The default recursion limit is not good enough to handle
complex books. I'm sometimes receiving this error message:

        sphinx.errors.SphinxParallelError: RecursionError: maximum recursion 
depth exceeded while pickling an object

or those:

        maximum recursion depth exceeded while calling a Python object
        This can happen with very large or deeply nested source files.  You can 
carefully increase the default Python recursion limit of 1000 in conf.py with 
e.g.:
            import sys; sys.setrecursionlimit(1500)

Increase it.

Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
---
 Documentation/conf.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/conf.py b/Documentation/conf.py
index 45a0741b39ed..ff5a5979f5d5 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -19,6 +19,7 @@ import sphinx
 # Get Sphinx version
 major, minor, patch = sphinx.version_info[:3]
 
+sys.setrecursionlimit(5000)
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
-- 
2.9.3

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