qt 6.5.3

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/ADDITIONAL_CLEAN_FILES.rst

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+ADDITIONAL_CLEAN_FILES
+----------------------
+
+.. versionadded:: 3.15
+
+A :ref:`;-list <CMake Language Lists>` of files or directories that will be
+removed as a part of the global ``clean`` target.  It is useful for
+specifying generated files or directories that are used by multiple targets
+or by CMake itself, or that are generated in ways which cannot be captured as
+outputs or byproducts of custom commands.
+
+If an additional clean file is specific to a single target only, then the
+:prop_tgt:`ADDITIONAL_CLEAN_FILES` target property would usually be a better
+choice than this directory property.
+
+Relative paths are allowed and are interpreted relative to the
+current binary directory.
+
+Contents of ``ADDITIONAL_CLEAN_FILES`` may use
+:manual:`generator expressions <cmake-generator-expressions(7)>`.
+
+This property only works for the :generator:`Ninja` and the Makefile
+generators.  It is ignored by other generators.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/ADDITIONAL_MAKE_CLEAN_FILES.rst

@@ -0,0 +1,17 @@
+ADDITIONAL_MAKE_CLEAN_FILES
+---------------------------
+
+.. deprecated:: 3.15
+
+  Use :prop_dir:`ADDITIONAL_CLEAN_FILES` instead.
+
+Additional files to remove during the clean stage.
+
+A :ref:`;-list <CMake Language Lists>` of files that will be removed as a
+part of the ``make clean`` target.
+
+Arguments to ``ADDITIONAL_MAKE_CLEAN_FILES`` may use
+:manual:`generator expressions <cmake-generator-expressions(7)>`.
+
+This property only works for the Makefile generators.
+It is ignored on other generators.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/BINARY_DIR.rst

@@ -0,0 +1,7 @@
+BINARY_DIR
+----------
+
+.. versionadded:: 3.7
+
+This read-only directory property reports absolute path to the binary
+directory corresponding to the source on which it is read.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/BUILDSYSTEM_TARGETS.rst

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+BUILDSYSTEM_TARGETS
+-------------------
+
+.. versionadded:: 3.7
+
+This read-only directory property contains a
+:ref:`semicolon-separated list <CMake Language Lists>` of buildsystem targets added in the
+directory by calls to the :command:`add_library`, :command:`add_executable`,
+and :command:`add_custom_target` commands.  The list does not include any
+:ref:`Imported Targets` or :ref:`Alias Targets`, but does include
+:ref:`Interface Libraries`.  Each entry in the list is the logical name
+of a target, suitable to pass to the :command:`get_property` command
+``TARGET`` option.
+
+See also the :prop_dir:`IMPORTED_TARGETS` directory property.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/CACHE_VARIABLES.rst

@@ -0,0 +1,7 @@
+CACHE_VARIABLES
+---------------
+
+List of cache variables available in the current directory.
+
+This read-only property specifies the list of CMake cache variables
+currently defined.  It is intended for debugging purposes.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/CLEAN_NO_CUSTOM.rst

@@ -0,0 +1,6 @@
+CLEAN_NO_CUSTOM
+---------------
+
+Set to true to tell :ref:`Makefile Generators` not to remove the outputs of
+custom commands for this directory during the ``make clean`` operation.
+This is ignored on other generators because it is not possible to implement.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/CMAKE_CONFIGURE_DEPENDS.rst

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+CMAKE_CONFIGURE_DEPENDS
+-----------------------
+
+Tell CMake about additional input files to the configuration process.
+If any named file is modified the build system will re-run CMake to
+re-configure the file and generate the build system again.
+
+Specify files as a semicolon-separated list of paths.  Relative paths
+are interpreted as relative to the current source directory.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/COMPILE_DEFINITIONS.rst

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+COMPILE_DEFINITIONS
+-------------------
+
+Preprocessor definitions for compiling a directory's sources.
+
+This property specifies the list of options given so far to the
+:command:`add_compile_definitions` (or :command:`add_definitions`) command.
+
+The ``COMPILE_DEFINITIONS`` property may be set to a semicolon-separated
+list of preprocessor definitions using the syntax ``VAR`` or ``VAR=value``.
+Function-style definitions are not supported.  CMake will
+automatically escape the value correctly for the native build system
+(note that CMake language syntax may require escapes to specify some
+values).
+
+This property will be initialized in each directory by its value in the
+directory's parent.
+
+CMake will automatically drop some definitions that are not supported
+by the native build tool.
+
+.. versionadded:: 3.26
+  Any leading ``-D`` on an item will be removed.
+
+.. include:: /include/COMPILE_DEFINITIONS_DISCLAIMER.txt
+
+Contents of ``COMPILE_DEFINITIONS`` may use "generator expressions" with
+the syntax ``$<...>``.  See the :manual:`cmake-generator-expressions(7)`
+manual for available expressions.  See the :manual:`cmake-buildsystem(7)`
+manual for more on defining buildsystem properties.
+
+The corresponding :prop_dir:`COMPILE_DEFINITIONS_<CONFIG>` property may
+be set to specify per-configuration definitions.  Generator expressions
+should be preferred instead of setting the alternative property.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/COMPILE_DEFINITIONS_CONFIG.rst

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+COMPILE_DEFINITIONS_<CONFIG>
+----------------------------
+
+Ignored.  See CMake Policy :policy:`CMP0043`.
+
+Per-configuration preprocessor definitions in a directory.
+
+This is the configuration-specific version of :prop_dir:`COMPILE_DEFINITIONS`
+where ``<CONFIG>`` is an upper-case name (ex. ``COMPILE_DEFINITIONS_DEBUG``).
+
+This property will be initialized in each directory by its value in
+the directory's parent.
+
+Contents of ``COMPILE_DEFINITIONS_<CONFIG>`` may use "generator expressions"
+with the syntax ``$<...>``.  See the :manual:`cmake-generator-expressions(7)`
+manual for available expressions.  See the :manual:`cmake-buildsystem(7)`
+manual for more on defining buildsystem properties.
+
+Generator expressions should be preferred instead of setting this property.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/COMPILE_OPTIONS.rst

@@ -0,0 +1,16 @@
+COMPILE_OPTIONS
+---------------
+
+List of options to pass to the compiler.
+
+This property holds a :ref:`semicolon-separated list <CMake Language Lists>` of options
+given so far to the :command:`add_compile_options` command.
+
+This property is used to initialize the :prop_tgt:`COMPILE_OPTIONS` target
+property when a target is created, which is used by the generators to set
+the options for the compiler.
+
+Contents of ``COMPILE_OPTIONS`` may use "generator expressions" with the
+syntax ``$<...>``.  See the :manual:`cmake-generator-expressions(7)` manual
+for available expressions.  See the :manual:`cmake-buildsystem(7)` manual
+for more on defining buildsystem properties.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/DEFINITIONS.rst

@@ -0,0 +1,13 @@
+DEFINITIONS
+-----------
+
+For CMake 2.4 compatibility only.  Use :prop_dir:`COMPILE_DEFINITIONS`
+instead.
+
+This read-only property specifies the list of flags given so far to
+the :command:`add_definitions` command.  It is intended for debugging
+purposes.  Use the :prop_dir:`COMPILE_DEFINITIONS` directory property
+instead.
+
+This built-in read-only property does not exist if policy
+:policy:`CMP0059` is set to ``NEW``.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/EXCLUDE_FROM_ALL.rst

@@ -0,0 +1,13 @@
+EXCLUDE_FROM_ALL
+----------------
+
+Set this directory property to a true value on a subdirectory to exclude
+its targets from the "all" target of its ancestors.  If excluded, running
+e.g. ``make`` in the parent directory will not build targets the
+subdirectory by default.  This does not affect the "all" target of the
+subdirectory itself.  Running e.g. ``make`` inside the subdirectory will
+still build its targets.
+
+If the :prop_tgt:`EXCLUDE_FROM_ALL` target property is set on a target
+then its value determines whether the target is included in the "all"
+target of this directory and its ancestors.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/IMPLICIT_DEPENDS_INCLUDE_TRANSFORM.rst

@@ -0,0 +1,34 @@
+IMPLICIT_DEPENDS_INCLUDE_TRANSFORM
+----------------------------------
+
+Specify ``#include`` line transforms for dependencies in a directory.
+
+This property specifies rules to transform macro-like ``#include`` lines
+during implicit dependency scanning of C and C++ source files.  The
+list of rules must be semicolon-separated with each entry of the form
+``A_MACRO(%)=value-with-%`` (the ``%`` must be literal).  During dependency
+scanning occurrences of ``A_MACRO(...)`` on ``#include`` lines will be
+replaced by the value given with the macro argument substituted for
+``%``.  For example, the entry
+
+::
+
+  MYDIR(%)=<mydir/%>
+
+will convert lines of the form
+
+::
+
+  #include MYDIR(myheader.h)
+
+to
+
+::
+
+  #include <mydir/myheader.h>
+
+allowing the dependency to be followed.
+
+This property applies to sources in all targets within a directory.
+The property value is initialized in each directory by its value in
+the directory's parent.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/IMPORTED_TARGETS.rst

