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package/rustc: add support for Tier 1 and Tier 2 platforms
authorThomas Petazzoni <thomas.petazzoni@bootlin.com>
Tue, 18 May 2021 20:54:31 +0000 (22:54 +0200)
committerYann E. MORIN <yann.morin.1998@free.fr>
Tue, 18 May 2021 21:39:42 +0000 (23:39 +0200)
This commit reworks how BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS is
defined to more clearly map with the list of platforms supported by
Rust as listed at
https://doc.rust-lang.org/nightly/rustc/platform-support.html. Indeed,
the situation is not as simple as a list of architectures, all
supported for both glibc and musl.

So instead, we take the approach of directly mapping with what's
described at
https://doc.rust-lang.org/nightly/rustc/platform-support.html, which
means:

 * A list of Tier 1 platforms (in fact just 3 platforms)

 * A list of Tier 2 platforms with host tools (i.e where rustc and
   cargo themselves are available for the target, something that isn't
   relevant for Buildroot)

 * A list of Tier 2 platforms with no host tools support.

For each platform, we add as a comment its Rust tuple name, as listed
at https://doc.rust-lang.org/nightly/rustc/platform-support.html, and
then the corresponding Buildroot architecture/libc dependency.

This is obviously more verbose than it was, but it is also a lot
easier to maintain.

With this, a total of 16 new platforms are supported, 13 of which are
musl-based. The additional non-musl platforms are ARMv5TE, RISC-V
64-bit and Sparc64.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
package/rust-bin/rust-bin.hash patch | blob | history
package/rustc/Config.in.host patch | blob | history

