Makefile.btfgen

# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
SOURCE_BTF_FILES = $(shell find $(BTFHUB_ARCHIVE)/ -iregex ".*$(subst x86,x86_64,$(ARCH)).*" -type f -name '*.btf.tar.xz')
MIN_CORE_BTF_FILES = $(patsubst $(BTFHUB_ARCHIVE)/%.btf.tar.xz, $(OUTPUT)/min_core_btfs/%.btf, $(SOURCE_BTF_FILES))
BPF_O_FILES = $(patsubst %,$(OUTPUT)/%.bpf.o,$(APPS))

.PHONY: all
all: $(OUTPUT)/min_core_btf_tar.o

ifeq ($(V),1)
Q =
msg =
else
Q = @
msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
MAKEFLAGS += --no-print-directory
endif

$(BTFHUB_ARCHIVE)/%.btf: $(BTFHUB_ARCHIVE)/%.btf.tar.xz
	$(call msg,UNTAR,$@)
	$(Q)tar xvfJ $< -C "$(@D)" > /dev/null
	$(Q)touch $@

$(MIN_CORE_BTF_FILES): $(BPF_O_FILES)

# Create reduced version of BTF files to be embedded within the tools executables
$(OUTPUT)/min_core_btfs/%.btf: $(BTFHUB_ARCHIVE)/%.btf
	$(call msg,BTFGEN,$@)
	$(Q)mkdir -p "$(@D)"
	$(Q)$(BPFTOOL) gen min_core_btf $< $@ $(OUTPUT)/*.bpf.o

# Compress reduced BTF files and create an object file with its content
$(OUTPUT)/min_core_btf_tar.o: $(MIN_CORE_BTF_FILES)
	$(call msg,TAR,$@)
	$(Q)tar c --gz -f $(OUTPUT)/min_core_btfs.tar.gz -C $(OUTPUT)/min_core_btfs/ .
	$(Q)cd $(OUTPUT) && ld -r -b binary min_core_btfs.tar.gz -o $@

# delete failed targets
.DELETE_ON_ERROR:
# keep intermediate (.skel.h, .bpf.o, etc) targets
.SECONDARY: