Re: [OE-core] [PATCH 1/9] nativesdk: ensure features don't get backfilled

[Alexandre Belloni <alexandre.belloni@bootlin.com>]

Hello Ross,

Not obvious but this is the cause of:

https://autobuilder.yoctoproject.org/typhoon/#/builders/20/builds/8697

On 12/12/2023 14:08:12+0000, Ross Burton wrote:
> From: Ross Burton <ross.burton@arm.com>
> 
> nativesdk aims to run in a slightly different environment than the
> target build, so it unsets MACHINE_FEATURES and lets DISTRO_FEATURES be
> filtered by DISTRO_FEATURES_NATIVESDK (in bitbake.conf).
> 
> However, feature backfill happens _after_ these operations:
> 
>  $ bitbake-getvar -r nativesdk-glib-2.0 MACHINE_FEATURES
>  #
>  # $MACHINE_FEATURES [5 operations]
>  #   set /home/ross/Yocto/poky/meta/conf/machine/include/qemu.inc:14
>  #     "alsa bluetooth usbgadget screen vfat"
>  #   set /home/ross/Yocto/poky/meta/conf/documentation.conf:284
>  #     [doc] "Specifies the list of hardware features the MACHINE supports."
>  #   set? /home/ross/Yocto/poky/meta/conf/bitbake.conf:893
>  #     ""
>  #   set /home/ross/Yocto/poky/meta/classes-recipe/nativesdk.bbclass:18
>  #     ""
>  #   append utils.py:132 [features_backfill]
>  #     " rtc qemu-usermode"
>  # pre-expansion value:
>  #   " rtc qemu-usermode"
>  MACHINE_FEATURES=" rtc qemu-usermode"
> 
> I don't believe this is intentional or desired as the machine features
> are unrelated to the nativesdk environment.  Specifically, this means
> that recipes that look for the qemu-usermode machine feature will fail
> in nativesdk as there may not actually be qemu-user support for the
> nativesdk environment.
> 
> Signed-off-by: Ross Burton <ross.burton@arm.com>
> ---
>  meta/classes-recipe/nativesdk.bbclass | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/meta/classes-recipe/nativesdk.bbclass b/meta/classes-recipe/nativesdk.bbclass
> index 08288fdb733..ccaf411f0d7 100644
> --- a/meta/classes-recipe/nativesdk.bbclass
> +++ b/meta/classes-recipe/nativesdk.bbclass
> @@ -15,7 +15,10 @@ NATIVESDKLIBC ?= "libc-glibc"
>  LIBCOVERRIDE = ":${NATIVESDKLIBC}"
>  CLASSOVERRIDE = "class-nativesdk"
>  MACHINEOVERRIDES = ""
> +
>  MACHINE_FEATURES = ""
> +DISTRO_FEATURES_BACKFILL = ""
> +MACHINE_FEATURES_BACKFILL = ""
>  
>  MULTILIBS = ""
>  
> -- 
> 2.34.1
> 

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-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com