cmake_command: Add command to INVOKE other commands by name

Fixes: #18392

Help/command/cmake_command.rst

@@ -0,0 +1,40 @@
+cmake_command
+-------------
+
+Call meta-operations on CMake commands.
+
+Synopsis
+^^^^^^^^
+
+.. parsed-literal::
+
+  cmake_command(`INVOKE`_ <command> [<args>...])
+
+Introduction
+^^^^^^^^^^^^
+
+This command will call meta-operations on built-in CMake commands or
+those created via the :command:`macro` or :command:`function` commands.
+
+Invoking
+^^^^^^^^
+
+.. _INVOKE:
+
+.. code-block:: cmake
+
+  cmake_command(INVOKE <command> [<args>...])
+
+Invokes the named ``<command>`` with the given arguments (if any).
+For example, the code:
+
+.. code-block:: cmake
+
+  set(message_command "message")
+  cmake_command(INVOKE ${message_command} STATUS "Hello World!")
+
+is equivalent to
+
+.. code-block:: cmake
+
+  message(STATUS "Hello World!")

Help/command/function.rst

@@ -44,11 +44,15 @@ can be invoked through any of
   foo()
   Foo()
   FOO()
+  cmake_command(INVOKE foo)
 
 and so on. However, it is strongly recommended to stay with the
 case chosen in the function definition. Typically functions use
 all-lowercase names.
 
+The :command:`cmake_command(INVOKE ...)` command can also be used to invoke the
+function.
+
 Arguments
 ^^^^^^^^^
 

Help/command/macro.rst

@@ -42,11 +42,15 @@ can be invoked through any of
   foo()
   Foo()
   FOO()
+  cmake_command(INVOKE foo)
 
 and so on. However, it is strongly recommended to stay with the
 case chosen in the macro definition.  Typically macros use
 all-lowercase names.
 
+The :command:`cmake_command(INVOKE ...)` command can also be used to invoke the
+macro.
+
 Arguments
 ^^^^^^^^^
 

Help/manual/cmake-commands.7.rst

@@ -16,6 +16,7 @@ These commands are always available.
    :maxdepth: 1
 
    /command/break
+   /command/cmake_command
    /command/cmake_host_system_information
    /command/cmake_minimum_required
    /command/cmake_parse_arguments

Help/release/dev/cmake_command-command.rst

@@ -0,0 +1,6 @@
+cmake_command
+-------------
+
+* The :command:`cmake_command()` command was added for meta-operations on
+  scripted or built-in commands, starting with a mode to ``INVOKE`` other
+  commands.