Makefile

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)

LLC ?= llc
CLANG ?= clang
CC := gcc
OUT ?= .
SRC ?= src

SOURCES ?= $(wildcard $(SRC)/*.c)
OBJECTS := $(patsubst $(SRC)/%.c, $(OUT)/%.o, $(SOURCES))

CFLAGS ?= -Iinclude/

LIBS = -lbpf -lelf

all: llvm-check $(OBJECTS)

.PHONY: clean $(CLANG) $(LLC)

clean:
	rm -f $(OBJECTS)
	rm -f *.ll
	rm -f *~

llvm-check: $(CLANG) $(LLC)
	@for TOOL in $^ ; do \
		if [ ! $$(command -v $${TOOL} 2>/dev/null) ]; then \
			echo "*** ERROR: Cannot find tool $${TOOL}" ;\
			exit 1; \
		else true; fi; \
	done

$(OUT)/%.o: $(SRC)/%.c
	$(CLANG) -S \
	    -D __BPF_TRACING__ \
	    $(CFLAGS) \
	    -Wall \
	    -Winline \
	    -Wno-unused-value \
	    -Wno-pointer-sign \
	    -Wno-compare-distinct-pointer-types \
	    -Werror \
	    -target bpf \
	    -O2 -emit-llvm -c -g -o ${@:.o=.ll} $<
	$(LLC) -march=bpf -filetype=obj -o $@ ${@:.o=.ll}