[Buildroot] [PATCH] toolchain/toolchain-external: warn for untested GCC/kernel version

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

Arnout, All,

On 2020-01-13 23:59 +0100, Arnout Vandecappelle (Essensium/Mind) spake thusly:
> The oldest toolchain we test in the autobuilders is the Sourcery ARM
> toolchain which is GCC 4.8 and kernel headers 3.13. Therefore, it is
> likely that we're missing the required _AT_LEAST dependencies to exclude
> packages that don't build with older GCC/headers.
> 
> Add a comment to the custom external toolchain that warns when an
> untested GCC or kernel headers version is selected.
> 
> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

Applied to master, thanks.

Regards,
Yann E. MORIN.

> ---
> This patch was triggered by [1], where I observed that zxing-cpp is
> probably missing a GCC_AT_LEAST_4_8 dependency, but we don't detect this
> in the autobuilders for lack of an older toolchain.
> 
> Note that this also means we should probably remove all older
> GCC_AT_LEAST options from packages.
> 
> Alternatively, we could in the custom external toolchain remove all the
> old options (and also remove them from packages), and replace it with
> e.g. "4.8 or earlier".
> 
> But for the time being, this patch is simpler :-)
> 
> [1] http://lists.busybox.net/pipermail/buildroot/2020-January/271558.html
> ---
>  .../toolchain-external-custom/Config.in.options             | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/toolchain/toolchain-external/toolchain-external-custom/Config.in.options b/toolchain/toolchain-external/toolchain-external-custom/Config.in.options
> index 665765a104..9680509a13 100644
> --- a/toolchain/toolchain-external/toolchain-external-custom/Config.in.options
> +++ b/toolchain/toolchain-external/toolchain-external-custom/Config.in.options
> @@ -92,6 +92,9 @@ config BR2_TOOLCHAIN_EXTERNAL_GCC_OLD
>  
>  endchoice
>  
> +comment "GCC older than 4.8 is not tested by Buildroot. Use at your own risk."
> +	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
> +
>  choice
>  	bool "External toolchain kernel headers series"
>  	default BR2_TOOLCHAIN_EXTERNAL_HEADERS_REALLY_OLD
> @@ -298,6 +301,9 @@ config BR2_TOOLCHAIN_EXTERNAL_HEADERS_REALLY_OLD
>  
>  endchoice
>  
> +comment "Kernel headers older than 3.13 is not tested by Buildroot. Use at your own risk."
> +	depends on !BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_13
> +
>  choice
>  	prompt "External toolchain C library"
>  	default BR2_TOOLCHAIN_EXTERNAL_CUSTOM_UCLIBC
> -- 
> 2.21.1
> 
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