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source_group
------------
Define a grouping for source files in IDE project generation.
There are two different signatures to create source groups.
.. code-block:: cmake
source_group(<name> [FILES <src>...] [REGULAR_EXPRESSION <regex>])
source_group(TREE <root> [PREFIX <prefix>] [FILES <src>...])
Defines a group into which sources will be placed in project files.
This is intended to set up file tabs in Visual Studio.
The options are:
``TREE``
CMake will automatically detect, from ``<src>`` files paths, source groups
it needs to create, to keep structure of source groups analogically to the
actual files and directories structure in the project. Paths of ``<src>``
files will be cut to be relative to ``<root>``.
``PREFIX``
Source group and files located directly in ``<root>`` path, will be placed
in ``<prefix>`` source groups.
``FILES``
Any source file specified explicitly will be placed in group
``<name>``. Relative paths are interpreted with respect to the
current source directory.
``REGULAR_EXPRESSION``
Any source file whose name matches the regular expression will
be placed in group ``<name>``.
If a source file matches multiple groups, the *last* group that
explicitly lists the file with ``FILES`` will be favored, if any.
If no group explicitly lists the file, the *last* group whose
regular expression matches the file will be favored.
The ``<name>`` of the group and ``<prefix>`` argument may contain backslashes
to specify subgroups:
.. code-block:: cmake
source_group(outer\\inner ...)
source_group(TREE <root> PREFIX sources\\inc ...)
For backwards compatibility, the short-hand signature
.. code-block:: cmake
source_group(<name> <regex>)
is equivalent to
.. code-block:: cmake
source_group(<name> REGULAR_EXPRESSION <regex>)
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