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cmake: toolchain: add support for Andes GCC and Clang
Add support for the Andes GCC / Andes Clang toolchains. Enable by setting: - ZEPHYR_TOOLCHAIN_VARIANT=[andes|andes-clang] - ANDES_TOOLCHAIN_PATH=/path/to/nds32le-elf-newlib-v5 Detect Andes toolchain name using matching: nds[32|64]le-elf-[newlib|mculib]-[v5|v5e|v5f|v5d] Where ISA=nds[32|64]le, libc=[newlib|mculib], ISA/ABI=[v5|v5e|v5f|v5d]. Signed-off-by: Jimmy Zheng <jimmyzhe@andestech.com>
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‎boards/andestech/adp_xc7k_ae350/adp_xc7k_ae350.yaml‎

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@@ -4,6 +4,8 @@ type: mcu
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arch: riscv
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toolchain:
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- zephyr
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- andes
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- andes-clang
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- cross-compile
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ram: 512
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supported:

‎boards/andestech/adp_xc7k_ae350/adp_xc7k_ae350_clic.yaml‎

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arch: riscv
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toolchain:
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- zephyr
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- andes
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- andes-clang
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- cross-compile
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ram: 512
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supported:

‎boards/telink/tlsr9518adk80d/tlsr9518adk80d.yaml‎

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@@ -3,8 +3,10 @@ name: Telink TLSR9518ADK80D
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type: mcu
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arch: riscv
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toolchain:
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- cross-compile
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- zephyr
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- andes
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- andes-clang
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- cross-compile
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ram: 128
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flash: 1024
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supported:

‎cmake/toolchain/andes-clang/Kconfig‎

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# Copyright (c) 2025 Andes Technology Corporation
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# SPDX-License-Identifier: Apache-2.0
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choice LLVM_LINKER
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prompt "LLVM Linker"
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default LLVM_USE_LLD
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config LLVM_USE_LD
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bool "GNU ld"
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help
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Use binutils ld linker with llvm/clang.
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config LLVM_USE_LLD
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bool "LLVM lld"
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help
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Use LLVM built-in lld linker with llvm/clang.
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endchoice
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config TOOLCHAIN_ANDES_CLANG_SUPPORTS_THREAD_LOCAL_STORAGE
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def_bool y
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select TOOLCHAIN_SUPPORTS_THREAD_LOCAL_STORAGE
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select THREAD_LOCAL_STORAGE if CPP
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config TOOLCHAIN_ANDES_CLANG_SUPPORTS_GNU_EXTENSIONS
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def_bool y
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select TOOLCHAIN_SUPPORTS_GNU_EXTENSIONS

‎cmake/toolchain/andes-clang/Kconfig.defconfig‎

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# Copyright (c) 2025 Andes Technology Corporation
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# SPDX-License-Identifier: Apache-2.0
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config PICOLIBC_SUPPORTED
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default n

‎cmake/toolchain/andes-clang/generic.cmake‎

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# SPDX-License-Identifier: Apache-2.0
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include(${ZEPHYR_BASE}/cmake/toolchain/andes/common.cmake)
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set(COMPILER andes-clang)
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if(CONFIG_LLVM_USE_LLD)
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set(LINKER lld)
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else()
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set(LINKER ld)
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endif()
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set(BINTOOLS gnu)
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message(STATUS "Found toolchain: andes clang (${ANDES_TOOLCHAIN_PATH})")

‎cmake/toolchain/andes-clang/target.cmake‎

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# SPDX-License-Identifier: Apache-2.0
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# This file intentionally left blank.

‎cmake/toolchain/andes/Kconfig‎

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# Copyright (c) 2025 Andes Technology Corporation
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# SPDX-License-Identifier: Apache-2.0
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config TOOLCHAIN_ANDES_SUPPORTS_THREAD_LOCAL_STORAGE
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def_bool y
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select TOOLCHAIN_SUPPORTS_THREAD_LOCAL_STORAGE
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select THREAD_LOCAL_STORAGE if CPP
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config TOOLCHAIN_ANDES_SUPPORTS_GNU_EXTENSIONS
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def_bool y
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select TOOLCHAIN_SUPPORTS_GNU_EXTENSIONS

‎cmake/toolchain/andes/Kconfig.defconfig‎

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# Copyright (c) 2025 Andes Technology Corporation
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# SPDX-License-Identifier: Apache-2.0
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config PICOLIBC_SUPPORTED
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default n

