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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/Documentation/sphinx/load_config.py
..
..
@@ -21,6 +21,29 @@
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         and os.path.normpath(namespace["__file__"]) != os.path.normpath(config_file) ):
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         config_file = os.path.abspath(config_file)
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+        # Let's avoid one conf.py file just due to latex_documents
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+        start = config_file.find('Documentation/')
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+        if start >= 0:
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+            start = config_file.find('/', start + 1)
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+
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+        end = config_file.rfind('/')
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+        if start >= 0 and end > 0:
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+            dir = config_file[start + 1:end]
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+
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+            print("source directory: %s" % dir)
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+            new_latex_docs = []
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+            latex_documents = namespace['latex_documents']
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+
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+            for l in latex_documents:
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+                if l[0].find(dir + '/') == 0:
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+                    has = True
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+                    fn = l[0][len(dir) + 1:]
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+                    new_latex_docs.append((fn, l[1], l[2], l[3], l[4]))
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+                    break
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+
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+            namespace['latex_documents'] = new_latex_docs
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+
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+        # If there is an extra conf.py file, load it
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         if os.path.isfile(config_file):
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             sys.stdout.write("load additional sphinx-config: %s\n" % config_file)
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             config = namespace.copy()
..
..
@@ -29,4 +52,6 @@
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             del config['__file__']
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             namespace.update(config)
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         else:
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-            sys.stderr.write("WARNING: additional sphinx-config not found: %s\n" % config_file)
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+            config = namespace.copy()
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+            config['tags'].add("subproject")
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+            namespace.update(config)