[Buildroot] [PATCH 1/4] arch/Config.in.xtensa: adjust endianness logic to avoid bogus configurations

[Yann E. MORIN]

Thomas, All,

On 2022-09-24 22:53 +0200, Thomas Petazzoni via buildroot spake thusly:
> The Xtensa architecture supports both LE and BE configurations. When
> BR2_XTENSA_CUSTOM is chosen, a choice in menuconfig to choose between
> LE and BE.
> 
> However, if using the internal toolchain backend, when the
> BR2_XTENSA_OVERLAY_FILE is empty, in practice, the configuration will
> always be big endian. But the choice being present, random
> configuration testing ends up testing configurations where
> BR2_XTENSA_OVERLAY_FILE is empty, but the endianness selected is LE,
> which is incorrect.
> 
> This commit fixes this by:
> 
>  (1) Showing the overlay file option only when building an internal
>      toolchain. For external toolchain configurations, it does not
>      make sense to show it as it will have no effect.

This should be a separate patch.

>  (2) Showing the endianness choice either for internal toolchain
>      configurations with non-empty BR2_XTENSA_OVERLAY_FILE, or for
>      external toolchain configurations.

As an empty BR2_XTENSA_OVERLAY_FILE is not accepted anymore (see below),
this can be simplified to "sharing the endianness chice for internal and
external toolchains".

>  (2) Defaulting to BE when BR2_XTENSA_OVERLAY_FILE is empty.

An empty BR2_XTENSA_OVERLAY_FILE is now no longer accepted, after commit
4cbf7336914f (arch/xtensa: custom configuration requires an overlay).

> Fixes:
>   http://autobuild.buildroot.net/results/702e2886156f291466375dfcf412c20f1aa5857d/

This commit if from August the 15th; I could not find any such failure
since 4cbf7336914f was applied; the last occured 2022-09-08, on commit
d2141f65e449, which is the parent of 4cbf7336914f (there are build
failures on older branches, of course, but not on master).

Regards,
Yann E. MORIN.

> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
> ---
>  arch/Config.in.xtensa | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/Config.in.xtensa b/arch/Config.in.xtensa
> index f9d5adb4c9..e9263f888e 100644
> --- a/arch/Config.in.xtensa
> +++ b/arch/Config.in.xtensa
> @@ -14,7 +14,7 @@ endchoice
>  
>  config BR2_XTENSA_OVERLAY_FILE
>  	string "Overlay file for custom configuration"
> -	depends on BR2_XTENSA_CUSTOM
> +	depends on BR2_XTENSA_CUSTOM && BR2_TOOLCHAIN_BUILDROOT
>  	help
>  	  Enter the path to the overlay tarball for a custom processor
>  	  configuration.
> @@ -31,6 +31,7 @@ choice
>  	prompt "Target Architecture Endianness"
>  	default BR2_XTENSA_LITTLE_ENDIAN
>  	depends on BR2_XTENSA_CUSTOM
> +	depends on BR2_XTENSA_OVERLAY_FILE != "" || BR2_TOOLCHAIN_EXTERNAL
>  
>  config BR2_XTENSA_LITTLE_ENDIAN
>  	bool "Little endian"
> @@ -51,7 +52,9 @@ config BR2_XTENSA_USE_MMU
>  
>  config BR2_ENDIAN
>  	default "LITTLE"	if BR2_XTENSA_LITTLE_ENDIAN
> -	default "BIG"		if BR2_xtensa_fsf || BR2_XTENSA_BIG_ENDIAN
> +	default "BIG"		if BR2_XTENSA_BIG_ENDIAN
> +	default "BIG"		if BR2_xtensa_fsf
> +	default "BIG"		if BR2_XTENSA_CUSTOM && BR2_XTENSA_OVERLAY_FILE = ""
>  
>  config BR2_ARCH
>  	default "xtensa"	if BR2_xtensa
> -- 
> 2.37.3
> 
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