# Use clang / llvm toolchain
#
CC = clang
CXX = clang++
LD   = ld.lld
SIZE = llvm-size
AS   = riscv64-unknown-elf-as -mno-relax
DUMP = riscv64-unknown-elf-objdump
COPY = riscv64-unknown-elf-objcopy

OBJS  += startup.o system.o
CCPU   = -march=rv32imac -mabi=ilp32
MCPU   = $(CCPU)
TRIP   = riscv32-unknown-none-elf
CFLAGS+= -Oz
#CFLAGS+= -flto
CFLAGS+= -fmessage-length=0 -fsigned-char -I/usr/include/newlib
#CFLAGS+= -fconstexpr-steps=2097152
CFLAGS+= --target=$(TRIP) $(MCPU)
LFLAGS+= --Map=$(@:%.elf=%.map) --gc-sections
# 16-bit instrukce se do toho asi dostanou až na úrovni LLVM linkeru.
# Bohužel to není nikde pořádně popsáno.
LFLAGS+= -mllvm -mattr=+c
#LFLAGS+= -lto-O3
LFLAGS+= -nostdlib
LDLIBS+= -L./$(TARGET) -T generated_CH32V203F6P6.ld