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docs: conf.py: bump minimum Sphinx version requirement
extlinks captions support using %s substitution but only from sphinx 4.0 onwards. Anything before does not support the %s substitution. However, this will be a requirement in sphinx 6.0 and later, and sphinx 5.0 already shows a warning telling us that. Since the build is made with -W flag which fails it if any warning is printed, a fix is required. Sphinx 4.0.0 was released two years ago. Unfortunately, Debian packages are out-of-date and only the latest Ubuntu has recent enough packages. Therefore, pip installation should be recommended now instead and the minimum version for building the docs bumped to 4.0. Cc: Quentin Schulz <foss+yocto@0leil.net> (From yocto-docs rev: ab45a7a40484a2d8e604cb45549037c526ec61cb) Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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@ -53,7 +53,7 @@ author = 'The Linux Foundation'
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# -- General configuration ---------------------------------------------------
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# Prevent building with an outdated version of sphinx
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needs_sphinx = "3.1"
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needs_sphinx = "4.0"
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# to load local extension from the folder 'sphinx'
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sys.path.insert(0, os.path.abspath('sphinx'))
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