to
> select either linuxthreads, NPTL or (what the heck) no threading at
> all, so i want to summarize the differences in building between all of
> the above.  (i'll restrict myself to recent GNU software.)
>
>   first, given that NPTL is now part of glibc proper, i only need to
> add the glibc-linuxthreads tarball if someone selects that threading
> model.  so far, so good.
>
>   the first couple steps of the toolchain creation:
>
>   * install kernel headers
>   * build and install binutils
>
> are identical as they have nothing to do with threads.  from there on
> is what matters and i'm going based on what i think i needed to do to
> build with NPTL.  one step at a time:
>
> install glibc headers:
> ----------------------
>
>   for linuxthreads, crosstool didn't appear to need to do anything in
> that step.
>
>   for NPTL, it seems i was forced to add to the configure options:
>
> 	--with-__thread
> 	--enable-add-ons=nptl
>
> i'm pretty sure this was necessary as a later step would fail without
> it.  does this make sense?
>
> build bootstrap gcc:
> -------------------
>
>   for linuxthreads, it seemed that there was no need to add thread
> support to the bootstrap compiler:
>
> 	--enable-threads=no
>
>   for NPTL, however, it seemed that i needed the additional configure
> options:
>
> 	--with-tls		 (not sure about this option)
> 	--enable-threads=posix   ("posix" is probably default)
>
> again, does this make sense?  does the bootstrap compiler really need
> thread support in the case of NPTL?
>
> building and installing glibc:
> -----------------------------
>
>   for linuxthreads, this step in crosstool had the following
> thread-related configure options:
>
> 	--without-tls
> 	--without-__thread
> 	enable-add-ons=linuxthreads
>
>   for NPTL, though, i'm pretty sure i needed all of the following:
>
> 	--with-tls
> 	--with-__thread
> 	enable-add-ons=nptl
>
> final gcc:
> ---------
>
>   it seems both linuxthreads and NPTL just need to set
> --enable-threads (with "posix" being the likely default, anyway).
>
>
>
> any comments on the above?  i just want the build to be as simple and
> straightforward as possible.
>
> rday
>
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