[5/6] meson: correct the host machine definition in SDKs

The SDK_ARCH is not the correct definiton for the host machine definition
inside the SDK, but because a nativesdk recipe doesn't know what the
final target will be these values should be set up at SDK installation
time via the environment script.

Put placeholders in the installed meson.cross file instead, and replace
them at SDK installation time with the correct values.

Signed-off-by: Ross Burton <ross.burton@arm.com>
---
 .../meson/meson/meson-setup.py                | 37 +++++++++++++++++++
 meta/recipes-devtools/meson/meson_1.3.1.bb    | 16 ++------
 2 files changed, 41 insertions(+), 12 deletions(-)

I believe this causes the following failure:

https://autobuilder.yoctoproject.org/typhoon/#/builders/146/builds/1733/steps/12/logs/stdio

On 20/05/2024 10:18:32+0000, Ross Burton wrote:
> The SDK_ARCH is not the correct definiton for the host machine definition
> inside the SDK, but because a nativesdk recipe doesn't know what the
> final target will be these values should be set up at SDK installation
> time via the environment script.
> 
> Put placeholders in the installed meson.cross file instead, and replace
> them at SDK installation time with the correct values.
> 
> Signed-off-by: Ross Burton <ross.burton@arm.com>
> ---
>  .../meson/meson/meson-setup.py                | 37 +++++++++++++++++++
>  meta/recipes-devtools/meson/meson_1.3.1.bb    | 16 ++------
>  2 files changed, 41 insertions(+), 12 deletions(-)
> 
> diff --git a/meta/recipes-devtools/meson/meson/meson-setup.py b/meta/recipes-devtools/meson/meson/meson-setup.py
> index daaa551de2d..74579ecca6b 100755
> --- a/meta/recipes-devtools/meson/meson/meson-setup.py
> +++ b/meta/recipes-devtools/meson/meson/meson-setup.py
> @@ -1,9 +1,42 @@
>  #!/usr/bin/env python3
>  
>  import os
> +import re
>  import string
>  import sys
>  
> +# Keep these in sync with the logic in meson-routines.bbclass
> +def meson_cpu_family():
> +    arch = os.environ["OECORE_TARGET_ARCH"]
> +    if arch == 'powerpc':
> +        return 'ppc'
> +    elif arch == 'powerpc64' or arch == 'powerpc64le':
> +        return 'ppc64'
> +    elif arch == 'armeb':
> +        return 'arm'
> +    elif arch == 'aarch64_be':
> +        return 'aarch64'
> +    elif arch == 'mipsel':
> +        return 'mips'
> +    elif arch == 'mips64el':
> +        return 'mips64'
> +    elif re.match(r"i[3-6]86", arch):
> +        return "x86"
> +    elif arch == "microblazeel":
> +        return "microblaze"
> +    else:
> +        return arch
> +
> +def meson_operating_system():
> +    opersys = os.environ["OECORE_TARGET_ARCH"]
> +    if "mingw" in opersys:
> +        return "windows"
> +    # avoid e.g 'linux-gnueabi'
> +    elif "linux" in opersys:
> +        return "linux"
> +    else:
> +        return opersys
> +
>  class Template(string.Template):
>      delimiter = "@"
>  
> @@ -30,6 +63,10 @@ cross_file = os.path.join(sysroot, 'usr/share/meson/%smeson.cross' % os.environ[
>  native_template_file = os.path.join(sysroot, 'usr/share/meson/meson.native.template')
>  native_file = os.path.join(sysroot, 'usr/share/meson/meson.native')
>  
> +# Inject transformed values
> +os.environ["OECORE_MESON_TARGET_FAMILY"] = meson_cpu_family()
> +os.environ["OECORE_MESON_TARGET_OS"] = meson_operating_system()
> +
>  with open(template_file) as in_file:
>      template = in_file.read()
>      output = Template(template).substitute(Environ())
> diff --git a/meta/recipes-devtools/meson/meson_1.3.1.bb b/meta/recipes-devtools/meson/meson_1.3.1.bb
> index 5b0d82fe9f5..f8085f369bf 100644
> --- a/meta/recipes-devtools/meson/meson_1.3.1.bb
> +++ b/meta/recipes-devtools/meson/meson_1.3.1.bb
> @@ -117,18 +117,14 @@ needs_exe_wrapper = true
>  sys_root = @OECORE_TARGET_SYSROOT
>  
>  [host_machine]
> -system = '$host_system'
> -cpu_family = '$host_cpu_family'
> -cpu = '$host_cpu'
> -endian = '$host_endian'
> +system = @OECORE_MESON_TARGET_OS
> +cpu_family = @OECORE_MESON_TARGET_FAMILY
> +cpu = @OECORE_TARGET_ARCH
> +endian = @OECORE_TARGET_ENDIAN
>  EOF
>  }
>  
>  do_install:append:class-nativesdk() {
> -    host_system=${SDK_OS}
> -    host_cpu_family=${@meson_cpu_family("SDK_ARCH", d)}
> -    host_cpu=${SDK_ARCH}
> -    host_endian=${@meson_endian("SDK", d)}
>      install_templates
>  
>      install -d ${D}${SDKPATHNATIVE}/post-relocate-setup.d
> @@ -142,10 +138,6 @@ do_install:append:class-nativesdk() {
>  FILES:${PN}:append:class-nativesdk = "${datadir}/meson ${SDKPATHNATIVE}"
>  
>  do_install:append:class-native() {
> -    host_system=${HOST_OS}
> -    host_cpu_family=${@meson_cpu_family("HOST_ARCH", d)}
> -    host_cpu=${HOST_ARCH}
> -    host_endian=${@meson_endian("HOST", d)}
>      install_templates
>  
>      install -d ${D}${datadir}/post-relocate-setup.d
> -- 
> 2.34.1
> 

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