diff --git a/package/rust-bin/rust-bin.hash b/package/rust-bin/rust-bin.hash
index 0800dcca97024f440e734541617482f33af9a7b7..f7fb983813b787571c7745452e822bdacae00314 100644 (file)
--- a/package/rust-bin/rust-bin.hash
+++ b/package/rust-bin/rust-bin.hash
@@ -7,33 +7,72 @@ sha256  d440cb932bbaaf43b600bd47b2dd4a05bc669a74d88addeeb943d694638d8e6e  rust-1
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-aarch64-unknown-linux-gnu.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-aarch64-unknown-linux-gnu.tar.xz.asc
 sha256  3720d98988302bc1f676cef2ea3b2a641404cbbe2d47d0f28f8954658586aa12  rust-std-1.52.0-aarch64-unknown-linux-gnu.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-aarch64-unknown-linux-musl.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-aarch64-unknown-linux-musl.tar.xz.asc
+sha256 153d4a56264b3c38187c566ebdc3dee2e7573cad87b7c68b7e5c52d0c5ad056a  rust-std-1.52.0-aarch64-unknown-linux-musl.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-arm-unknown-linux-gnueabi.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-arm-unknown-linux-gnueabi.tar.xz.asc
 sha256  593ec073c273028f60cf49d6084ee1809e075682f3e65f9cc86067f84f71d5f7  rust-std-1.52.0-arm-unknown-linux-gnueabi.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-arm-unknown-linux-gnueabihf.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-arm-unknown-linux-gnueabihf.tar.xz.asc
 sha256  c251bf48962ff8f96e3572cecee12b1b3286477e66cb9c42c1fbe0118d6bdaf5  rust-std-1.52.0-arm-unknown-linux-gnueabihf.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-arm-unknown-linux-musleabihf.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-arm-unknown-linux-musleabihf.tar.xz.asc
+sha256 236944c4ce5dfdc16471b2bc7dc45dfc04f97528a403851ef210fffa55d36434  rust-std-1.52.0-arm-unknown-linux-musleabihf.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-arm-unknown-linux-musleabi.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-arm-unknown-linux-musleabi.tar.xz.asc
+sha256 73d99f322c9a86219205aa6bb871a0f3e52c605c2d16a6821188ff90423073ec  rust-std-1.52.0-arm-unknown-linux-musleabi.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-armv5te-unknown-linux-gnueabi.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-armv5te-unknown-linux-gnueabi.tar.xz.asc
+sha256 fbe790020b1178aeb0be213ceabff9aa4542448685b3bc7a70f87edae200d1ae  rust-std-1.52.0-armv5te-unknown-linux-gnueabi.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-armv5te-unknown-linux-musleabi.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-armv5te-unknown-linux-musleabi.tar.xz.asc
+sha256 7c3f989962ab7d0cf841f1d5c597db3cb14d9f09427ab9ff35a26248cd3b3e01  rust-std-1.52.0-armv5te-unknown-linux-musleabi.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-armv7-unknown-linux-gnueabihf.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-armv7-unknown-linux-gnueabihf.tar.xz.asc
 sha256  c28c6870b9717c6c2e2015a6a5581ccb130f9d393db8166da4513680fe03d4ea  rust-std-1.52.0-armv7-unknown-linux-gnueabihf.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-armv7-unknown-linux-musleabihf.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-armv7-unknown-linux-musleabihf.tar.xz.asc
+sha256 d483aad358c480d1593ebf6d9605bf012125670823fa7d895f528a2b4e0f5092  rust-std-1.52.0-armv7-unknown-linux-musleabihf.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-armv7-unknown-linux-musleabi.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-armv7-unknown-linux-musleabi.tar.xz.asc
+sha256 0a51992109c837a93d77a57edbbd3d25badca68b354a9fe4a77c354baff1559a  rust-std-1.52.0-armv7-unknown-linux-musleabi.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-i586-unknown-linux-gnu.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-i586-unknown-linux-gnu.tar.xz.asc
 sha256  f4d094e1cd73372f1565473b072e22278afeb2b728a178e6e9f1c813a9b76c23  rust-std-1.52.0-i586-unknown-linux-gnu.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-i586-unknown-linux-musl.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-i586-unknown-linux-musl.tar.xz.asc
+sha256 f364545baba647ce8b5e50b362303885bf5df47a9a285360d8c10a5948a36617  rust-std-1.52.0-i586-unknown-linux-musl.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-i686-unknown-linux-gnu.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-i686-unknown-linux-gnu.tar.xz.asc
 sha256  54749b579a8426dd46afe67feb3c206b0b129e59873a443dcd93ed51232a37d6  rust-std-1.52.0-i686-unknown-linux-gnu.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-i686-unknown-linux-musl.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-i686-unknown-linux-musl.tar.xz.asc
+sha256 517a5a714b696313dc2713b41482ff17034bf1755df859a8c99943932e903079  rust-std-1.52.0-i686-unknown-linux-musl.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-mips-unknown-linux-gnu.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-mips-unknown-linux-gnu.tar.xz.asc
