mirror of
https://github.com/RIOT-OS/RIOT.git
synced 2024-12-29 04:50:03 +01:00
287280f882
This fixes issues with `make compile-commands`, as this by default generates clangd/LLVM compatible flags. Without `TARGET_ARCH_LLVM` exported, this will fall back to `TARGET_ARCH`, which is different for LLVM and GCC.
99 lines
3.5 KiB
Makefile
99 lines
3.5 KiB
Makefile
# Target architecture for the build.
|
|
|
|
# The correct triple for 32 bit embedded RISC-V targets is "riscv32-none-elf".
|
|
# However, is unknown is used as sys (in place of none), it will also fall back
|
|
# to none. Finally, if the GCC RISC-V cross compiler is compiled with full
|
|
# multilib support, it can create both 32 bit and 64 bit binaries. Often this is
|
|
# indicated with "riscv" being used instead of "riscv32/riscv64", but e.g.
|
|
# Ubuntu uses "riscv64-unknown-elf" despite being able to produce both 32 and
|
|
# 64 bit binaries. We'll test all possible combinations from the most correct
|
|
# triple to the least correct triple all that might be able to produce our
|
|
# binaries. Finally, "riscv-none-embed" is also tested for compatibility with
|
|
# an previously popular legacy toolchain.
|
|
# For a CI transition period, it is tested first.
|
|
|
|
_TRIPLES_TO_TEST := \
|
|
riscv-none-embed \
|
|
riscv32-none-elf \
|
|
riscv32-unknown-elf \
|
|
riscv32-elf \
|
|
riscv-none-elf \
|
|
riscv-unknown-elf \
|
|
riscv-elf \
|
|
riscv64-none-elf \
|
|
riscv64-unknown-elf \
|
|
riscv64-elf
|
|
|
|
# Do not test at run time if building with docker: The host may have no
|
|
# RISC-V toolchain installed or a different one
|
|
ifeq (1,$(BUILD_IN_DOCKER))
|
|
TARGET_ARCH_RISCV := riscv-none-embed
|
|
endif
|
|
|
|
TARGET_ARCH_RISCV ?= \
|
|
$(strip \
|
|
$(subst -gcc,,\
|
|
$(notdir \
|
|
$(word 1,\
|
|
$(shell which $(addsuffix -gcc,$(_TRIPLES_TO_TEST)) 2> /dev/null)))))
|
|
|
|
TARGET_ARCH ?= $(TARGET_ARCH_RISCV)
|
|
|
|
# Convert to a simply expanded variable here, as a recursively expended
|
|
# variable would result in detecting the toolchain each and every time again the
|
|
# toolchain is referenced.
|
|
TARGET_ARCH := $(TARGET_ARCH)
|
|
|
|
ifeq (,$(TARGET_ARCH))
|
|
$(error No RISC-V toolchain detected. Make sure a RISC-V toolchain is installed.)
|
|
endif
|
|
|
|
ifeq ($(TOOLCHAIN),gnu)
|
|
GCC_DEFAULTS_TO_NEW_RISCV_ISA ?= $(shell echo "typedef int dont_be_pedantic;" | $(TARGET_ARCH)-gcc -march=rv32imac -mabi=ilp32 -misa-spec=2.2 -E - > /dev/null 2>&1 && echo 1 || echo 0)
|
|
endif
|
|
|
|
GCC_DEFAULTS_TO_NEW_RISCV_ISA ?= 0
|
|
|
|
CFLAGS_CPU := -march=rv32imac -mabi=ilp32
|
|
|
|
# Since RISC-V ISA specifications 20191213 instructions previously included in
|
|
# rv32imac have been moved to the ZICSR extension. See
|
|
# https://riscv.org/wp-content/uploads/2019/12/riscv-spec-20191213.pdf
|
|
#
|
|
# Select the oldest ISA spec in which ZICSR was not yet split out into an
|
|
# extension
|
|
ifeq (1,$(GCC_DEFAULTS_TO_NEW_RISCV_ISA))
|
|
CFLAGS_CPU += -misa-spec=2.2
|
|
endif
|
|
|
|
# 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
|
|
ifneq ($(TOOLCHAIN),llvm)
|
|
CFLAGS_CPU += -mcmodel=medlow -msmall-data-limit=8
|
|
# We cannot invoke the compiler on the host system if build in docker.
|
|
# Instead, hard-code the required flags for the docker toolchain here
|
|
ifeq (1,$(BUILD_IN_DOCKER))
|
|
CFLAGS_CPU += -malign-data=natural
|
|
else
|
|
ifneq (,$(shell $(TARGET_ARCH)-gcc --help=target | grep '\-malign-data='))
|
|
CFLAGS_CPU += -malign-data=natural
|
|
endif
|
|
endif
|
|
endif
|
|
CFLAGS_LINK = -ffunction-sections -fdata-sections
|
|
CFLAGS_DBG ?= -g3
|
|
CFLAGS_OPT ?= -Os
|
|
|
|
LINKFLAGS += -L$(RIOTCPU)/$(CPU)/ldscripts -L$(RIOTCPU)/riscv_common/ldscripts
|
|
LINKER_SCRIPT ?= $(CPU_MODEL).ld
|
|
LINKFLAGS += -T$(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) -nostartfiles -Wl,--gc-sections -static -lgcc
|
|
|
|
# Platform triple as used by Rust
|
|
RUST_TARGET = riscv32imac-unknown-none-elf
|