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buildroot/arch/arch.mk.riscv

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arch: add support for RISC-V 64-bit (riscv64) architecture This enables a riscv64 system to be built with a Buildroot generated toolchain (gcc >= 7.x, binutils >= 2.30, glibc only). This configuration has been used to successfully build a qemu-bootable riscv-linux-4.15 kernel (https://github.com/riscv/riscv-linux.git). Signed-off-by: Mark Corbin <mark.corbin@embecosm.com> [Thomas: - simplify arch.mk.riscv by directly setting GCC_TARGET_ARCH - simplify glibc.mk changes by using GLIBC_CONF_ENV.] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2018-09-12 12:22:54 +02:00
#
# Configure the GCC_TARGET_ARCH variable and append the
# appropriate RISC-V ISA extensions.
#
ifeq ($(BR2_riscv),y)
ifeq ($(BR2_ARCH_IS_64),y)
GCC_TARGET_ARCH := rv64i
endif
ifeq ($(BR2_RISCV_ISA_RVM),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)m
endif
ifeq ($(BR2_RISCV_ISA_RVA),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)a
endif
ifeq ($(BR2_RISCV_ISA_RVF),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)f
endif
ifeq ($(BR2_RISCV_ISA_RVD),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)d
endif
ifeq ($(BR2_RISCV_ISA_RVC),y)
GCC_TARGET_ARCH := $(GCC_TARGET_ARCH)c
endif
endif