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This invocation would break: make -C examples/sw/led/ CC=/opt/lowrisc-toolchain-gcc-rv32imc-20210412-1/bin/riscv32-unknown-elf-gcc because the "-gcc" occurence inside the directory name would also be replaced. Fix by first deriving CROSS_COMPILE from CC, then conditionally build other tool file names/paths. Signed-off-by: Leon Woestenberg <leon@sidebranch.com>
60 lines
1.5 KiB
Makefile
60 lines
1.5 KiB
Makefile
# Copyright lowRISC contributors.
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# Licensed under the Apache License, Version 2.0, see LICENSE for details.
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# SPDX-License-Identifier: Apache-2.0
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#
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# Generate a baremetal application
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PROGRAM ?= led
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PROGRAM_CFLAGS = -Wall -g -Os
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ARCH = rv32imc
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# ARCH = rv32im # to disable compressed instructions
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SRCS = $(PROGRAM).c
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CC = riscv32-unknown-elf-gcc
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CROSS_COMPILE = $(patsubst %-gcc,%-,$(CC))
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OBJCOPY ?= $(CROSS_COMPILE)objcopy
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OBJDUMP ?= $(CROSS_COMPILE)objdump
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LINKER_SCRIPT ?= link.ld
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CRT ?= crt0.S
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CFLAGS ?= -march=$(ARCH) -mabi=ilp32 -static -mcmodel=medany \
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-fvisibility=hidden -nostdlib -nostartfiles $(PROGRAM_CFLAGS)
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OBJS := ${SRCS:.c=.o} ${CRT:.S=.o}
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DEPS = $(OBJS:%.o=%.d)
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OUTFILES = $(PROGRAM).elf $(PROGRAM).vmem $(PROGRAM).bin $(PROGRAM).dis
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all: $(OUTFILES)
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$(PROGRAM).elf: $(OBJS) $(LINKER_SCRIPT)
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$(CC) $(CFLAGS) -T $(LINKER_SCRIPT) $(OBJS) -o $@ $(LIBS)
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%.dis: %.elf
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$(OBJDUMP) -SD $^ > $@
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# Note: this target requires the srecord package to be installed.
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# XXX: This could be replaced by objcopy once
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# https://sourceware.org/bugzilla/show_bug.cgi?id=19921
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# is widely available.
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# XXX: Currently the start address 0x00000000 is hardcoded. It could/should be
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# read from the elf file, but is lost in the bin file.
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# Switching to objcopy will resolve that as well.
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%.vmem: %.bin
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srec_cat $^ -binary -offset 0x0000 -byte-swap 4 -o $@ -vmem
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%.bin: %.elf
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$(OBJCOPY) -O binary $^ $@
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%.o: %.c
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$(CC) $(CFLAGS) -MMD -c $(INCS) -o $@ $<
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%.o: %.S
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$(CC) $(CFLAGS) -MMD -c $(INCS) -o $@ $<
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clean:
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$(RM) -f *.o *.d
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distclean: clean
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$(RM) -f $(OUTFILES)
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