jit,docs: use enum directive for enumeral types

gcc/jit/ChangeLog:

	* docs/conf.py: Add needs_sphinx = '3.0' where c:type was added.
	* docs/index.rst: Remove note about it.
	* docs/topics/compilation.rst: Use enum directive and reference.
	* docs/topics/contexts.rst: Likewise.
	* docs/topics/expressions.rst: Likewise.
	* docs/topics/functions.rst: Likewise.

6 files changed, 14 insertions, 18 deletions

diff --git a/gcc/jit/docs/conf.py b/gcc/jit/docs/conf.py
index 00f0e98..062232a 100644
--- a/gcc/jit/docs/conf.py
+++ b/gcc/jit/docs/conf.py
@@ -39,6 +39,9 @@ source_suffix = '.rst'
 # The master toctree document.
 master_doc = 'index'
 
+# c:type directive is supported since 3.0
+needs_sphinx = '3.0'
+
 # General information about the project.
 project = u'libgccjit'
 copyright = u'2014-2022 Free Software Foundation, Inc.'
diff --git a/gcc/jit/docs/index.rst b/gcc/jit/docs/index.rst
index 3aff17d..21c3140 100644
--- a/gcc/jit/docs/index.rst
+++ b/gcc/jit/docs/index.rst
@@ -45,10 +45,3 @@ Indices and tables
 * :ref:`genindex`
 * :ref:`modindex`
 * :ref:`search`
-
-.. Some notes:
-
-   The Sphinx C domain appears to lack explicit support for enum values,
-   so I've been using :c:macro: for them.
-
-   See https://sphinx-doc.org/domains.html#the-c-domain
diff --git a/gcc/jit/docs/topics/compilation.rst b/gcc/jit/docs/topics/compilation.rst
index 9b1eed2..c5fa6eb 100644
--- a/gcc/jit/docs/topics/compilation.rst
+++ b/gcc/jit/docs/topics/compilation.rst
@@ -158,14 +158,14 @@ For linking in object files, use :c:func:`gcc_jit_context_add_driver_option`.
 
 :c:func:`gcc_jit_context_compile_to_file` ignores the suffix of
 ``output_path``, and insteads uses the given
-:c:type:`enum gcc_jit_output_kind` to decide what to do.
+:c:enum:`gcc_jit_output_kind` to decide what to do.
 
 .. note::
 
    This is different from the ``gcc`` program, which does make use of the
    suffix of the output file when determining what to do.
 
-.. type:: enum gcc_jit_output_kind
+.. enum:: gcc_jit_output_kind
 
 The available kinds of output are:
 
diff --git a/gcc/jit/docs/topics/contexts.rst b/gcc/jit/docs/topics/contexts.rst
index dfbe968..205b5f3 100644
--- a/gcc/jit/docs/topics/contexts.rst
+++ b/gcc/jit/docs/topics/contexts.rst
@@ -311,7 +311,7 @@ String Options
 
    Set a string option of the context.
 
-   .. type:: enum gcc_jit_str_option
+   .. enum:: gcc_jit_str_option
 
    The parameter ``value`` can be NULL.   If non-NULL, the call takes a
    copy of the underlying string, so it is valid to pass in a pointer to
@@ -334,7 +334,7 @@ Boolean options
   Set a boolean option of the context.
   Zero is "false" (the default), non-zero is "true".
 
-  .. type:: enum gcc_jit_bool_option
+  .. enum:: gcc_jit_bool_option
 
   .. macro:: GCC_JIT_BOOL_OPTION_DEBUGINFO
 
@@ -513,7 +513,7 @@ Integer options
 
   Set an integer option of the context.
 
-  .. type:: enum gcc_jit_int_option
+  .. enum:: gcc_jit_int_option
 
   There is just one integer option specified this way:
 
diff --git a/gcc/jit/docs/topics/expressions.rst b/gcc/jit/docs/topics/expressions.rst
index 91ee8a9..49b7e14 100644
--- a/gcc/jit/docs/topics/expressions.rst
+++ b/gcc/jit/docs/topics/expressions.rst
@@ -309,7 +309,7 @@ Unary Operations
 
    The parameter ``result_type`` must be a numeric type.
 
-.. type:: enum gcc_jit_unary_op
+.. enum:: gcc_jit_unary_op
 
 The available unary operations are:
 
@@ -376,7 +376,7 @@ Binary Operations
 
    The parameter ``result_type`` must be a numeric type.
 
-.. type:: enum gcc_jit_binary_op
+.. enum:: gcc_jit_binary_op
 
 The available binary operations are:
 
@@ -534,7 +534,7 @@ Comparisons
 
    Build a boolean rvalue out of the comparison of two other rvalues.
 
-.. type:: enum gcc_jit_comparison
+.. enum:: gcc_jit_comparison
 
 =======================================  ============
 Comparison                               C equivalent
@@ -711,7 +711,7 @@ where the rvalue is computed by reading from the storage area.
 
    The "model" parameter determines the thread-local storage model of the "lvalue":
 
-   .. type:: enum gcc_jit_tls_model
+   .. enum:: gcc_jit_tls_model
 
    .. c:macro:: GCC_JIT_TLS_MODEL_NONE
 
@@ -841,7 +841,7 @@ Global variables
    The "kind" parameter determines the visibility of the "global" outside
    of the :c:type:`gcc_jit_result`:
 
-   .. type:: enum gcc_jit_global_kind
+   .. enum:: gcc_jit_global_kind
 
    .. c:macro:: GCC_JIT_GLOBAL_EXPORTED
 
diff --git a/gcc/jit/docs/topics/functions.rst b/gcc/jit/docs/topics/functions.rst
index 0845fe0..d6d4fe9 100644
--- a/gcc/jit/docs/topics/functions.rst
+++ b/gcc/jit/docs/topics/functions.rst
@@ -80,7 +80,7 @@ Functions
 
    Create a gcc_jit_function with the given name and parameters.
 
-   .. type:: enum gcc_jit_function_kind
+   .. enum:: gcc_jit_function_kind
 
    This enum controls the kind of function created, and has the following
    values: