CMP0092 | |
------- | |
.. versionadded:: 3.15 | |
MSVC warning flags are not in :variable:`CMAKE_<LANG>_FLAGS` by default. | |
When using MSVC-like compilers in CMake 3.14 and below, warning flags | |
like ``/W3`` are added to :variable:`CMAKE_<LANG>_FLAGS` by default. | |
This is problematic for projects that want to choose a different warning | |
level programmatically. In particular, it requires string editing of the | |
:variable:`CMAKE_<LANG>_FLAGS` variables with knowledge of the | |
CMake builtin defaults so they can be replaced. | |
CMake 3.15 and above prefer to leave out warning flags from the value of | |
:variable:`CMAKE_<LANG>_FLAGS` by default. | |
This policy provides compatibility with projects that have not been updated | |
to expect the lack of warning flags. The policy setting takes effect as of | |
the first :command:`project` or :command:`enable_language` command that | |
initializes :variable:`CMAKE_<LANG>_FLAGS` for a given language ``<LANG>``. | |
.. note:: | |
Once the policy has taken effect at the top of a project for a given | |
language, that choice must be used throughout the tree for that language. | |
In projects that have nested projects in subdirectories, be sure to | |
convert everything together. | |
The ``OLD`` behavior for this policy is to place MSVC warning flags in the | |
default :variable:`CMAKE_<LANG>_FLAGS` cache entries. The ``NEW`` behavior | |
for this policy is to *not* place MSVC warning flags in the default cache | |
entries. | |
This policy was introduced in CMake version 3.15. Use the | |
:command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly. | |
Unlike many policies, CMake version |release| does *not* warn | |
when this policy is not set and simply uses ``OLD`` behavior. | |
.. include:: DEPRECATED.txt |