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Oct 28, 2025
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Add LLVM/Clang toolchain support with auto-detection #31

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56 changes: 40 additions & 16 deletions arch/riscv/build.mk
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Original file line number Diff line number Diff line change
Expand Up @@ -17,27 +17,51 @@ DEFINES := -DF_CPU=$(F_CLK) \
-DF_TIMER=$(F_TICK) \
-include config.h

ASFLAGS = -march=rv32imzicsr -mabi=ilp32
CFLAGS += -Wall -Wextra -Wshadow -Wno-unused-parameter -Werror
CROSS_COMPILE ?= riscv-none-elf-

# Detect LLVM/Clang toolchain (allow user override)
CC_IS_CLANG ?= $(shell $(CROSS_COMPILE)clang --version 2>/dev/null | grep -qi clang && echo 1)

# Architecture flags
ARCH_FLAGS = -march=rv32imzicsr -mabi=ilp32

# Common compiler flags
CFLAGS += -Wall -Wextra -Werror -Wshadow -Wno-unused-parameter
CFLAGS += -O2 -std=gnu99
CFLAGS += -march=rv32imzicsr -mabi=ilp32
CFLAGS += $(ARCH_FLAGS)
CFLAGS += -mstrict-align -ffreestanding -nostdlib -fomit-frame-pointer
CFLAGS += $(INC_DIRS) $(DEFINES) -fdata-sections -ffunction-sections
ARFLAGS = r

# Linker flags
LDFLAGS = -melf32lriscv --gc-sections
LDSCRIPT = $(ARCH_DIR)/riscv32-qemu.ld
ifeq ($(CC_IS_CLANG),1)
CC = $(CROSS_COMPILE)clang
AS = $(CROSS_COMPILE)clang
LD = $(CROSS_COMPILE)ld.lld
DUMP = $(CROSS_COMPILE)llvm-objdump -M no-aliases
READ = $(CROSS_COMPILE)llvm-readelf
OBJ = $(CROSS_COMPILE)llvm-objcopy
SIZE = $(CROSS_COMPILE)llvm-size

CROSS_COMPILE ?= riscv-none-elf-
CC = $(CROSS_COMPILE)gcc
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
DUMP = $(CROSS_COMPILE)objdump -Mno-aliases
READ = $(CROSS_COMPILE)readelf
OBJ = $(CROSS_COMPILE)objcopy
SIZE = $(CROSS_COMPILE)size
AR = $(CROSS_COMPILE)ar
CFLAGS += --target=riscv32-unknown-elf
CFLAGS += -Wno-unused-command-line-argument
ASFLAGS = --target=riscv32-unknown-elf
LDFLAGS = -m elf32lriscv
else
CC = $(CROSS_COMPILE)gcc
AS = $(CROSS_COMPILE)as
LD = $(CROSS_COMPILE)ld
DUMP = $(CROSS_COMPILE)objdump -Mno-aliases
READ = $(CROSS_COMPILE)readelf
OBJ = $(CROSS_COMPILE)objcopy
SIZE = $(CROSS_COMPILE)size
LDFLAGS = -melf32lriscv
endif

AR = $(CROSS_COMPILE)ar
ASFLAGS += $(ARCH_FLAGS)
LDFLAGS += --gc-sections

ARFLAGS = r
LDSCRIPT = $(ARCH_DIR)/riscv32-qemu.ld

HAL_OBJS := boot.o hal.o muldiv.o
HAL_OBJS := $(addprefix $(BUILD_KERNEL_DIR)/,$(HAL_OBJS))
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