@@ -0,0 +1,14 @@
+IMPORTED_TARGETS
+----------------
+
+.. versionadded:: 3.21
+
+This read-only directory property contains a
+:ref:`semicolon-separated list <CMake Language Lists>` of
+:ref:`Imported Targets` added in the directory by calls to the
+:command:`add_library` and :command:`add_executable` commands.
+Each entry in the list is the logical name of a target, suitable
+to pass to the :command:`get_property` command ``TARGET`` option
+when called in the same directory.
+
+See also the :prop_dir:`BUILDSYSTEM_TARGETS` directory property.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/INCLUDE_DIRECTORIES.rst

@@ -0,0 +1,32 @@
+INCLUDE_DIRECTORIES
+-------------------
+
+List of preprocessor include file search directories.
+
+This property specifies the list of directories given so far to the
+:command:`include_directories` command.
+
+This property is used to populate the :prop_tgt:`INCLUDE_DIRECTORIES`
+target property, which is used by the generators to set the include
+directories for the compiler.
+
+In addition to accepting values from that command, values may be set
+directly on any directory using the :command:`set_property` command, and can be
+set on the current directory using the :command:`set_directory_properties`
+command.  A directory gets its initial value from its parent directory if it has
+one.  The initial value of the :prop_tgt:`INCLUDE_DIRECTORIES` target property
+comes from the value of this property.  Both directory and target property
+values are adjusted by calls to the :command:`include_directories` command.
+Calls to :command:`set_property` or :command:`set_directory_properties`,
+however, will update the directory property value without updating target
+property values.  Therefore direct property updates must be made before
+calls to :command:`add_executable` or :command:`add_library` for targets
+they are meant to affect.
+
+The target property values are used by the generators to set the
+include paths for the compiler.
+
+Contents of ``INCLUDE_DIRECTORIES`` may use "generator expressions" with
+the syntax ``$<...>``.  See the :manual:`cmake-generator-expressions(7)`
+manual for available expressions.  See the :manual:`cmake-buildsystem(7)`
+manual for more on defining buildsystem properties.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/INCLUDE_REGULAR_EXPRESSION.rst

@@ -0,0 +1,9 @@
+INCLUDE_REGULAR_EXPRESSION
+--------------------------
+
+Include file scanning regular expression.
+
+This property specifies the regular expression used during
+dependency scanning to match include files that should be followed.
+See the :command:`include_regular_expression` command for a high-level
+interface to set this property.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/INTERPROCEDURAL_OPTIMIZATION.rst

@@ -0,0 +1,6 @@
+INTERPROCEDURAL_OPTIMIZATION
+----------------------------
+
+This directory property does not exist anymore.
+
+See the target property :prop_tgt:`INTERPROCEDURAL_OPTIMIZATION` instead.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/INTERPROCEDURAL_OPTIMIZATION_CONFIG.rst

@@ -0,0 +1,6 @@
+INTERPROCEDURAL_OPTIMIZATION_<CONFIG>
+-------------------------------------
+
+This directory property does not exist anymore.
+
+See the target property :prop_tgt:`INTERPROCEDURAL_OPTIMIZATION_<CONFIG>` instead.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/LABELS.rst

@@ -0,0 +1,15 @@
+LABELS
+------
+
+.. versionadded:: 3.10
+
+Specify a list of text labels associated with a directory and all of its
+subdirectories. This is equivalent to setting the :prop_tgt:`LABELS` target
+property and the :prop_test:`LABELS` test property on all targets and tests in
+the current directory and subdirectories. Note: Launchers must enabled to
+propagate labels to targets.
+
+The :variable:`CMAKE_DIRECTORY_LABELS` variable can be used to initialize this
+property.
+
+The list is reported in dashboard submissions.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/LINK_DIRECTORIES.rst

@@ -0,0 +1,17 @@
+LINK_DIRECTORIES
+----------------
+
+List of linker search directories.
+
+This property holds a :ref:`semicolon-separated list <CMake Language Lists>` of directories
+and is typically populated using the :command:`link_directories` command.
+It gets its initial value from its parent directory, if it has one.
+
+The directory property is used to initialize the :prop_tgt:`LINK_DIRECTORIES`
+target property when a target is created.  That target property is used
+by the generators to set the library search directories for the linker.
+
+Contents of ``LINK_DIRECTORIES`` may use "generator expressions" with
+the syntax ``$<...>``.  See the :manual:`cmake-generator-expressions(7)`
+manual for available expressions.  See the :manual:`cmake-buildsystem(7)`
+manual for more on defining buildsystem properties.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/LINK_OPTIONS.rst

