Help: Document HIP standard/extensions properties and variables

Help/manual/cmake-properties.7.rst

@@ -215,6 +215,9 @@ Properties on Targets
    /prop_tgt/GNUtoMS
    /prop_tgt/HAS_CXX
    /prop_tgt/HIP_ARCHITECTURES
+   /prop_tgt/HIP_EXTENSIONS
+   /prop_tgt/HIP_STANDARD
+   /prop_tgt/HIP_STANDARD_REQUIRED
    /prop_tgt/IMPLICIT_DEPENDS_INCLUDE_TRANSFORM
    /prop_tgt/IMPORTED
    /prop_tgt/IMPORTED_COMMON_LANGUAGE_RUNTIME

Help/manual/cmake-variables.7.rst

@@ -528,6 +528,9 @@ Variables for Languages
    /variable/CMAKE_Fortran_MODDIR_FLAG
    /variable/CMAKE_Fortran_MODOUT_FLAG
    /variable/CMAKE_HIP_ARCHITECTURES
+   /variable/CMAKE_HIP_EXTENSIONS
+   /variable/CMAKE_HIP_STANDARD
+   /variable/CMAKE_HIP_STANDARD_REQUIRED
    /variable/CMAKE_ISPC_HEADER_DIRECTORY
    /variable/CMAKE_ISPC_HEADER_SUFFIX
    /variable/CMAKE_ISPC_INSTRUCTION_SETS

Help/prop_tgt/HIP_EXTENSIONS.rst

@@ -0,0 +1,19 @@
+HIP_EXTENSIONS
+--------------
+
+.. versionadded:: 3.21
+
+Boolean specifying whether compiler specific extensions are requested.
+
+This property specifies whether compiler specific extensions should be
+used.  For some compilers, this results in adding a flag such
+as ``-std=gnu++11`` instead of ``-std=c++11`` to the compile line.  This
+property is ``ON`` by default. The basic HIP/C++ standard level is
+controlled by the :prop_tgt:`HIP_STANDARD` target property.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.
+
+This property is initialized by the value of
+the :variable:`CMAKE_HIP_EXTENSIONS` variable if it is set when a target
+is created.

Help/prop_tgt/HIP_STANDARD.rst

@@ -0,0 +1,48 @@
+HIP_STANDARD
+------------
+
+.. versionadded:: 3.21
+
+The HIP/C++ standard requested to build this target.
+
+Supported values are:
+
+``98``
+  HIP C++98
+
+``11``
+  HIP C++11
+
+``14``
+  HIP C++14
+
+``17``
+  HIP C++17
+
+``20``
+  HIP C++20
+
+``23``
+  HIP C++23
+
+If the value requested does not result in a compile flag being added for
+the compiler in use, a previous standard flag will be added instead.  This
+means that using:
+
+.. code-block:: cmake
+
+  set_property(TARGET tgt PROPERTY HIP_STANDARD 11)
+
+with a compiler which does not support ``-std=gnu++11`` or an equivalent
+flag will not result in an error or warning, but will instead add the
+``-std=gnu++98`` flag if supported.  This "decay" behavior may be controlled
+with the :prop_tgt:`HIP_STANDARD_REQUIRED` target property.
+Additionally, the :prop_tgt:`HIP_EXTENSIONS` target property may be used to
+control whether compiler-specific extensions are enabled on a per-target basis.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.
+
+This property is initialized by the value of
+the :variable:`CMAKE_HIP_STANDARD` variable if it is set when a target
+is created.

Help/prop_tgt/HIP_STANDARD_REQUIRED.rst

@@ -0,0 +1,19 @@
+HIP_STANDARD_REQUIRED
+---------------------
+
+.. versionadded:: 3.21
+
+Boolean describing whether the value of :prop_tgt:`HIP_STANDARD` is a requirement.
+
+If this property is set to ``ON``, then the value of the
+:prop_tgt:`HIP_STANDARD` target property is treated as a requirement.  If this
+property is ``OFF`` or unset, the :prop_tgt:`HIP_STANDARD` target property is
+treated as optional and may "decay" to a previous standard if the requested is
+not available.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.
+
+This property is initialized by the value of
+the :variable:`CMAKE_HIP_STANDARD_REQUIRED` variable if it is set when a
+target is created.

Help/variable/CMAKE_HIP_EXTENSIONS.rst

@@ -0,0 +1,10 @@
+CMAKE_HIP_EXTENSIONS
+--------------------
+
+.. versionadded:: 3.21
+
+Default value for :prop_tgt:`HIP_EXTENSIONS` target property if set when a
+target is created.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.

Help/variable/CMAKE_HIP_STANDARD.rst

@@ -0,0 +1,10 @@
+CMAKE_HIP_STANDARD
+------------------
+
+.. versionadded:: 3.21
+
+Default value for :prop_tgt:`HIP_STANDARD` target property if set when a target
+is created.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.

Help/variable/CMAKE_HIP_STANDARD_REQUIRED.rst

@@ -0,0 +1,10 @@
+CMAKE_HIP_STANDARD_REQUIRED
+---------------------------
+
+.. versionadded:: 3.21
+
+Default value for :prop_tgt:`HIP_STANDARD_REQUIRED` target property if set when
+a target is created.
+
+See the :manual:`cmake-compile-features(7)` manual for information on
+compile features and a list of supported compilers.