Makefile

  1# SPDX-License-Identifier: GPL-2.0-only
  2include ../../scripts/Makefile.include
  3include ../../scripts/Makefile.arch
  4
  5srctree := $(abspath $(CURDIR)/../../../)
  6
  7ifeq ($(V),1)
  8  msg =
  9else
 10  ifeq ($(silent),1)
 11    msg =
 12  else
 13    msg = @printf '  %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
 14  endif
 15  MAKEFLAGS=--no-print-directory
 16endif
 17
 18# Overrides for the prepare step libraries.
 19HOST_OVERRIDES := AR="$(HOSTAR)" CC="$(HOSTCC)" LD="$(HOSTLD)" ARCH="$(HOSTARCH)" \
 20		  CROSS_COMPILE="" CLANG_CROSS_FLAGS="" EXTRA_CFLAGS="$(HOSTCFLAGS)"
 21
 22RM      ?= rm
 23HOSTCC  ?= gcc
 24HOSTLD  ?= ld
 25HOSTAR  ?= ar
 26CROSS_COMPILE =
 27
 28OUTPUT ?= $(srctree)/tools/bpf/resolve_btfids/
 29
 30LIBBPF_SRC := $(srctree)/tools/lib/bpf/
 31SUBCMD_SRC := $(srctree)/tools/lib/subcmd/
 32
 33BPFOBJ     := $(OUTPUT)/libbpf/libbpf.a
 34LIBBPF_OUT := $(abspath $(dir $(BPFOBJ)))/
 35SUBCMDOBJ  := $(OUTPUT)/libsubcmd/libsubcmd.a
 36SUBCMD_OUT := $(abspath $(dir $(SUBCMDOBJ)))/
 37
 38LIBBPF_DESTDIR := $(LIBBPF_OUT)
 39LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)include
 40
 41SUBCMD_DESTDIR := $(SUBCMD_OUT)
 42SUBCMD_INCLUDE := $(SUBCMD_DESTDIR)include
 43
 44BINARY     := $(OUTPUT)/resolve_btfids
 45BINARY_IN  := $(BINARY)-in.o
 46
 47all: $(BINARY)
 48
 49prepare: $(BPFOBJ) $(SUBCMDOBJ)
 50
 51$(OUTPUT) $(OUTPUT)/libsubcmd $(LIBBPF_OUT):
 52	$(call msg,MKDIR,,$@)
 53	$(Q)mkdir -p $(@)
 54
 55$(SUBCMDOBJ): fixdep FORCE | $(OUTPUT)/libsubcmd
 56	$(Q)$(MAKE) -C $(SUBCMD_SRC) OUTPUT=$(SUBCMD_OUT) \
 57		    DESTDIR=$(SUBCMD_DESTDIR) $(HOST_OVERRIDES) prefix= subdir= \
 58		    $(abspath $@) install_headers
 59
 60$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUT)
 61	$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) OUTPUT=$(LIBBPF_OUT)    \
 62		    DESTDIR=$(LIBBPF_DESTDIR) $(HOST_OVERRIDES) prefix= subdir= \
 63		    $(abspath $@) install_headers
 64
 65LIBELF_FLAGS := $(shell $(HOSTPKG_CONFIG) libelf --cflags 2>/dev/null)
 66LIBELF_LIBS  := $(shell $(HOSTPKG_CONFIG) libelf --libs 2>/dev/null || echo -lelf)
 67
 68HOSTCFLAGS_resolve_btfids += -g \
 69          -I$(srctree)/tools/include \
 70          -I$(srctree)/tools/include/uapi \
 71          -I$(LIBBPF_INCLUDE) \
 72          -I$(SUBCMD_INCLUDE) \
 73          $(LIBELF_FLAGS)
 74
 75LIBS = $(LIBELF_LIBS) -lz
 76
 77export srctree OUTPUT HOSTCFLAGS_resolve_btfids Q HOSTCC HOSTLD HOSTAR
 78include $(srctree)/tools/build/Makefile.include
 79
 80$(BINARY_IN): fixdep FORCE prepare | $(OUTPUT)
 81	$(Q)$(MAKE) $(build)=resolve_btfids
 82
 83$(BINARY): $(BPFOBJ) $(SUBCMDOBJ) $(BINARY_IN)
 84	$(call msg,LINK,$@)
 85	$(Q)$(HOSTCC) $(BINARY_IN) $(KBUILD_HOSTLDFLAGS) -o $@ $(BPFOBJ) $(SUBCMDOBJ) $(LIBS)
 86
 87clean_objects := $(wildcard $(OUTPUT)/*.o                \
 88                            $(OUTPUT)/.*.o.cmd           \
 89                            $(OUTPUT)/.*.o.d             \
 90                            $(LIBBPF_OUT)                \
 91                            $(LIBBPF_DESTDIR)            \
 92                            $(SUBCMD_OUT)                \
 93                            $(SUBCMD_DESTDIR)            \
 94                            $(OUTPUT)/resolve_btfids)
 95
 96ifneq ($(clean_objects),)
 97clean: fixdep-clean
 98	$(call msg,CLEAN,$(BINARY))
 99	$(Q)$(RM) -rf $(clean_objects)
100else
101clean:
102endif
103
104tags:
105	$(call msg,GEN,,tags)
106	$(Q)ctags -R . $(LIBBPF_SRC) $(SUBCMD_SRC)
107
108FORCE:
109
110.PHONY: all FORCE clean tags prepare