[Buildroot] [PATCH 1/3] uclibc: adapt thread implementation selection to uClibc-ng
Yann E. MORIN
yann.morin.1998 at free.fr
Sun Mar 8 08:45:16 UTC 2015
Thomas, All,
On 2015-03-08 08:40 +0100, Thomas Petazzoni spake thusly:
> On Sat, 7 Mar 2015 18:39:28 +0100, Yann E. MORIN wrote:
> > > config BR2_UCLIBC_NG_VERSION_1_0_0
> > > bool "uClibc-ng 1.0.0"
> > > + select BR2_UCLIBC_VERSION_SUPPORTS_LINUXTHREADS \
> > > + if BR2_arc || BR2_m68k
> > > + select BR2_UCLIBC_VERSION_SUPPORTS_LINUXTHREADS_OLD \
> > > + if BR2_arc || BR2_bfin || BR2_m68k
> > > + select BR2_UCLIBC_VERSION_SUPPORTS_NPTL \
> > > + if !BR2_arc && !BR2_bfin && !BR2_x86_i386
> >
> > From what I can see, uclibc-ng on branch 1.0 :
> >
> > LT.old LT NPTL Notes
> > arc - - Y
>
> Ah, right, I missed that. So it means that right now we can't build an
> ARC toolchain with uClibc-ng in Buildroot: the ARC compiler version we
> use does not have TLS support, which is required for NPTL. So ARC +
> uClibc-ng is not possible right now.
>
> > arm Y - Y
>
> Yes, but Waldemar's wish is basically to not use LT or LT.old when
> there is NPTL support available. Which I believe makes sense. See his
> patch at http://patchwork.ozlabs.org/patch/446288/ where he was making
> LT and LT.old not available on ARM and ARMeb.
Eh, I never said we _had_ to have LT/LT.old when NPTL is available. ;-)
> > bfin Y Y -
>
> Correct. That needs to be fixed in my patch.
>
> > i386 - - -
> > i?86 - - Y except i386
> > m68k Y Y -
> > microblaze Y Y - not used in BR
> > mips - - Y
> > nios2 Y Y - not used in BR
> > powerpc - - Y
> > sh - - Y
> > sparc - - Y
> > x86_64 - - Y
> > xtensa - - Y
> >
> >
> > So, I guess your selection is incorrect, and you should have:
> >
> > select BR2_UCLIBC_VERSION_SUPPORTS_LINUXTHREADS \
> > if BR2_bfin || BR2_m68k
> > select BR2_UCLIBC_VERSION_SUPPORTS_LINUXTHREADS_OLD \
> > if BR2_bfin || BR2_m68k || BR2_arm || BR2_armeb
> > select BR2_UCLIBC_VERSION_SUPPORTS_NPTL \
> > if !BR2_bfin && !BR2_m68k && !BR2_x86_i386
>
> Ok, except the ARM case where I disagree (see above), and handling the
> ARC situation, I'm OK with your proposal.
OK. One more thing: since uClibc-ng supports microblaze and nios2, we
could enable uClibc (as in "uClibc in Buildroot") to build Buildroot
toolchains for those two archs, no?
Regards,
Yann E. MORIN.
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