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target_sources
--------------
.. versionadded:: 3.1
Add sources to a target.
.. code-block:: cmake
target_sources(<target>
<INTERFACE|PUBLIC|PRIVATE> [items1...]
[<INTERFACE|PUBLIC|PRIVATE> [items2...] ...])
Specifies sources to use when building a target and/or its dependents.
The named ``<target>`` must have been created by a command such as
:command:`add_executable` or :command:`add_library` or
:command:`add_custom_target` and must not be an
:ref:`ALIAS target <Alias Targets>`. The ``<items>`` may use
:manual:`generator expressions <cmake-generator-expressions(7)>`.
.. versionadded:: 3.20
``<target>`` can be a custom target.
The ``INTERFACE``, ``PUBLIC`` and ``PRIVATE`` keywords are required to
specify the scope of the source file paths (``<items>``) that follow
them. ``PRIVATE`` and ``PUBLIC`` items will populate the :prop_tgt:`SOURCES`
property of ``<target>``, which are used when building the target itself.
``PUBLIC`` and ``INTERFACE`` items will populate the
:prop_tgt:`INTERFACE_SOURCES` property of ``<target>``, which are used
when building dependents. A target created by :command:`add_custom_target`
can only have ``PRIVATE`` scope.
Repeated calls for the same ``<target>`` append items in the order called.
.. versionadded:: 3.3
Allow exporting targets with :prop_tgt:`INTERFACE_SOURCES`.
.. versionadded:: 3.11
Allow setting ``INTERFACE`` items on
:ref:`IMPORTED targets <Imported Targets>`.
.. versionchanged:: 3.13
Relative source file paths are interpreted as being relative to the current
source directory (i.e. :variable:`CMAKE_CURRENT_SOURCE_DIR`).
See policy :policy:`CMP0076`.
A path that begins with a generator expression is left unmodified.
When a target's :prop_tgt:`SOURCE_DIR` property differs from
:variable:`CMAKE_CURRENT_SOURCE_DIR`, use absolute paths in generator
expressions to ensure the sources are correctly assigned to the target.
.. code-block:: cmake
# WRONG: starts with generator expression, but relative path used
target_sources(MyTarget PRIVATE "$<$<CONFIG:Debug>:dbgsrc.cpp>")
# CORRECT: absolute path used inside the generator expression
target_sources(MyTarget PRIVATE "$<$<CONFIG:Debug>:${CMAKE_CURRENT_SOURCE_DIR}/dbgsrc.cpp>")
See the :manual:`cmake-buildsystem(7)` manual for more on defining
buildsystem properties.
File Sets
^^^^^^^^^
.. versionadded:: 3.23
.. code-block:: cmake
target_sources(<target>
[<INTERFACE|PUBLIC|PRIVATE>
[FILE_SET <set> [TYPE <type>] [BASE_DIRS <dirs>...] [FILES <files>...]]...
]...)
Adds a file set to a target, or adds files to an existing file set. Targets
have zero or more named file sets. Each file set has a name, a type, a scope of
``INTERFACE``, ``PUBLIC``, or ``PRIVATE``, one or more base directories, and
files within those directories. The only acceptable type is ``HEADERS``. The
optional default file sets are named after their type. The target may not be a
custom target or :prop_tgt:`FRAMEWORK` target.
Files in a ``PRIVATE`` or ``PUBLIC`` file set are marked as source files for
the purposes of IDE integration. Additionally, files in ``HEADERS`` file sets
have their :prop_sf:`HEADER_FILE_ONLY` property set to ``TRUE``. Files in an
``INTERFACE`` or ``PUBLIC`` file set can be installed with the
:command:`install(TARGETS)` command, and exported with the
:command:`install(EXPORT)` and :command:`export` commands.
Each ``target_sources(FILE_SET)`` entry starts with ``INTERFACE``, ``PUBLIC``, or
``PRIVATE`` and accepts the following arguments:
``FILE_SET <set>``
The name of the file set to create or add to. It must contain only letters,
numbers and underscores. Names starting with a capital letter are reserved
for built-in file sets predefined by CMake. The only predefined set name is
``HEADERS``. All other set names must not start with a capital letter or
underscore.
``TYPE <type>``
Every file set is associated with a particular type of file. ``HEADERS``
is currently the only defined type and it is an error to specify anything
else. As a special case, if the name of the file set is ``HEADERS``, the
type does not need to be specified and the ``TYPE <type>`` arguments can be
omitted. For all other file set names, ``TYPE`` is required.
``BASE_DIRS <dirs>...``
An optional list of base directories of the file set. Any relative path
is treated as relative to the current source directory
(i.e. :variable:`CMAKE_CURRENT_SOURCE_DIR`). If no ``BASE_DIRS`` are
specified when the file set is first created, the value of
:variable:`CMAKE_CURRENT_SOURCE_DIR` is added. This argument supports
:manual:`generator expressions <cmake-generator-expressions(7)>`.
No two base directories for a file set may be sub-directories of each other.
This requirement must be met across all base directories added to a file set,
not just those within a single call to ``target_sources()``.
``FILES <files>...``
An optional list of files to add to the file set. Each file must be in
one of the base directories, or a subdirectory of one of the base
directories. This argument supports
:manual:`generator expressions <cmake-generator-expressions(7)>`.
If relative paths are specified, they are considered relative to
:variable:`CMAKE_CURRENT_SOURCE_DIR` at the time ``target_sources()`` is
called. An exception to this is a path starting with ``$<``. Such paths
are treated as relative to the target's source directory after evaluation
of generator expressions.
The following target properties are set by ``target_sources(FILE_SET)``,
but they should not generally be manipulated directly:
* :prop_tgt:`HEADER_SETS`
* :prop_tgt:`INTERFACE_HEADER_SETS`
* :prop_tgt:`HEADER_SET`
* :prop_tgt:`HEADER_SET_<NAME>`
* :prop_tgt:`HEADER_DIRS`
* :prop_tgt:`HEADER_DIRS_<NAME>`
Target properties related to include directories are also modified by
``target_sources(FILE_SET)`` as follows:
:prop_tgt:`INCLUDE_DIRECTORIES`
If the ``TYPE`` is ``HEADERS``, and the scope of the file set is ``PRIVATE``
or ``PUBLIC``, all of the ``BASE_DIRS`` of the file set are wrapped in
:genex:`$<BUILD_INTERFACE>` and appended to this property.
:prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES`
If the ``TYPE`` is ``HEADERS``, and the scope of the file set is
``INTERFACE`` or ``PUBLIC``, all of the ``BASE_DIRS`` of the file set are
wrapped in :genex:`$<BUILD_INTERFACE>` and appended to this property.
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