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diff --git a/Modules/CheckCompilerFlag.cmake b/Modules/CheckCompilerFlag.cmake
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+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+CheckCompilerFlag
+---------------------
+
+.. versionadded:: 3.19
+
+Check whether the compiler supports a given flag.
+
+.. command:: check_compiler_flag
+
+  .. code-block:: cmake
+
+    check_compiler_flag(<lang> <flag> <var>)
+
+Check that the ``<flag>`` is accepted by the compiler without a diagnostic.
+Stores the result in an internal cache entry named ``<var>``.
+
+This command temporarily sets the ``CMAKE_REQUIRED_DEFINITIONS`` variable
+and calls the ``check_source_compiles(<LANG>)`` function from the
+:module:`CheckSourceCompiles` module.  See documentation of that
+module for a listing of variables that can otherwise modify the build.
+
+A positive result from this check indicates only that the compiler did not
+issue a diagnostic message when given the flag.  Whether the flag has any
+effect or even a specific one is beyond the scope of this module.
+
+.. note::
+  Since the :command:`try_compile` command forwards flags from variables
+  like :variable:`CMAKE_<LANG>_FLAGS <CMAKE_<LANG>_FLAGS>`, unknown flags
+  in such variables may cause a false negative for this check.
+#]=======================================================================]
+
+include_guard(GLOBAL)
+include(Internal/CheckCompilerFlag)
+
+function(CHECK_COMPILER_FLAG _lang _flag _var)
+  cmake_check_compiler_flag(${_lang} "${_flag}" ${_var})
+endfunction()