 sha256  51492598343e5490c620fd04a16c3f41e2fe9f52232dc67fc1bc937233a2e85d  rust-std-1.52.0-mips-unknown-linux-gnu.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-mips-unknown-linux-musl.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-mips-unknown-linux-musl.tar.xz.asc
+sha256 bec4d58999205aae3224d01e29b8cf74c7899e034444684620d6e7613916de0d  rust-std-1.52.0-mips-unknown-linux-musl.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-mips64-unknown-linux-gnuabi64.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-mips64-unknown-linux-gnuabi64.tar.xz.asc
 sha256  8db8fac92466389629055d590ca06b7ef1c82621f05cba709413f2ce2c3c5407  rust-std-1.52.0-mips64-unknown-linux-gnuabi64.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-mips64-unknown-linux-muslabi64.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-mips64-unknown-linux-muslabi64.tar.xz.asc
+sha256 43daa71ac3f7b86f98d8e5a4ee81bf0f4979ad33fc5a8e3f9f8604cacaa0ae14  rust-std-1.52.0-mips64-unknown-linux-muslabi64.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-mips64el-unknown-linux-gnuabi64.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-mips64el-unknown-linux-gnuabi64.tar.xz.asc
 sha256  824391b79c9b28be7a18feab1adb0eed1a9459667e93572fc8b343985ca965ba  rust-std-1.52.0-mips64el-unknown-linux-gnuabi64.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-mips64el-unknown-linux-muslabi64.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-mips64el-unknown-linux-muslabi64.tar.xz.asc
+sha256 84e9948c8d850dc1c76e146de0f577be7a4d2a8e9b42fee43b05d88237e37c82  rust-std-1.52.0-mips64el-unknown-linux-muslabi64.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-mipsel-unknown-linux-gnu.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-mipsel-unknown-linux-gnu.tar.xz.asc
 sha256  a6de773dfcdc8cac832ac6c356e2c0ecfd94fd7f7242aac82f8922f5bd1639e9  rust-std-1.52.0-mipsel-unknown-linux-gnu.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-mipsel-unknown-linux-musl.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-mipsel-unknown-linux-musl.tar.xz.asc
+sha256 724df483aaf0797e30844715c537be9257074355201e92c992d12b2376d1b0ce  rust-std-1.52.0-mipsel-unknown-linux-musl.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-powerpc-unknown-linux-gnu.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-powerpc-unknown-linux-gnu.tar.xz.asc
 sha256  2ad7e17bcb8f632eb4206294ab977bbe1b7562009a3ca84a8d753ff454b1ee07  rust-std-1.52.0-powerpc-unknown-linux-gnu.tar.xz
@@ -43,9 +82,18 @@ sha256  a792384afe034322b4b430049f57ed5e5fe9efbcf74c13c3edaf04062392727a  rust-s
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-powerpc64le-unknown-linux-gnu.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-powerpc64le-unknown-linux-gnu.tar.xz.asc
 sha256  af5256a5f1cb189415b0d6b3e349312bbe8a78331a817c8da79ccfe9a07c0aed  rust-std-1.52.0-powerpc64le-unknown-linux-gnu.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-riscv64gc-unknown-linux-gnu.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-riscv64gc-unknown-linux-gnu.tar.xz.asc
+sha256 573d8681cfc0ce71e735254ac33bfca7644fd4251699781b16dd18633a8e92ad  rust-std-1.52.0-riscv64gc-unknown-linux-gnu.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-sparc64-unknown-linux-gnu.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-sparc64-unknown-linux-gnu.tar.xz.asc
+sha256 0320e71a4c010295968b7ba05e68550b97c6b42520e72f1a534b0135c966cc99  rust-std-1.52.0-sparc64-unknown-linux-gnu.tar.xz
 # From https://static.rust-lang.org/dist/rust-std-1.52.0-x86_64-unknown-linux-gnu.tar.xz.sha256
 # Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-x86_64-unknown-linux-gnu.tar.xz.asc
 sha256  dcdc0083facd6484527494ee5b8f72e040a095ab346bb658ce176be573d5c9b4  rust-std-1.52.0-x86_64-unknown-linux-gnu.tar.xz
+# From https://static.rust-lang.org/dist/rust-std-1.52.0-x86_64-unknown-linux-musl.tar.xz.sha256
+# Verified using https://static.rust-lang.org/dist/rust-std-1.52.0-x86_64-unknown-linux-musl.tar.xz.asc
+sha256 d5809f3f1345a3c524f00cfa2ac1631b494a6de3143b1a3d081476f2c4f78905  rust-std-1.52.0-x86_64-unknown-linux-musl.tar.xz
 # Locally generated
 sha256  62c7a1e35f56406896d7aa7ca52d0cc0d272ac022b5d2796e7d6905db8a3636a  LICENSE-APACHE
 sha256  23f18e03dc49df91622fe2a76176497404e46ced8a715d9d2b67a7446571cca3  LICENSE-MIT
diff --git a/package/rustc/Config.in.host b/package/rustc/Config.in.host
index 1df25ae326d4a881657c38cb8817b79a8c2a83c6..c5f64fd3c646f584071f649ecf4359441d77f7ac 100644 (file)
--- a/package/rustc/Config.in.host
+++ b/package/rustc/Config.in.host
@@ -3,21 +3,101 @@ config BR2_PACKAGE_HOST_RUSTC_ARCH_SUPPORTS
        bool
        default y if BR2_HOSTARCH = "x86_64" || BR2_HOSTARCH = "x86"
 