@@ -0,0 +1,19 @@
+LINK_OPTIONS
+------------
+
+.. versionadded:: 3.13
+
+List of options to use for the link step of shared library, module
+and executable targets as well as the device link step.
+
+This property holds a :ref:`semicolon-separated list <CMake Language Lists>` of options
+given so far to the :command:`add_link_options` command.
+
+This property is used to initialize the :prop_tgt:`LINK_OPTIONS` target
+property when a target is created, which is used by the generators to set
+the options for the compiler.
+
+Contents of ``LINK_OPTIONS`` may use "generator expressions" with the
+syntax ``$<...>``.  See the :manual:`cmake-generator-expressions(7)` manual
+for available expressions.  See the :manual:`cmake-buildsystem(7)` manual
+for more on defining buildsystem properties.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/LISTFILE_STACK.rst

@@ -0,0 +1,10 @@
+LISTFILE_STACK
+--------------
+
+The current stack of listfiles being processed.
+
+This property is mainly useful when trying to debug errors in your
+CMake scripts.  It returns a list of what list files are currently
+being processed, in order.  So if one listfile does an
+:command:`include` command then that is effectively pushing the
+included listfile onto the stack.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/MACROS.rst

@@ -0,0 +1,8 @@
+MACROS
+------
+
+List of macro commands available in the current directory.
+
+This read-only property specifies the list of CMake macros currently
+defined.  It is intended for debugging purposes.  See the :command:`macro`
+command.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/PARENT_DIRECTORY.rst

@@ -0,0 +1,8 @@
+PARENT_DIRECTORY
+----------------
+
+Source directory that added current subdirectory.
+
+This read-only property specifies the source directory that added the
+current source directory as a subdirectory of the build.  In the
+top-level directory the value is the empty-string.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/RULE_LAUNCH_COMPILE.rst

@@ -0,0 +1,13 @@
+RULE_LAUNCH_COMPILE
+-------------------
+
+Specify a launcher for compile rules.
+
+.. note::
+  This property is intended for internal use by :manual:`ctest(1)`.  Projects
+  and developers should use the :prop_tgt:`<LANG>_COMPILER_LAUNCHER` target
+  properties or the associated :variable:`CMAKE_<LANG>_COMPILER_LAUNCHER`
+  variables instead.
+
+See the :prop_gbl:`global property <RULE_LAUNCH_COMPILE>` of the same name
+for details.  This overrides the global property for a directory.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/RULE_LAUNCH_CUSTOM.rst

@@ -0,0 +1,7 @@
+RULE_LAUNCH_CUSTOM
+------------------
+
+Specify a launcher for custom rules.
+
+See the global property of the same name for details.  This overrides
+the global property for a directory.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/RULE_LAUNCH_LINK.rst

@@ -0,0 +1,13 @@
+RULE_LAUNCH_LINK
+----------------
+
+Specify a launcher for link rules.
+
+.. note::
+  This property is intended for internal use by :manual:`ctest(1)`.  Projects
+  and developers should use the :prop_tgt:`<LANG>_LINKER_LAUNCHER` target
+  properties or the associated :variable:`CMAKE_<LANG>_LINKER_LAUNCHER`
+  variables instead.
+
+See the :prop_gbl:`global property <RULE_LAUNCH_LINK>` of the same name for
+details.  This overrides the global property for a directory.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/SOURCE_DIR.rst

@@ -0,0 +1,7 @@
+SOURCE_DIR
+----------
+
+.. versionadded:: 3.7
+
+This read-only directory property reports absolute path to the source
+directory on which it is read.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/SUBDIRECTORIES.rst

@@ -0,0 +1,17 @@
+SUBDIRECTORIES
+--------------
+
+.. versionadded:: 3.7
+
+This read-only directory property contains a
+:ref:`semicolon-separated list <CMake Language Lists>` of subdirectories processed so far by
+the :command:`add_subdirectory` or :command:`subdirs` commands.  Each entry is
+the absolute path to the source directory (containing the ``CMakeLists.txt``
+file).  This is suitable to pass to the :command:`get_property` command
+``DIRECTORY`` option.
+
+.. note::
+
+  The :command:`subdirs` command does not process its arguments until
+  after the calling directory is fully processed.  Therefore looking
+  up this property in the current directory will not see them.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/SYSTEM.rst

