"make O=<dir> tools/gpio" fails:
Makefile:27: /tools/build/Makefile.include: No such file or directory
tools/Makefile clears srctree, and the gpio Makefile only works it out
again when building_out_of_srctree is not set, which the top-level
Makefile sets for O= builds.
Also work out srctree when it is empty, as tools/bpf/Makefile does
since commit a89b2cbf71 ("tools, bpf: Fix build for 'make -s
tools/bpf O=<dir>'").
Fixes: 4a6a6f5c4a ("tools: gpio: Use !building_out_of_srctree to determine srctree")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Signed-off-by: Sasha Levin <sashal@kernel.org>
Link: https://patch.msgid.link/20261011223358.2327625-5-sashal@kernel.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
52336337f1