+# The pre-built Rust standard library is only available for a number
+# of architectures/C libraries combinations, with different levels of
+# support: Tier 1 platforms, Tier 2 platforms with host tools, Tier 2
+# platforms, Tier 3 platforms. Below, we support Tier 1, Tier 2 with
+# host tools and Tier 2 platforms.
+
+# The below entries match Tier 1 platforms as described at
+# https://doc.rust-lang.org/nightly/rustc/platform-support.html.
+config BR2_PACKAGE_HOST_RUSTC_TARGET_TIER1_PLATFORMS
+       bool
+       # aarch64-unknown-linux-gnu
+       default y if BR2_aarch64 && BR2_TOOLCHAIN_USES_GLIBC
+       # i686-unknown-linux-gnu
+       default y if (BR2_i686 || BR2_x86_pentiumpro || BR2_X86_CPU_HAS_MMX) && BR2_TOOLCHAIN_USES_GLIBC
+       # x86_64-unknown-linux-gnu
+       default y if BR2_x86_64 && BR2_TOOLCHAIN_USES_GLIBC
+
+# The below entries match Tier 2 platforms with host tools as
+# described at
+# https://doc.rust-lang.org/nightly/rustc/platform-support.html.
+config BR2_PACKAGE_HOST_RUSTC_TARGET_TIER2_HOST_TOOLS_PLATFORMS
+       bool
+       # aarch64-unknown-linux-musl
+       default y if BR2_aarch64 && BR2_TOOLCHAIN_USES_MUSL
+       # arm-unknown-linux-gnueabi
+       default y if BR2_ARM_CPU_ARMV6 && BR2_ARM_EABI && BR2_TOOLCHAIN_USES_GLIBC
+       # arm-unknown-linux-gnueabihf
+       default y if BR2_ARM_CPU_ARMV6 && BR2_ARM_EABIHF && BR2_TOOLCHAIN_USES_GLIBC
+       # armv7-unknown-linux-gnueabihf
+       default y if BR2_ARM_CPU_ARMV7A && BR2_ARM_EABIHF && BR2_TOOLCHAIN_USES_GLIBC
+       # mips-unknown-linux-gnu
+       default y if BR2_mips && BR2_TOOLCHAIN_USES_GLIBC && !BR2_MIPS_CPU_MIPS32R6
+       # mips64-unknown-linux-gnuabi64
+       default y if BR2_mips64 && BR2_TOOLCHAIN_USES_GLIBC && BR2_MIPS_NABI64 && !BR2_MIPS_CPU_MIPS32R6
+       # mipsel-unknown-linux-gnu
+       default y if BR2_mipsel && BR2_TOOLCHAIN_USES_GLIBC && !BR2_MIPS_CPU_MIPS32R6
+       # mips64el-unknown-linux-gnuabi64
+       default y if BR2_mips64el && BR2_TOOLCHAIN_USES_GLIBC && BR2_MIPS_NABI64 && !BR2_MIPS_CPU_MIPS32R6
+       # powerpc-unknown-linux-gnu
+       default y if BR2_powerpc && BR2_TOOLCHAIN_USES_GLIBC
+       # powerpc64-unknown-linux-gnu
+       default y if BR2_powerpc64 && BR2_TOOLCHAIN_USES_GLIBC
+       # powerpc64le-unknown-linux-gnu
+       default y if BR2_powerpc64le && BR2_TOOLCHAIN_USES_GLIBC
+       # riscv64gc-unknown-linux-gnu
+       # "g" stands for imafd, and we also need "c".
+       default y if BR2_riscv && BR2_RISCV_ISA_RVI && BR2_RISCV_ISA_RVM && \
+                       BR2_RISCV_ISA_RVA && BR2_RISCV_ISA_RVF && \
+                       BR2_RISCV_ISA_RVD && BR2_RISCV_ISA_RVC && \
+                       BR2_TOOLCHAIN_USES_GLIBC
+       # x86_64-unknown-linux-musl
+       default y if BR2_x86_64 && BR2_TOOLCHAIN_USES_MUSL
+
+# The below entries match Tier 2 platforms without host tools as
+# described at
+# https://doc.rust-lang.org/nightly/rustc/platform-support.html.
