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fe310: Support the LLVM toolchain (i.e. compilation with clang)

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This requires -nostartfiles to be only passed to the linker, not the
compiler, as it is a linker flag and passing it to the compiler causes a
clang warning to be emitted.

Additionally, clang does not seem to support `-mcmodel=medlow` and
`-msmall-data-limit=8` but these options do not seem strictly necessary
to me anyhow thus they are deactivated conditionally when using clang.
This commit is contained in:
Sören Tempel 2020-10-07 07:37:52 +00:00
parent 3a9f8d5851
commit 125e4b54c1
2 changed files with 12 additions and 3 deletions
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2
cpu/riscv_common/Makefile.include
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@ -1,6 +1,8 @@
CFLAGS += -Wno-pedantic
INCLUDES += -I$(RIOTCPU)/riscv_common/include
TOOLCHAINS_SUPPORTED = gnu llvm
# All variables must be defined in the CPU configuration when using the common
# `ldscripts/riscv.ld`
ifneq (,$(ROM_START_ADDR)$(RAM_START_ADDR)$(ROM_LEN)$(RAM_LEN))

13
makefiles/arch/riscv.inc.mk
View File

@ -30,8 +30,15 @@ TARGET_ARCH_RISCV ?= \
TARGET_ARCH ?= $(TARGET_ARCH_RISCV)
# define build specific options
CFLAGS_CPU = -march=rv32imac -mabi=ilp32 -mcmodel=medlow -msmall-data-limit=8
CFLAGS_LINK = -nostartfiles -ffunction-sections -fdata-sections
CFLAGS_CPU = -march=rv32imac -mabi=ilp32
ifeq ($(TOOLCHAIN),llvm)
# Always use riscv32-none-elf as target triple for clang, as some
# autodetected gcc target triples are incompatible with clang
TARGET_ARCH_LLVM := riscv32-none-elf
else
CFLAGS_CPU += -mcmodel=medlow -msmall-data-limit=8
endif
CFLAGS_LINK = -ffunction-sections -fdata-sections
CFLAGS_DBG ?= -g3
CFLAGS_OPT ?= -Os
@ -42,4 +49,4 @@ LINKFLAGS += -T$(LINKER_SCRIPT)
CFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG) $(CFLAGS_OPT) $(CFLAGS_LINK)
ASFLAGS += $(CFLAGS_CPU) $(CFLAGS_DBG)
# export linker flags
LINKFLAGS += $(CFLAGS_CPU) $(CFLAGS_LINK) $(CFLAGS_DBG) $(CFLAGS_OPT) -Wl,--gc-sections -static -lgcc
LINKFLAGS += $(CFLAGS_CPU) $(CFLAGS_LINK) $(CFLAGS_DBG) $(CFLAGS_OPT) -nostartfiles -Wl,--gc-sections -static -lgcc