mirror of
https://github.com/openwrt/openwrt.git
synced 2026-10-13 00:17:02 +04:00
Paul Spooren
6c03a267b0
CompileBPF calls clang with -g but without any prefix map. Stripping debug info keeps .BTF and .BTF.ext, since libbpf needs them, and their line info carries the absolute path of each source file. This makes BPF objects like qosify-bpf.o depend on the build directory and breaks reproducibility: -/builder/shared-workdir/build/build_dir/.../qosify-bpf.c +/tmp/rebuilderd-openwrt.juCsuQ/src/build_dir/.../qosify-bpf.c IREMAP_CFLAGS is not enough here: without CONFIG_REPRODUCIBLE_DEBUG_INFO it only sets -fmacro-prefix-map, which leaves the line info alone, and it is empty for external toolchains, which have no say over the host clang. Unlike regular debug info, BTF ships with the package, so always pass -ffile-prefix-map for the build and staging directories. Add an fremap helper next to iremap for that, and let IREMAP_STAGING_DIR and CompileBPF share the map of the staging directory, so they cannot drift apart. Link: https://github.com/openwrt/openwrt/pull/25359 Signed-off-by: Paul Spooren <mail@aparcar.org>
101 lines
3.7 KiB
Makefile
101 lines
3.7 KiB
Makefile
BPF_DEPENDS := @HAS_BPF_TOOLCHAIN +@NEED_BPF_TOOLCHAIN
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CLANG_MIN_VER:=12
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ifneq ($(CONFIG_USE_LLVM_HOST),)
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find-llvm-tool=$(firstword $(shell PATH='$(BPF_PATH)' command -v $(1) || echo '$(firstword $(1))-not-found'))
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BPF_TOOLCHAIN_HOST_PATH:=$(call qstrip,$(CONFIG_BPF_TOOLCHAIN_HOST_PATH))
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ifneq ($(BPF_TOOLCHAIN_HOST_PATH),)
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BPF_PATH:=$(BPF_TOOLCHAIN_HOST_PATH)/bin:$(PATH)
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else
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BPF_PATH:=$(PATH)
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endif
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CLANG:=$(call find-llvm-tool,clang clang-13 clang-12)
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LLVM_VER:=$(subst clang,,$(notdir $(CLANG)))
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BPF_PATH:=$(dir $(CLANG)):$(BPF_PATH)
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LLVM_LLC:=$(call find-llvm-tool,llc$(LLVM_VER))
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LLVM_DIS:=$(call find-llvm-tool,llvm-dis$(LLVM_VER))
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LLVM_OPT:=$(call find-llvm-tool,opt$(LLVM_VER))
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LLVM_STRIP:=$(call find-llvm-tool,llvm-strip$(LLVM_VER))
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else
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LLVM_PATH:=/invalid
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ifneq ($(CONFIG_USE_LLVM_PREBUILT),)
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LLVM_PATH:=$(TOPDIR)/llvm-bpf/bin
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endif
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ifneq ($(CONFIG_USE_LLVM_BUILD),)
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LLVM_PATH:=$(STAGING_DIR_HOST)/llvm-bpf/bin
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endif
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CLANG:=$(LLVM_PATH)/clang
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LLVM_LLC:=$(LLVM_PATH)/llc
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LLVM_DIS:=$(LLVM_PATH)/llvm-dis
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LLVM_OPT:=$(LLVM_PATH)/opt
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LLVM_STRIP:=$(LLVM_PATH)/llvm-strip
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endif
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BPF_KARCH:=mips
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BPF_ARCH:=mips$(if $(CONFIG_ARCH_64BIT),64)$(if $(CONFIG_BIG_ENDIAN),,el)
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BPF_TARGET:=bpf$(if $(CONFIG_BIG_ENDIAN),eb,el)
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BPF_HEADERS_DIR:=$(STAGING_DIR)/bpf-headers
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BPF_KERNEL_INCLUDE := \
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-nostdinc -isystem $(TOOLCHAIN_ROOT_DIR)/lib/gcc/*/*/include \
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$(patsubst %,-isystem%,$(TOOLCHAIN_INC_DIRS)) \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/asm/mach-generic \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated \
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-I$(BPF_HEADERS_DIR)/include \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/uapi \
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-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated/uapi \
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-I$(BPF_HEADERS_DIR)/include/uapi \
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-I$(BPF_HEADERS_DIR)/include/generated/uapi \
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-I$(BPF_HEADERS_DIR)/tools/lib \
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-I$(BPF_HEADERS_DIR)/tools/testing/selftests \
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-I$(BPF_HEADERS_DIR)/samples/bpf \
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-include linux/kconfig.h -include asm_goto_workaround.h
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BPF_CFLAGS := \
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$(BPF_KERNEL_INCLUDE) -I$(PKG_BUILD_DIR) \
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-D__KERNEL__ -D__BPF_TRACING__ -DCONFIG_GENERIC_CSUM \
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-D__TARGET_ARCH_${BPF_KARCH} \
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-m$(if $(CONFIG_BIG_ENDIAN),big,little)-endian \
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-fno-stack-protector -Wall \
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-Wno-unused-value -Wno-pointer-sign \
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-Wno-compare-distinct-pointer-types \
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-Wno-gnu-variable-sized-type-not-at-end \
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-Wno-address-of-packed-member -Wno-tautological-compare \
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-Wno-unknown-warning-option \
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-fno-asynchronous-unwind-tables \
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-Wno-uninitialized -Wno-unused-variable \
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-Wno-unused-label \
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-O2 -emit-llvm -Xclang -disable-llvm-passes
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BPF_IREMAP_CFLAGS := \
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$(call fremap,$(PKG_BUILD_DIR),$(notdir $(PKG_BUILD_DIR))) \
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$(call remap_staging_dir,fremap)
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ifneq ($(CONFIG_HAS_BPF_TOOLCHAIN),)
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ifeq ($(DUMP)$(filter download refresh,$(MAKECMDGOALS)),)
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CLANG_VER:=$(shell $(CLANG) --target=$(BPF_TARGET) -dM -E - < /dev/null | grep __clang_major__ | cut -d' ' -f3)
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CLANG_VER_VALID:=$(shell [ "$(CLANG_VER)" -ge "$(CLANG_MIN_VER)" ] && echo 1 )
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ifeq ($(CLANG_VER_VALID),)
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$(error ERROR: LLVM/clang version too old. Minimum required: $(CLANG_MIN_VER), found: $(CLANG_VER))
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endif
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endif
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endif
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define CompileBPF
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$(CLANG) -g -target $(BPF_ARCH)-linux-gnu $(BPF_CFLAGS) $(BPF_IREMAP_CFLAGS) $(2) \
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-c $(1) -o $(patsubst %.c,%.bc,$(1))
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$(LLVM_OPT) -O2 -mtriple=$(BPF_TARGET) < $(patsubst %.c,%.bc,$(1)) > $(patsubst %.c,%.opt,$(1))
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$(LLVM_DIS) < $(patsubst %.c,%.opt,$(1)) > $(patsubst %.c,%.S,$(1))
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$(LLVM_LLC) -march=$(BPF_TARGET) -mcpu=v3 -filetype=obj -o $(patsubst %.c,%.o,$(1)) < $(patsubst %.c,%.S,$(1))
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$(CP) $(patsubst %.c,%.o,$(1)) $(patsubst %.c,%.debug.o,$(1))
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$(LLVM_STRIP) --strip-debug $(patsubst %.c,%.o,$(1))
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endef
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