forked from Mirrors/opensbi
Makefile: Support building with Clang and LLVM binutils
This is intended to mirror the Linux kernel. Building with CC=clang will use Clang as the compiler but default to using the existing binutils. Building with LLVM=1 will default to using Clang and LLVM binutils. Whilst GCC will accept the -N linker option and forward it on to the linker, Clang will not, and so in order to support both compilers we must use -Wl, to forward it to the linker as is required for most other linker options. Note that there is currently a bug when using Clang as the compiler and riscv64-linux-gnu-ld as the linker for FW_PIC=y. At first glance this appears to be a bug in GNU binutils, but this could also be Clang or OpenSBI at fault in some subtle way. Thus, for now, advise that this combination be avoided. Signed-off-by: Jessica Clarke <jrtc27@jrtc27.com> Reviewed-by: Anup Patel <anup.patel@wdc.com> Tested-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Jessica Clarke
committed by
Anup Patel
Anup Patel
parent
09ad811ec4
commit
2942777425
66
Makefile
66
Makefile
@@ -76,26 +76,54 @@ OPENSBI_VERSION_MINOR=`grep "define OPENSBI_VERSION_MINOR" $(include_dir)/sbi/sb
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OPENSBI_VERSION_GIT=$(shell if [ -d $(src_dir)/.git ]; then git describe 2> /dev/null; fi)
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# Setup compilation commands
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ifneq ($(LLVM),)
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CC = clang
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AR = llvm-ar
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LD = ld.lld
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OBJCOPY = llvm-objcopy
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else
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ifdef CROSS_COMPILE
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CC = $(CROSS_COMPILE)gcc
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CPP = $(CROSS_COMPILE)cpp
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AR = $(CROSS_COMPILE)ar
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LD = $(CROSS_COMPILE)ld
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OBJCOPY = $(CROSS_COMPILE)objcopy
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else
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CC ?= gcc
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CPP ?= cpp
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AR ?= ar
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LD ?= ld
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OBJCOPY ?= objcopy
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endif
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endif
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CPP = $(CC) -E
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AS = $(CC)
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DTC = dtc
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# Guess the compillers xlen
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OPENSBI_CC_XLEN := $(shell TMP=`$(CC) -dumpmachine | sed 's/riscv\([0-9][0-9]\).*/\1/'`; echo $${TMP})
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ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
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CC_IS_CLANG = y
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else
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CC_IS_CLANG = n
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endif
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ifneq ($(shell $(LD) --version 2>&1 | head -n 1 | grep LLD),)
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LD_IS_LLD = y
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else
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LD_IS_LLD = n
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endif
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ifeq ($(CC_IS_CLANG),y)
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ifneq ($(CROSS_COMPILE),)
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CLANG_TARGET = --target=$(notdir $(CROSS_COMPILE:%-=%))
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endif
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endif
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# Guess the compiler's XLEN
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OPENSBI_CC_XLEN := $(shell TMP=`$(CC) $(CLANG_TARGET) -dumpmachine | sed 's/riscv\([0-9][0-9]\).*/\1/'`; echo $${TMP})
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# Guess the compiler's ABI and ISA
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ifneq ($(CC_IS_CLANG),y)
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OPENSBI_CC_ABI := $(shell TMP=`$(CC) -v 2>&1 | sed -n 's/.*\(with\-abi=\([a-zA-Z0-9]*\)\).*/\2/p'`; echo $${TMP})
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OPENSBI_CC_ISA := $(shell TMP=`$(CC) -v 2>&1 | sed -n 's/.*\(with\-arch=\([a-zA-Z0-9]*\)\).*/\2/p'`; echo $${TMP})
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endif
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# Setup platform XLEN
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ifndef PLATFORM_RISCV_XLEN
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@@ -106,8 +134,21 @@ ifndef PLATFORM_RISCV_XLEN
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endif
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endif
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ifeq ($(CC_IS_CLANG),y)
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ifeq ($(CROSS_COMPILE),)
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CLANG_TARGET = --target=riscv$(PLATFORM_RISCV_XLEN)-unknown-elf
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endif
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endif
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ifeq ($(LD_IS_LLD),y)
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RELAX_FLAG = -mno-relax
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USE_LD_FLAG = -fuse-ld=lld
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else
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USE_LD_FLAG = -fuse-ld=bfd
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endif
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# Check whether the linker supports creating PIEs
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OPENSBI_LD_PIE := $(shell $(CC) -fPIE -nostdlib -Wl,-pie -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo y || echo n)
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OPENSBI_LD_PIE := $(shell $(CC) $(CLANG_TARGET) $(RELAX_FLAG) $(USE_LD_FLAG) -fPIE -nostdlib -Wl,-pie -x c /dev/null -o /dev/null >/dev/null 2>&1 && echo y || echo n)
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# Setup list of objects.mk files
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ifdef PLATFORM
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@@ -197,7 +238,11 @@ else
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endif
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# Setup compilation commands flags
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GENFLAGS = -I$(platform_src_dir)/include
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ifeq ($(CC_IS_CLANG),y)
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GENFLAGS += $(CLANG_TARGET)
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GENFLAGS += -Wno-unused-command-line-argument
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endif
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GENFLAGS += -I$(platform_src_dir)/include
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GENFLAGS += -I$(include_dir)
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ifneq ($(OPENSBI_VERSION_GIT),)
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GENFLAGS += -DOPENSBI_VERSION_GIT="\"$(OPENSBI_VERSION_GIT)\""
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@@ -211,6 +256,7 @@ CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
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CFLAGS += -mno-save-restore -mstrict-align
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CFLAGS += -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)
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CFLAGS += -mcmodel=$(PLATFORM_RISCV_CODE_MODEL)
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CFLAGS += $(RELAX_FLAG)
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CFLAGS += $(GENFLAGS)
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CFLAGS += $(platform-cflags-y)
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CFLAGS += -fno-pie -no-pie
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@@ -225,18 +271,24 @@ ASFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
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ASFLAGS += -mno-save-restore -mstrict-align
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ASFLAGS += -mabi=$(PLATFORM_RISCV_ABI) -march=$(PLATFORM_RISCV_ISA)
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ASFLAGS += -mcmodel=$(PLATFORM_RISCV_CODE_MODEL)
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ASFLAGS += $(RELAX_FLAG)
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ASFLAGS += $(GENFLAGS)
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ASFLAGS += $(platform-asflags-y)
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ASFLAGS += $(firmware-asflags-y)
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ARFLAGS = rcs
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ELFFLAGS += -Wl,--build-id=none -N -static-libgcc -lgcc
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ELFFLAGS += $(USE_LD_FLAG)
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ELFFLAGS += -Wl,--build-id=none -Wl,-N -static-libgcc -lgcc
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ELFFLAGS += $(platform-ldflags-y)
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ELFFLAGS += $(firmware-ldflags-y)
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MERGEFLAGS += -r
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ifeq ($(LD_IS_LLD),y)
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MERGEFLAGS += -b elf
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else
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MERGEFLAGS += -b elf$(PLATFORM_RISCV_XLEN)-littleriscv
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endif
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MERGEFLAGS += -m elf$(PLATFORM_RISCV_XLEN)lriscv
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DTSCPPFLAGS = $(CPPFLAGS) -nostdinc -nostdlib -fno-builtin -D__DTS__ -x assembler-with-cpp
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