[Buildroot] [PATCH] uclibc: proper thread default on m68k and Microblaze

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2016-08-05 18:35 +0200, Thomas Petazzoni spake thusly:
> Traditionally, Buildroot has a default of enabling thread
> support. However, with the current construct of the thread choice in the
> uclibc package, the m68k and microblaze architecture end up with no
> thread support as the default.
> 
> In order to avoid having to explicit a more complicated "default" value
> for the choice, we take a simple approach:
> 
>  - The "none" choice is moved at the end of the list, so that it is not
>    selected as the default unless there is really no other thread
>    implementation available.
> 
>  - We make NPTL the default thread implementation.
> 
>  - On architectures where NPTL is not available, the NPTL option will
>    not be available, so Kconfig will automatically fallback to
>    linuxthreads.

And to make things even more simple, why not move NPTL first, then LT,
then none, and remove the default?

Thus, when NPTL is avbailable, it is used; if not, LT is used; if not,
then none is used.

Regards,
Yann E. MORIN.

> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
> ---
>  package/uclibc/Config.in | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/package/uclibc/Config.in b/package/uclibc/Config.in
> index 7c99195..b7714d4 100644
> --- a/package/uclibc/Config.in
> +++ b/package/uclibc/Config.in
> @@ -47,15 +47,13 @@ config BR2_TOOLCHAIN_BUILDROOT_LOCALE
>  
>  choice
>  	prompt "Thread library implementation"
> +	# Use NPTL when available. If not available, kconfig will
> +	# automatically fall back to linuxthreads.
>  	default BR2_PTHREADS_NATIVE
> -	default BR2_PTHREADS if !BR2_USE_MMU
>  	help
>  	  Use this option to select the thread library implementation
>  	  that should be used in your toolchain.
>  
> -	config BR2_PTHREADS_NONE
> -		bool "none"
> -
>  	config BR2_PTHREADS
>  		bool "linuxthreads"
>  		select BR2_TOOLCHAIN_HAS_THREADS
> @@ -67,6 +65,10 @@ choice
>  		select BR2_TOOLCHAIN_HAS_THREADS_NPTL
>  		depends on BR2_USE_MMU
>  		depends on !BR2_m68k && !BR2_microblaze
> +
> +	config BR2_PTHREADS_NONE
> +		bool "none"
> +
>  endchoice
>  
>  config BR2_PTHREAD_DEBUG
> -- 
> 2.7.4
> 
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