test: set default C and C++ language standards to use

Define the language standard to use while testing. Use c17 and c++17,
fairly arbitrarily. We can remove the std option from template.yaml.

Note that the parser selects the -x language option based on domain and
filename suffix.

test/conf.py

@@ -29,6 +29,11 @@
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = None
 
+# -- Options for Hawkmoth ----------------------------------------------------
+# https://jnikula.github.io/hawkmoth/dev/extension.html#configuration
+
+hawkmoth_clang_c = ['-std=c17']
+hawkmoth_clang_cpp = ['-std=c++17']
 
 # -- Options for HTML output -------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output

test/cpp/template.yaml

@@ -3,7 +3,4 @@ directives:
   directive: autodoc
   arguments:
   - template.cpp
-  options:
-    clang:
-    - --std=c++17
 expected: template.rst