Generate PDF instead of HTML Sphinx documentation.

See https://bugzilla.redhat.com/show_bug.cgi?id=2006555 for discussion.

python-pyrsistent.spec

@@ -1,3 +1,9 @@
+# Sphinx-generated HTML documentation is not suitable for packaging; see
+# https://bugzilla.redhat.com/show_bug.cgi?id=2006555 for discussion.
+#
+# We can generate PDF documentation as a lesser substitute.
+%bcond_without doc_pdf
+
 Name:           python-pyrsistent
 Summary:        Persistent/Functional/Immutable data structures
 Version:        0.18.0
@@ -16,7 +22,11 @@ BuildRequires:  python3-devel
 BuildRequires:  gcc
 
 # For Sphinx documentation
+%if %{with doc_pdf}
 BuildRequires:  make
+BuildRequires:  python3-sphinx-latex
+BuildRequires:  latexmk
+%endif
 
 # We need manual BR’s since they are generally not available where
 # %%pyproject_buildrequires can access them, i.e., outside requirements.txt,
@@ -112,8 +122,10 @@ BuildArch:      noarch
 # Default SPHINXOPTS are '-W -n', but -W turns warnings into errors and there
 # are some warnings. We want to build the documentation as best we can anyway.
 # Additionally, we parallelize sphinx-build.
-%make_build -C docs html SPHINXOPTS='-n %{?_smp_mflags}'
-rm -f docs/build/html/.buildinfo
+%if %{with doc_pdf}
+PYTHONPATH="${PWD}" %make_build -C docs latex SPHINXOPTS='-n %{?_smp_mflags}'
+%make_build -C docs/build/latex
+%endif
 
 
 %install
@@ -134,7 +146,9 @@ env PYTHONHASHSEED=0 %pytest --doctest-modules pyrsistent
 %license LICENSE.mit
 %doc CHANGES.txt
 %doc README.rst
-%doc docs/build/html
+%if %{with doc_pdf}
+%doc docs/build/latex/Pyrsistent.pdf
+%endif
 
 
 %changelog