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# /***************************************************************************
# * Copyright (C) 2026 Eclipse ThreadX contributors
# *
# * This program and the accompanying materials are made available under the
# * terms of the MIT License which is available at
# * https://opensource.org/licenses/MIT.
# *
# * SPDX-License-Identifier: MIT
# ***************************************************************************/
# CMake toolchain file for RV32GC targets (QEMU virt, etc.)
#
# Uses the dedicated riscv32-unknown-elf-gcc bare-metal toolchain from
# riscv-collab (riscv32-elf-ubuntu-24.04-gcc.tar.xz, installs to /opt/riscv
# via scripts/install_riscv.sh).
#
# IMPORTANT: the riscv-collab riscv32-elf toolchain is built
# --disable-multilib --with-abi=ilp32d, so its libgcc only provides
# ilp32d (hardware double-FP) helpers. This cmake file therefore targets
# rv32gc/ilp32d, which matches the toolchain's built-in ABI and works
# correctly with QEMU virt (which emulates hardware FP).
#
# Do NOT use this file for bare-metal targets that lack hardware FP (e.g.
# CV32E40P, rv32imc). For those, use cmake/riscv64-ubuntu-rv32imc.cmake
# which calls the Ubuntu gcc-riscv64-unknown-elf package — a multilib build
# that includes the rv32im/ilp32 (soft-float) libgcc variant.
#
# Target ISA : rv32gc (integer, multiply, atomics, FP, compressed, Zicsr)
# ABI : ilp32d (32-bit int/long/ptr, hardware double-precision FP)
# Code model : medlow (addresses in [0, 2 GiB))
set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_SYSTEM_PROCESSOR riscv)
set(THREADX_ARCH "risc-v32")
set(THREADX_TOOLCHAIN "gnu")
set(ARCH_FLAGS "-march=rv32gc -mabi=ilp32d -mcmodel=medlow")
set(CFLAGS "${ARCH_FLAGS}")
set(ASFLAGS "${ARCH_FLAGS}")
set(LDFLAGS "${ARCH_FLAGS}")
# Dedicated riscv32 bare-metal toolchain (riscv-collab riscv32-elf release).
set(CMAKE_C_COMPILER riscv32-unknown-elf-gcc)
set(CMAKE_CXX_COMPILER riscv32-unknown-elf-g++)
set(AS riscv32-unknown-elf-as)
set(AR riscv32-unknown-elf-ar)
set(OBJCOPY riscv32-unknown-elf-objcopy)
set(OBJDUMP riscv32-unknown-elf-objdump)
set(SIZE riscv32-unknown-elf-size)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
# Use static library for compiler feature probing (no linker script yet)
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
set(CMAKE_C_FLAGS "${CFLAGS}" CACHE INTERNAL "c compiler flags")
set(CMAKE_CXX_FLAGS "${CFLAGS}" CACHE INTERNAL "cxx compiler flags")
set(CMAKE_ASM_FLAGS "${ASFLAGS} -D__ASSEMBLER__" CACHE INTERNAL "asm compiler flags")
set(CMAKE_EXE_LINKER_FLAGS "${LDFLAGS}" CACHE INTERNAL "exe link flags")
set(CMAKE_C_FLAGS_DEBUG "-Og -g -ggdb3" CACHE INTERNAL "c debug flags")
set(CMAKE_CXX_FLAGS_DEBUG "-Og -g -ggdb3" CACHE INTERNAL "cxx debug flags")
set(CMAKE_ASM_FLAGS_DEBUG "-g -ggdb3" CACHE INTERNAL "asm debug flags")
set(CMAKE_C_FLAGS_RELEASE "-Os" CACHE INTERNAL "c release flags")
set(CMAKE_CXX_FLAGS_RELEASE "-Os" CACHE INTERNAL "cxx release flags")
set(CMAKE_ASM_FLAGS_RELEASE "" CACHE INTERNAL "asm release flags")
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
# Use static library for compiler feature probing (no linker script yet)
set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
set(CMAKE_C_FLAGS "${CFLAGS}" CACHE INTERNAL "c compiler flags")
set(CMAKE_CXX_FLAGS "${CFLAGS}" CACHE INTERNAL "cxx compiler flags")
set(CMAKE_ASM_FLAGS "${ASFLAGS} -D__ASSEMBLER__" CACHE INTERNAL "asm compiler flags")
set(CMAKE_EXE_LINKER_FLAGS "${LDFLAGS}" CACHE INTERNAL "exe link flags")
set(CMAKE_C_FLAGS_DEBUG "-Og -g -ggdb3" CACHE INTERNAL "c debug flags")
set(CMAKE_CXX_FLAGS_DEBUG "-Og -g -ggdb3" CACHE INTERNAL "cxx debug flags")
set(CMAKE_ASM_FLAGS_DEBUG "-g -ggdb3" CACHE INTERNAL "asm debug flags")
set(CMAKE_C_FLAGS_RELEASE "-Os" CACHE INTERNAL "c release flags")
set(CMAKE_CXX_FLAGS_RELEASE "-Os" CACHE INTERNAL "cxx release flags")
set(CMAKE_ASM_FLAGS_RELEASE "" CACHE INTERNAL "asm release flags")
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