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tools, bpf: Fix build for 'make -s tools/bpf O=<dir>'

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Building selftests with 'make TARGETS=bpf kselftest' was fixed in commit
55d554f5d1 ("tools: bpf: Use !building_out_of_srctree to determine
srctree"). However, by updating $(srctree) in tools/bpf/Makefile for
in-tree builds only, we leave out the case where we pass an output
directory to build BPF tools, but $(srctree) is not set. This
typically happens for:

    $ make -s tools/bpf O=/tmp/foo
    Makefile:40: /tools/build/Makefile.feature: No such file or directory

Fix it by updating $(srctree) in the Makefile not only for out-of-tree
builds, but also if $(srctree) is empty.

Detected with test_bpftool_build.sh.

Fixes: 55d554f5d1 ("tools: bpf: Use !building_out_of_srctree to determine srctree")
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Link: https://lore.kernel.org/bpf/20191119105626.21453-1-quentin.monnet@netronome.com
This commit is contained in:
Quentin Monnet 2019-11-19 10:56:26 +00:00 committed by Alexei Starovoitov
parent a0f17cc666
commit a89b2cbf71
1 changed files with 6 additions and 0 deletions
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6
tools/bpf/Makefile
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@ -16,7 +16,13 @@ CFLAGS += -D__EXPORTED_HEADERS__ -I$(srctree)/include/uapi -I$(srctree)/include
# isn't set and when invoked from selftests build, where srctree
# is set to ".". building_out_of_srctree is undefined for in srctree
# builds
ifeq ($(srctree),)
update_srctree := 1
endif
ifndef building_out_of_srctree
update_srctree := 1
endif
ifeq ($(update_srctree),1)
srctree := $(patsubst %/,%,$(dir $(CURDIR)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
endif