Re: [OE-core] [PATCH] u-boot: add support for Clang toolchain

[Quentin Schulz <quentin.schulz@cherry.de>]

Hi Harish,

On 8/11/26 12:56 PM, Sadineni, Harish via lists.openembedded.org wrote:
> From: Harish Sadineni <Harish.Sadineni@windriver.com>
> 
> Fix build issues that occur when the Clang toolchain is selected.
> 
> Remove the hard-coded TOOLCHAIN = "gcc" behavior and make the target compiler
> selection conditional on TOOLCHAIN. This preserves GCC as the default compiler
> while allowing Clang to be selected when TOOLCHAIN = "clang".
> 
> YOCTO [#16385]
> 
> Signed-off-by: Harish Sadineni <Harish.Sadineni@windriver.com>
> ---
>   meta/recipes-bsp/u-boot/u-boot.inc | 6 +-----
>   1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/meta/recipes-bsp/u-boot/u-boot.inc b/meta/recipes-bsp/u-boot/u-boot.inc
> index 00a12f1bb9..2197039dbc 100644
> --- a/meta/recipes-bsp/u-boot/u-boot.inc
> +++ b/meta/recipes-bsp/u-boot/u-boot.inc
> @@ -3,10 +3,6 @@ PROVIDES = "virtual/bootloader"
>   
>   PACKAGE_ARCH = "${MACHINE_ARCH}"
>   
> -# u-boot is best built with gcc
> -# https://docs.u-boot-project.org/en/latest/build/clang.html
> -TOOLCHAIN = "gcc"
> -
>   DEPENDS += "${@bb.utils.contains('UBOOT_ENV_SUFFIX', 'scr', 'u-boot-mkimage-native', '', d)}"
>   DEPENDS += "${@ 'u-boot-mkenvimage-native' if bb.utils.to_boolean(d.getVar('UBOOT_INITIAL_ENV_BINARY')) else ''}"
>   
> @@ -15,7 +11,7 @@ inherit uboot-config uboot-extlinux-config uboot-sign deploy python3native
>   DEPENDS += "swig-native"
>   
>   EXTRA_OEMAKE = 'CROSS_COMPILE=${TARGET_PREFIX} V=1'
> -EXTRA_OEMAKE += 'CC="${TARGET_PREFIX}gcc ${TOOLCHAIN_OPTIONS} ${DEBUG_PREFIX_MAP}"'
> +EXTRA_OEMAKE += 'CC="${TARGET_PREFIX}${@bb.utils.contains('TOOLCHAIN', 'clang', 'clang', 'gcc', d)} ${TOOLCHAIN_OPTIONS} ${DEBUG_PREFIX_MAP}"'

Why not simply ${TOOLCHAIN}?

Have you checked we can build u-boot-tools, u-boot-tools-native and 
nativesdk-u-boot-tools with clang?

Cheers,
Quentin