+config BR2_PACKAGE_HOST_RUSTC_TARGET_TIER2_PLATFORMS
+       bool
+       # arm-unknown-linux-musleabi
+       default y if BR2_ARM_CPU_ARMV6 && BR2_ARM_EABI && BR2_TOOLCHAIN_USES_MUSL
+       # arm-unknown-linux-musleabihf
+       default y if BR2_ARM_CPU_ARMV6 && BR2_ARM_EABIHF && BR2_TOOLCHAIN_USES_MUSL
+       # armv5te-unknown-linux-gnueabi
+       default y if BR2_ARM_CPU_ARMV5 && BR2_ARM_EABI && BR2_TOOLCHAIN_USES_GLIBC
+       # armv5te-unknown-linux-musleabi
+       default y if BR2_ARM_CPU_ARMV5 && BR2_ARM_EABI && BR2_TOOLCHAIN_USES_MUSL
+       # armv7-unknown-linux-gnueabi
+       default y if BR2_ARM_CPU_ARMV7A && BR2_ARM_EABI && BR2_TOOLCHAIN_USES_GLIBC
+       # armv7-unknown-linux-musleabi
+       default y if BR2_ARM_CPU_ARMV7A && BR2_ARM_EABI && BR2_TOOLCHAIN_USES_MUSL
+       # armv7-unknown-linux-musleabihf
+       default y if BR2_ARM_CPU_ARMV7A && BR2_ARM_EABIHF && BR2_TOOLCHAIN_USES_MUSL
+       # i586-unknown-linux-gnu
+       default y if BR2_i586 && BR2_TOOLCHAIN_USES_GLIBC
+       # i586-unknown-linux-musl
+       default y if BR2_i586 && BR2_TOOLCHAIN_USES_MUSL
+       # i686-unknown-linux-musl
+       default y if (BR2_i686 || BR2_x86_pentiumpro || BR2_X86_CPU_HAS_MMX) && BR2_TOOLCHAIN_USES_MUSL
+       # mips-unknown-linux-musl
+       default y if BR2_mips && BR2_TOOLCHAIN_USES_MUSL && !BR2_MIPS_CPU_MIPS32R6
+       # mips64-unknown-linux-muslabi64
+       default y if BR2_mips64 && BR2_TOOLCHAIN_USES_MUSL && BR2_MIPS_NABI64 && !BR2_MIPS_CPU_MIPS32R6
+       # mips64el-unknown-linux-muslabi64
+       default y if BR2_mips64el && BR2_TOOLCHAIN_USES_MUSL && BR2_MIPS_NABI64 && !BR2_MIPS_CPU_MIPS32R6
+       # mipsel-unknown-linux-musl
+       default y if BR2_mipsel && BR2_TOOLCHAIN_USES_MUSL && !BR2_MIPS_CPU_MIPS32R6
+       # sparc64-unknown-linux-gnu
+       default y if BR2_sparc64 && BR2_TOOLCHAIN_USES_GLIBC
+
 # All target rust packages should depend on this option
 config BR2_PACKAGE_HOST_RUSTC_TARGET_ARCH_SUPPORTS
        bool
-       # The pre-built Rust standard library is only available for the
-       # following architectures/ABIs, and is built against glibc.
-       default y if BR2_i386
-       default y if BR2_x86_64
-       default y if BR2_aarch64
-       default y if BR2_arm && !BR2_ARM_CPU_ARMV4 && !BR2_ARM_CPU_ARMV5 \
-               && !(BR2_ARM_CPU_ARMV7A && BR2_ARM_EABI)
-       default y if BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le
-       default y if (BR2_mips || BR2_mipsel) && !BR2_MIPS_CPU_MIPS32R6
-       default y if (BR2_mips64 || BR2_mips64el) && !BR2_MIPS_CPU_MIPS64R6 \
-               && BR2_MIPS_NABI64
-       depends on BR2_TOOLCHAIN_USES_GLIBC
+       default y if BR2_PACKAGE_HOST_RUSTC_TARGET_TIER1_PLATFORMS
+       default y if BR2_PACKAGE_HOST_RUSTC_TARGET_TIER2_HOST_TOOLS_PLATFORMS
+       default y if BR2_PACKAGE_HOST_RUSTC_TARGET_TIER2_PLATFORMS
        depends on BR2_PACKAGE_HOST_RUSTC_ARCH_SUPPORTS
 
 config BR2_PACKAGE_HOST_RUSTC_ARCH