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Shuah Khan 55d554f5d1 tools: bpf: Use !building_out_of_srctree to determine srctree

make TARGETS=bpf kselftest fails with:

Makefile:127: tools/build/Makefile.include: No such file or directory

When the bpf tool make is invoked from tools Makefile, srctree is
cleared and the current logic check for srctree equals to empty
string to determine srctree location from CURDIR.

When the build in invoked from selftests/bpf Makefile, the srctree
is set to "." and the same logic used for srctree equals to empty is
needed to determine srctree.

Check building_out_of_srctree undefined as the condition for both
cases to fix "make TARGETS=bpf kselftest" build failure.

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20190927011344.4695-1-skhan@linuxfoundation.org

2019-09-30 10:53:34 +02:00

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SPDX-License-Identifier: GPL-2.0

include ../scripts/Makefile.include

prefix ?= /usr/local

CC = gcc LEX = flex YACC = bison MAKE = make INSTALL ?= install

CFLAGS += -Wall -O2 CFLAGS += -D__EXPORTED_HEADERS__ -I$(srctree)/include/uapi -I$(srctree)/include

This will work when bpf is built in tools env. where srctree

isn't set and when invoked from selftests build, where srctree

is set to ".". building_out_of_srctree is undefined for in srctree

builds

ifndef building_out_of_srctree srctree := $(patsubst %/,%,$(dir $(CURDIR))) srctree := $(patsubst %/,%,$(dir $(srctree))) endif

ifeq ($(V),1) Q = else Q = @ endif

FEATURE_USER = .bpf FEATURE_TESTS = libbfd disassembler-four-args FEATURE_DISPLAY = libbfd disassembler-four-args

check_feat := 1 NON_CHECK_FEAT_TARGETS := clean bpftool_clean ifdef MAKECMDGOALS ifeq ($(filter-out $(NON_CHECK_FEAT_TARGETS),$(MAKECMDGOALS)),) check_feat := 0 endif endif

ifeq ($(check_feat),1) ifeq ($(FEATURES_DUMP),) include $(srctree)/tools/build/Makefile.feature else include $(FEATURES_DUMP) endif endif

ifeq ($(feature-disassembler-four-args), 1) CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE endif

$(OUTPUT)%.yacc.c: $(srctree)/tools/bpf/%.y $(QUIET_BISON)$(YACC) -o $@ -d $<

$(OUTPUT)%.lex.c: $(srctree)/tools/bpf/%.l $(QUIET_FLEX)$(LEX) -o $@ $<

$(OUTPUT)%.o: $(srctree)/tools/bpf/%.c $(QUIET_CC)$(COMPILE.c) -o $@ $<

$(OUTPUT)%.yacc.o: $(OUTPUT)%.yacc.c $(QUIET_CC)$(COMPILE.c) -o $@ $< $(OUTPUT)%.lex.o: $(OUTPUT)%.lex.c $(QUIET_CC)$(COMPILE.c) -o $@ $<

PROGS = $(OUTPUT)bpf_jit_disasm $(OUTPUT)bpf_dbg $(OUTPUT)bpf_asm

all: $(PROGS) bpftool

$(OUTPUT)bpf_jit_disasm: CFLAGS += -DPACKAGE='bpf_jit_disasm' $(OUTPUT)bpf_jit_disasm: $(OUTPUT)bpf_jit_disasm.o $(QUIET_LINK)$(CC) $(CFLAGS) -o $@ $^ -lopcodes -lbfd -ldl

$(OUTPUT)bpf_dbg: $(OUTPUT)bpf_dbg.o $(QUIET_LINK)$(CC) $(CFLAGS) -o $@ $^ -lreadline

$(OUTPUT)bpf_asm: $(OUTPUT)bpf_asm.o $(OUTPUT)bpf_exp.yacc.o $(OUTPUT)bpf_exp.lex.o $(QUIET_LINK)$(CC) $(CFLAGS) -o $@ $^

$(OUTPUT)bpf_exp.lex.c: $(OUTPUT)bpf_exp.yacc.c $(OUTPUT)bpf_exp.yacc.o: $(OUTPUT)bpf_exp.yacc.c $(OUTPUT)bpf_exp.lex.o: $(OUTPUT)bpf_exp.lex.c

clean: bpftool_clean $(call QUIET_CLEAN, bpf-progs) $(Q)$(RM) -r -- $(OUTPUT).o $(OUTPUT)bpf_jit_disasm $(OUTPUT)bpf_dbg
$(OUTPUT)bpf_asm $(OUTPUT)bpf_exp.yacc. $(OUTPUT)bpf_exp.lex.* $(call QUIET_CLEAN, core-gen) $(Q)$(RM) -- $(OUTPUT)FEATURE-DUMP.bpf $(Q)$(RM) -r -- $(OUTPUT)feature

install: $(PROGS) bpftool_install $(call QUIET_INSTALL, bpf_jit_disasm) $(Q)$(INSTALL) -m 0755 -d $(DESTDIR)$(prefix)/bin $(Q)$(INSTALL) $(OUTPUT)bpf_jit_disasm $(DESTDIR)$(prefix)/bin/bpf_jit_disasm $(call QUIET_INSTALL, bpf_dbg) $(Q)$(INSTALL) $(OUTPUT)bpf_dbg $(DESTDIR)$(prefix)/bin/bpf_dbg $(call QUIET_INSTALL, bpf_asm) $(Q)$(INSTALL) $(OUTPUT)bpf_asm $(DESTDIR)$(prefix)/bin/bpf_asm

bpftool: $(call descend,bpftool)

bpftool_install: $(call descend,bpftool,install)

bpftool_clean: $(call descend,bpftool,clean)

.PHONY: all install clean bpftool bpftool_install bpftool_clean

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