You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
72 lines
2.6 KiB
72 lines
2.6 KiB
CMP0128
|
|
-------
|
|
|
|
.. versionadded:: 3.22
|
|
|
|
When this policy is set to ``NEW``:
|
|
|
|
* :prop_tgt:`<LANG>_EXTENSIONS` is initialized to
|
|
:variable:`CMAKE_<LANG>_EXTENSIONS` if set, otherwise falling back to
|
|
:variable:`CMAKE_<LANG>_EXTENSIONS_DEFAULT`.
|
|
|
|
* Extensions are correctly enabled/disabled if :prop_tgt:`<LANG>_STANDARD` is
|
|
unset or satisfied by the default.
|
|
|
|
* Standard mode-affecting flags aren't added unless necessary to achieve the
|
|
specified mode.
|
|
|
|
The ``OLD`` behavior:
|
|
|
|
* Initializes :prop_tgt:`<LANG>_EXTENSIONS` to
|
|
:variable:`CMAKE_<LANG>_EXTENSIONS` if set, otherwise falling back to ``ON``.
|
|
|
|
* Always adds a flag if :prop_tgt:`<LANG>_STANDARD` is set and
|
|
:prop_tgt:`<LANG>_STANDARD_REQUIRED` is ``OFF``.
|
|
|
|
* If :prop_tgt:`<LANG>_STANDARD` is unset:
|
|
|
|
* Doesn't disable extensions even if :prop_tgt:`<LANG>_EXTENSIONS` is
|
|
``OFF``.
|
|
|
|
* Fails to enable extensions if :prop_tgt:`<LANG>_EXTENSIONS` is ``ON``
|
|
except for the ``IAR`` compiler.
|
|
|
|
Code may need to be updated for the ``NEW`` behavior in the following cases:
|
|
|
|
* If a standard mode flag previously overridden by CMake's and not used during
|
|
compiler detection now takes effect due to CMake no longer adding one as the
|
|
default detected is appropriate.
|
|
|
|
Such code should be converted to either:
|
|
|
|
* Use :prop_tgt:`<LANG>_STANDARD` and :prop_tgt:`<LANG>_EXTENSIONS` instead
|
|
of manually adding flags.
|
|
|
|
* Or ensure the manually-specified flags are used during compiler detection.
|
|
|
|
* If extensions were disabled without :prop_tgt:`<LANG>_STANDARD` being set
|
|
CMake previously wouldn't actually disable extensions.
|
|
|
|
Such code should be updated to not disable extensions if they are required.
|
|
|
|
* If extensions were enabled/disabled when :prop_tgt:`<LANG>_STANDARD` was
|
|
satisfied by the compiler's default CMake previously wouldn't actually
|
|
enable/disable extensions.
|
|
|
|
Such code should be updated to set the correct extensions mode.
|
|
|
|
If compiler flags affecting the standard mode are used during compiler
|
|
detection (for example in :manual:`a toolchain file <cmake-toolchains(7)>`
|
|
using :variable:`CMAKE_<LANG>_FLAGS_INIT`) then they will affect the detected
|
|
default :variable:`standard <CMAKE_<LANG>_STANDARD_DEFAULT>` and
|
|
:variable:`extensions <CMAKE_<LANG>_EXTENSIONS_DEFAULT>`.
|
|
|
|
Unlike many policies, CMake version |release| does *not* warn when the policy
|
|
is not set and simply uses the ``OLD`` behavior. Use the
|
|
:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly.
|
|
See documentation of the
|
|
:variable:`CMAKE_POLICY_WARNING_CMP0128 <CMAKE_POLICY_WARNING_CMP<NNNN>>`
|
|
variable to control the warning.
|
|
|
|
.. include:: DEPRECATED.txt
|