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Makefile: download libbpf submodule when not found #44

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Jul 27, 2021
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Makefile: download libbpf submodule when not found #44

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9 changes: 8 additions & 1 deletion Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ ARCH := $(subst x86_64,amd64,$(ARCH))

BTFFILE = /sys/kernel/btf/vmlinux
BPFTOOL = $(shell which bpftool || /bin/false)
GIT = $(shell which git || /bin/false)
VMLINUXH = $(OUTPUT)/vmlinux.h

# libbpf
Expand Down Expand Up @@ -99,14 +100,20 @@ $(VMLINUXH): $(OUTPUT)

# static libbpf generation for the git submodule

$(LIBBPF_OBJ): $(wildcard $(LIBBPF_SRC)/*.[ch]) | $(OUTPUT)/libbpf
$(LIBBPF_OBJ): $(LIBBPF_SRC) $(wildcard $(LIBBPF_SRC)/*.[ch]) | $(OUTPUT)/libbpf
CC="$(CC)" CFLAGS="$(CFLAGS)" LD_FLAGS="$(LDFLAGS)" \
$(MAKE) -C $(LIBBPF_SRC) \
BUILD_STATIC_ONLY=1 \
OBJDIR=$(LIBBPF_OBJDIR) \
DESTDIR=$(LIBBPF_DESTDIR) \
INCLUDEDIR= LIBDIR= UAPIDIR= install

$(LIBBPF_SRC):
ifeq ($(wildcard $@), )
echo "INFO: updating submodule 'libbpf'"
$(GIT) submodule update --init --recursive
endif

# selftests

SELFTESTS = $(shell find $(SELFTEST) -mindepth 1 -maxdepth 1 -type d ! -name 'common' ! -name 'build')
Expand Down