‎cmake/toolchain/andes/common.cmake‎

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# SPDX-License-Identifier: Apache-2.0
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zephyr_get(ANDES_TOOLCHAIN_PATH)
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assert(ANDES_TOOLCHAIN_PATH "ANDES_TOOLCHAIN_PATH is not set")
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if(NOT EXISTS ${ANDES_TOOLCHAIN_PATH})
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message(FATAL_ERROR "Nothing found at ANDES_TOOLCHAIN_PATH: '${ANDES_TOOLCHAIN_PATH}'")
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endif()
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set(TOOLCHAIN_HOME ${ANDES_TOOLCHAIN_PATH})
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# Andes toolchain naming rule:
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# nds[32|64]-[elf|linux]-[mculib|newlib|glibc]-[v5e|v5|v5f|v5d]
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# The kernel configuration must match the toolchain for ABI
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cmake_path(GET ANDES_TOOLCHAIN_PATH FILENAME TOOLCHAIN_BASENAME)
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string(REPLACE "-" ";" TOOLCHAIN_PARTS "${TOOLCHAIN_BASENAME}")
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list(GET TOOLCHAIN_PARTS 0 TOOLCHAIN_ARCH) # nds32le / nds64le
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list(GET TOOLCHAIN_PARTS 1 TOOLCHAIN_ENV) # elf / linux
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list(GET TOOLCHAIN_PARTS 2 TOOLCHAIN_LIBC) # mculib / newlib / glibc
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list(GET TOOLCHAIN_PARTS 3 TOOLCHAIN_ISA) # v5e / v5 / v5f / v5d
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# Check toolchain architecture
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if(TOOLCHAIN_ARCH STREQUAL "nds32le" AND CONFIG_64BIT)
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message(FATAL_ERROR "'${TOOLCHAIN_BASENAME}' (riscv32) requires CONFIG_64BIT=n")
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elseif(TOOLCHAIN_ARCH STREQUAL "nds64le" AND NOT CONFIG_64BIT)
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message(FATAL_ERROR "'${TOOLCHAIN_BASENAME}' (riscv64) requires CONFIG_64BIT=y")
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endif()
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# Check toolchain environment
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if(NOT TOOLCHAIN_ENV STREQUAL "elf")
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message(FATAL_ERROR "'${TOOLCHAIN_BASENAME}' uses '${TOOLCHAIN_ENV}', only 'elf' is supported")
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endif()
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# Check toolchain libc
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if(TOOLCHAIN_LIBC STREQUAL "newlib")
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set(TOOLCHAIN_HAS_NEWLIB ON CACHE BOOL "True if toolchain supports newlib")
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endif()
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# Check toolchain ISA
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if(TOOLCHAIN_ISA STREQUAL "v5e" AND NOT CONFIG_RISCV_ISA_RV32E)
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message(FATAL_ERROR "'${TOOLCHAIN_BASENAME}' (v5e) requires CONFIG_RISCV_ISA_RV32E=y")
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elseif(TOOLCHAIN_ISA STREQUAL "v5" AND CONFIG_FLOAT_HARD)
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message(FATAL_ERROR "'${TOOLCHAIN_BASENAME}' (v5) requires CONFIG_FLOAT_HARD=n")
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elseif(TOOLCHAIN_ISA STREQUAL "v5f" AND NOT (CONFIG_FLOAT_HARD AND CONFIG_RISCV_ISA_EXT_F))
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message(FATAL_ERROR "'${TOOLCHAIN_BASENAME}' (v5f) requires CONFIG_FLOAT_HARD=y and CONFIG_RISCV_ISA_EXT_F=y")
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elseif(TOOLCHAIN_ISA STREQUAL "v5d" AND NOT (CONFIG_FLOAT_HARD AND CONFIG_RISCV_ISA_EXT_D))
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message(FATAL_ERROR "'${TOOLCHAIN_BASENAME}' (v5d) requires CONFIG_FLOAT_HARD=y and CONFIG_RISCV_ISA_EXT_D=y")
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endif()
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if(CONFIG_64BIT)
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set(triple riscv64-elf)
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else()
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set(triple riscv32-elf)
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endif()
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set(CROSS_COMPILE_TARGET ${triple})
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set(SYSROOT_TARGET ${triple})
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set(CROSS_COMPILE ${TOOLCHAIN_HOME}/bin/${CROSS_COMPILE_TARGET}-)
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set(SYSROOT_DIR ${TOOLCHAIN_HOME}/${SYSROOT_TARGET})

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