[Documentation] Replace recommonmark by myst-parser (#65664)

Recommonmark has been deprecated, then archived last year. This was
tracked by: https://github.com/llvm/llvm-iwg/issues/30

See https://github.com/readthedocs/recommonmark

This patch migrates all our doc to use myst

Additional details for bot maintainers: https://discourse.llvm.org/t/maintenance-required-on-sphinx-build-bots/73612

1 files changed, 3 insertions, 20 deletions

diff --git a/llvm/docs/conf.py b/llvm/docs/conf.py
index 206f72285..cf8a759 100644
--- a/llvm/docs/conf.py
+++ b/llvm/docs/conf.py
@@ -26,31 +26,14 @@ from datetime import date
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ["sphinx.ext.intersphinx", "sphinx.ext.todo"]
+extensions = ["myst_parser", "sphinx.ext.intersphinx", "sphinx.ext.todo"]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["_templates"]
 
-# The suffix of source filenames.
-source_suffix = {
-    ".rst": "restructuredtext",
-}
+source_suffix = [".rst", ".md"]
 
-try:
-    import recommonmark
-except ImportError:
-    # manpages do not use any .md sources
-    if not tags.has("builder-man"):
-        raise
-else:
-    import sphinx
-
-    if sphinx.version_info >= (3, 0):
-        # This requires 0.5 or later.
-        extensions.append("recommonmark")
-    else:
-        source_parsers = {".md": "recommonmark.parser.CommonMarkParser"}
-    source_suffix[".md"] = "markdown"
+import sphinx
 
 # The encoding of source files.
 # source_encoding = 'utf-8-sig'