doc: fix sphinx compatibility
The function add_stylesheet() is deprecated since sphinx 1.8. It will be removed in sphinx 4.0. It is replaced by add_css_file(). Cc: stable@dpdk.org Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
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@ -415,4 +415,8 @@ def setup(app):
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# Process the numref references once the doctree has been created.
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app.connect('doctree-resolved', process_numref)
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app.add_stylesheet('css/custom.css')
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try:
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# New function in sphinx 1.8
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app.add_css_file('css/custom.css')
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except:
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app.add_stylesheet('css/custom.css')
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