mirror of
https://github.com/Detanup01/gbe_fork.git
synced 2024-11-28 13:44:02 +08:00
129 lines
4.8 KiB
ReStructuredText
129 lines
4.8 KiB
ReStructuredText
set
|
|
---
|
|
|
|
Set a normal, cache, or environment variable to a given value.
|
|
See the :ref:`cmake-language(7) variables <CMake Language Variables>`
|
|
documentation for the scopes and interaction of normal variables
|
|
and cache entries.
|
|
|
|
Signatures of this command that specify a ``<value>...`` placeholder
|
|
expect zero or more arguments. Multiple arguments will be joined as
|
|
a :ref:`semicolon-separated list <CMake Language Lists>` to form the
|
|
actual variable value to be set.
|
|
|
|
Set Normal Variable
|
|
^^^^^^^^^^^^^^^^^^^
|
|
|
|
.. signature::
|
|
set(<variable> <value>... [PARENT_SCOPE])
|
|
:target: normal
|
|
|
|
Set or unset ``<variable>`` in the current function or directory scope:
|
|
|
|
* If at least one ``<value>...`` is given, set the variable to that value.
|
|
* If no value is given, unset the variable. This is equivalent to
|
|
:command:`unset(<variable>) <unset>`.
|
|
|
|
If the ``PARENT_SCOPE`` option is given the variable will be set in
|
|
the scope above the current scope. Each new directory or :command:`function`
|
|
command creates a new scope. A scope can also be created with the
|
|
:command:`block` command. This command will set the value of a variable into
|
|
the parent directory, calling function or encompassing scope (whichever is
|
|
applicable to the case at hand). The previous state of the variable's value
|
|
stays the same in the current scope (e.g., if it was undefined before, it is
|
|
still undefined and if it had a value, it is still that value).
|
|
|
|
The :command:`block(PROPAGATE)` and :command:`return(PROPAGATE)` commands
|
|
can be used as an alternate method to the :command:`set(PARENT_SCOPE)`
|
|
and :command:`unset(PARENT_SCOPE)` commands to update the parent scope.
|
|
|
|
.. include:: UNSET_NOTE.txt
|
|
|
|
Set Cache Entry
|
|
^^^^^^^^^^^^^^^
|
|
|
|
.. signature::
|
|
set(<variable> <value>... CACHE <type> <docstring> [FORCE])
|
|
:target: CACHE
|
|
|
|
Sets the given cache ``<variable>`` (cache entry). Since cache entries
|
|
are meant to provide user-settable values this does not overwrite
|
|
existing cache entries by default. Use the ``FORCE`` option to
|
|
overwrite existing entries.
|
|
|
|
The ``<type>`` must be specified as one of:
|
|
|
|
``BOOL``
|
|
Boolean ``ON/OFF`` value.
|
|
:manual:`cmake-gui(1)` offers a checkbox.
|
|
|
|
``FILEPATH``
|
|
Path to a file on disk.
|
|
:manual:`cmake-gui(1)` offers a file dialog.
|
|
|
|
``PATH``
|
|
Path to a directory on disk.
|
|
:manual:`cmake-gui(1)` offers a file dialog.
|
|
|
|
``STRING``
|
|
A line of text.
|
|
:manual:`cmake-gui(1)` offers a text field or a drop-down selection
|
|
if the :prop_cache:`STRINGS` cache entry property is set.
|
|
|
|
``INTERNAL``
|
|
A line of text.
|
|
:manual:`cmake-gui(1)` does not show internal entries.
|
|
They may be used to store variables persistently across runs.
|
|
Use of this type implies ``FORCE``.
|
|
|
|
The ``<docstring>`` must be specified as a line of text
|
|
providing a quick summary of the option
|
|
for presentation to :manual:`cmake-gui(1)` users.
|
|
|
|
If the cache entry does not exist prior to the call or the ``FORCE``
|
|
option is given then the cache entry will be set to the given value.
|
|
|
|
.. note::
|
|
|
|
The content of the cache variable will not be directly accessible
|
|
if a normal variable of the same name already exists
|
|
(see :ref:`rules of variable evaluation <CMake Language Variables>`).
|
|
If policy :policy:`CMP0126` is set to ``OLD``, any normal variable
|
|
binding in the current scope will be removed.
|
|
|
|
It is possible for the cache entry to exist prior to the call but
|
|
have no type set if it was created on the :manual:`cmake(1)` command
|
|
line by a user through the :option:`-D\<var\>=\<value\> <cmake -D>` option
|
|
without specifying a type. In this case the ``set`` command will add the
|
|
type. Furthermore, if the ``<type>`` is ``PATH`` or ``FILEPATH``
|
|
and the ``<value>`` provided on the command line is a relative path,
|
|
then the ``set`` command will treat the path as relative to the
|
|
current working directory and convert it to an absolute path.
|
|
|
|
Set Environment Variable
|
|
^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
.. signature::
|
|
set(ENV{<variable>} [<value>])
|
|
:target: ENV
|
|
|
|
Sets an :manual:`Environment Variable <cmake-env-variables(7)>`
|
|
to the given value.
|
|
Subsequent calls of ``$ENV{<variable>}`` will return this new value.
|
|
|
|
This command affects only the current CMake process, not the process
|
|
from which CMake was called, nor the system environment at large,
|
|
nor the environment of subsequent build or test processes.
|
|
|
|
If no argument is given after ``ENV{<variable>}`` or if ``<value>`` is
|
|
an empty string, then this command will clear any existing value of the
|
|
environment variable.
|
|
|
|
Arguments after ``<value>`` are ignored. If extra arguments are found,
|
|
then an author warning is issued.
|
|
|
|
See Also
|
|
^^^^^^^^
|
|
|
|
* :command:`unset`
|