Hi,

The reason we need this is that we would like to use a Yocto-built BSP to boot our Android stack
(which includes GPU support), and for that to work we need to build it with this specific compiler.

Thanks,
Anders
________________________________
From: Sumit Garg <sumit.garg@linaro.org>
Sent: Tuesday, January 18, 2022 6:35 AM
To: Anders Dellien <Anders.Dellien@arm.com>
Cc: meta-arm@lists.yoctoproject.org <meta-arm@lists.yoctoproject.org>; Usama Arif <Usama.Arif@arm.com>
Subject: Re: [meta-arm] [PATCH 1/3] arm-toolchain: Fetch prebuilt Android Clang, version r416183b

On Mon, 17 Jan 2022 at 20:32, Anders Dellien <anders.dellien@arm.com> wrote:
>
> From: Usama Arif <usama.arif@arm.com>
>
> This Clang version is present in Android master
> (as of October 8, 2021)
>

Is there any specific motivation to use a pre-built Android clang
compiler rather than one built from source using meta-clang?

-Sumit

> Signed-off-by: Usama Arif <usama.arif@arm.com>
> Signed-off-by: Anders Dellien <anders.dellien@arm.com>
> Change-Id: I957742ee943ef68119fd7c7e2bd8ee62b717b31c
> ---
>  .../androidclang_r416183b.bb                  | 50 +++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 meta-arm-toolchain/recipes-devtools/external-arm-toolchain/androidclang_r416183b.bb
>
> diff --git a/meta-arm-toolchain/recipes-devtools/external-arm-toolchain/androidclang_r416183b.bb b/meta-arm-toolchain/recipes-devtools/external-arm-toolchain/androidclang_r416183b.bb
> new file mode 100644
> index 00000000..316cbb93
> --- /dev/null
> +++ b/meta-arm-toolchain/recipes-devtools/external-arm-toolchain/androidclang_r416183b.bb
> @@ -0,0 +1,50 @@
> +# SPDX-License-Identifier: MIT
> +#
> +# Copyright (c) 2021 Arm Limited
> +#
> +
> +SUMMARY = "Android Clang compiler"
> +DESCRIPTION = "Android Clang compiler, version r416183b. This is based on Clang 12.0.5 \
> +Intended usage is to build kernel images that match the output of the Android (hermetic) \
> +build system"
> +
> +LICENSE = "MIT"
> +
> +LIC_FILES_CHKSUM = "file://MODULE_LICENSE_MIT;md5=d41d8cd98f00b204e9800998ecf8427e"
> +
> +ANDROID_CLANG_VERSION = "clang-r416183b"
> +ANDROID_CLANG_HASH = "bd96dfe349c962681f0e5388af874c771ef96670"
> +
> +COMPATIBLE_HOST = "x86_64.*-linux"
> +
> +SRC_URI = "https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/+archive/${ANDROID_CLANG_HASH}/${ANDROID_CLANG_VERSION}.tar.gz;subdir=${ANDROID_CLANG_VERSION}"
> +
> +# We need to set the checksum to "ignore" because the tarball is dynamically generated and has a new checksum every time
> +# (the contents are the same, but the time stamp differs)
> +BB_STRICT_CHECKSUM = "ignore"
> +
> +S = "${WORKDIR}/${ANDROID_CLANG_VERSION}"
> +
> +do_install() {
> +    # We should really use ${libexecdir} here, but that as some files have invalid RPATH
> +    # this results in lots of warning. So using ${datadir} for now
> +    install -d ${D}${datadir}/${ANDROID_CLANG_VERSION}/
> +
> +    cp --no-preserve=ownership -r ${S}/. ${D}${datadir}/${ANDROID_CLANG_VERSION}/
> +
> +    install -d ${D}${bindir}
> +    # Symlink all executables into bindir
> +    for f in ${D}${datadir}/${ANDROID_CLANG_VERSION}/bin/*; do
> +        ln -rs $f ${D}${bindir}/$(basename $f)
> +    done
> +}
> +
> +INHIBIT_DEFAULT_DEPS = "1"
> +
> +INSANE_SKIP:${PN} = "already-stripped libdir staticdev file-rdeps arch dev-so"
> +
> +INHIBIT_SYSROOT_STRIP = "1"
> +INHIBIT_PACKAGE_STRIP = "1"
> +INHIBIT_PACKAGE_DEBUG_SPLIT = "1"
> +
> +BBCLASSEXTEND = "native nativesdk"
> --
> 2.17.1
>
>
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