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docs: Makefile: Inherit PYTHONPYCACHEPREFIX setting as env variable

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Commit 6c2f0b28d7 ("docs: Makefile: store __pycache__ at the output
directory") assigns a new path to PYTHONPYCACHEPREFIX for building
kernel documentation.

However, it is not necessarily optimal for everyone.

If you find PYTHONPYCACHEPREFIX is already set, it strongly suggests
that the developer has selected the setting as best suited for one's own
workflow.

Use "?=" in the assignment to PYTHONPYCACHEPREFIX so that the path of
$(abspath $(BUILDDIR)/__pycache__) works only as a safeguard.

Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <0253ce98-960c-4498-8ace-a4354e3ebc26@gmail.com>
This commit is contained in:
Akira Yokosawa 2025-05-01 17:21:07 +09:00 committed by Jonathan Corbet
parent 40e71e32c8
commit a5b57bd9b1
1 changed files with 3 additions and 1 deletions
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4
Documentation/Makefile
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@ -82,9 +82,11 @@ loop_cmd = $(echo-cmd) $(cmd_$(1)) || exit;
# $5 reST source folder relative to $(src),
# e.g. "userspace-api/media" for the linux-tv book-set at ./Documentation/userspace-api/media
PYTHONPYCACHEPREFIX ?= $(abspath $(BUILDDIR)/__pycache__)
quiet_cmd_sphinx = SPHINX $@ --> file://$(abspath $(BUILDDIR)/$3/$4)
cmd_sphinx = $(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) $(build)=Documentation/userspace-api/media $2 && \
PYTHONPYCACHEPREFIX=$(abspath $(BUILDDIR)/__pycache__) \
PYTHONPYCACHEPREFIX="$(PYTHONPYCACHEPREFIX)" \
BUILDDIR=$(abspath $(BUILDDIR)) SPHINX_CONF=$(abspath $(src)/$5/$(SPHINX_CONF)) \
$(PYTHON3) $(srctree)/scripts/jobserver-exec \
$(CONFIG_SHELL) $(srctree)/Documentation/sphinx/parallel-wrapper.sh \