[Buildroot] [PATCH 1/1] package/meson: fix blank entry in cross-compilation.conf

[Peter Seiderer]

Hello Derrick,

On Fri, 23 Oct 2020 06:12:51 +0000, Derrick Lyndon Pallas <derrick at meter.com> wrote:

> Without this change, cross-compilation.conf seems to be generated with a
> blank cpu entry in the host_machine section.  (Note: what meson calls host,
> buildroot calls target.)
>
> The effect is that meson-based packages may fail to detect architectural
> features of the target CPU, like SSE support, and either fail to take
> advantage of them or just refuse to compile.
>
> This change follows the convention used to emit the `endian` entry in that
> section, which comes from [92eca65ddf meson: Strip quotes from BR2_ENDIAN].
> To verify: `grep cpu ./output/host/etc/meson/cross-compilation.conf`

On my system (for a RPi4 configuration) already without your patch:

	$ grep cpu host/etc/meson/cross-compilation.conf
cpu_family ='aarch64'
cpu = 'cortex-a72'

>
> Signed-off-by: Derrick Lyndon Pallas <derrick at meter.com>
> ---
>  package/meson/meson.mk | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/package/meson/meson.mk b/package/meson/meson.mk
> index d39e66cf05..9bccea8fef 100644
> --- a/package/meson/meson.mk
> +++ b/package/meson/meson.mk
> @@ -14,7 +14,7 @@ HOST_MESON_DEPENDENCIES = host-ninja
>  HOST_MESON_NEEDS_HOST_PYTHON = python3
>
>  HOST_MESON_TARGET_ENDIAN = $(call qstrip,$(call LOWERCASE,$(BR2_ENDIAN)))
> -HOST_MESON_TARGET_CPU = $(GCC_TARGET_CPU)
> +HOST_MESON_TARGET_CPU = $(call qstrip,$(call LOWERCASE,$(GCC_TARGET_CPU)))

GCC_TARGET_CPU comes from arch/arch.mk:

GCC_TARGET_CPU := $(call qstrip,$(BR2_GCC_TARGET_CPU))

Anything special with your configuration/build environment (which
buildroot version)? What is the BR2_GCC_TARGET_CPU entry in
your .config file?

Regards,
Peter

>
>  # https://mesonbuild.com/Reference-tables.html#cpu-families
>  ifeq ($(BR2_arcle)$(BR2_arceb),y)