@@ -0,0 +1,10 @@
+SYSTEM
+------
+
+.. versionadded:: 3.25
+
+This directory property is used to initialize the :prop_tgt:`SYSTEM`
+target property for non-imported targets created in that directory.
+It is set to true by :command:`add_subdirectory` and
+:command:`FetchContent_Declare` when the ``SYSTEM`` option is given
+as an argument to those commands.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/TESTS.rst

@@ -0,0 +1,10 @@
+TESTS
+-----
+
+.. versionadded:: 3.12
+
+List of tests.
+
+This read-only property holds a
+:ref:`semicolon-separated list <CMake Language Lists>` of tests
+defined so far, in the current directory, by the :command:`add_test` command.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/TEST_INCLUDE_FILE.rst

@@ -0,0 +1,9 @@
+TEST_INCLUDE_FILE
+-----------------
+
+Deprecated.  Use :prop_dir:`TEST_INCLUDE_FILES` instead.
+
+A cmake file that will be included when ctest is run.
+
+If you specify ``TEST_INCLUDE_FILE``, that file will be included and
+processed when ctest is run on the directory.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/TEST_INCLUDE_FILES.rst

@@ -0,0 +1,9 @@
+TEST_INCLUDE_FILES
+------------------
+
+.. versionadded:: 3.10
+
+A list of cmake files that will be included when ctest is run.
+
+If you specify ``TEST_INCLUDE_FILES``, those files will be included and
+processed when ctest is run on the directory.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/VARIABLES.rst

@@ -0,0 +1,7 @@
+VARIABLES
+---------
+
+List of variables defined in the current directory.
+
+This read-only property specifies the list of CMake variables
+currently defined.  It is intended for debugging purposes.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/VS_GLOBAL_SECTION_POST_section.rst

@@ -0,0 +1,31 @@
+VS_GLOBAL_SECTION_POST_<section>
+--------------------------------
+
+Specify a postSolution global section in Visual Studio.
+
+Setting a property like this generates an entry of the following form
+in the solution file:
+
+::
+
+  GlobalSection(<section>) = postSolution
+    <contents based on property value>
+  EndGlobalSection
+
+The property must be set to a semicolon-separated list of ``key=value``
+pairs.  Each such pair will be transformed into an entry in the
+solution global section.  Whitespace around key and value is ignored.
+List elements which do not contain an equal sign are skipped.
+
+This property only works for Visual Studio 9 and above; it is ignored
+on other generators.  The property only applies when set on a
+directory whose ``CMakeLists.txt`` contains a :command:`project` command.
+
+Note that CMake generates postSolution sections ``ExtensibilityGlobals``
+and ``ExtensibilityAddIns`` by default.  If you set the corresponding
+property, it will override the default section.  For example, setting
+``VS_GLOBAL_SECTION_POST_ExtensibilityGlobals`` will override the default
+contents of the ``ExtensibilityGlobals`` section, while keeping
+ExtensibilityAddIns on its default.  However, CMake will always
+add a ``SolutionGuid`` to the ``ExtensibilityGlobals`` section
+if it is not specified explicitly.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/VS_GLOBAL_SECTION_PRE_section.rst

@@ -0,0 +1,22 @@
+VS_GLOBAL_SECTION_PRE_<section>
+-------------------------------
+
+Specify a preSolution global section in Visual Studio.
+
+Setting a property like this generates an entry of the following form
+in the solution file:
+
+::
+
+  GlobalSection(<section>) = preSolution
+    <contents based on property value>
+  EndGlobalSection
+
+The property must be set to a semicolon-separated list of ``key=value``
+pairs.  Each such pair will be transformed into an entry in the
+solution global section.  Whitespace around key and value is ignored.
+List elements which do not contain an equal sign are skipped.
+
+This property only works for Visual Studio 9 and above; it is ignored
+on other generators.  The property only applies when set on a
+directory whose ``CMakeLists.txt`` contains a :command:`project` command.

6.5.3/_tools/cmake/share/cmake-3.27/Help/prop_dir/VS_STARTUP_PROJECT.rst

@@ -0,0 +1,20 @@
+VS_STARTUP_PROJECT
+------------------
+
+.. versionadded:: 3.6
+
+Specify the default startup project in a Visual Studio solution.
+
+The :ref:`Visual Studio Generators` create a ``.sln`` file for each directory
+whose ``CMakeLists.txt`` file calls the :command:`project` command.  Set this
+property in the same directory as a :command:`project` command call (e.g. in
+the top-level ``CMakeLists.txt`` file) to specify the default startup project
+for the corresponding solution file.
+
+The property must be set to the name of an existing target.  This
+will cause that project to be listed first in the generated solution
+file causing Visual Studio to make it the startup project if the
+solution has never been opened before.
+
+If this property is not specified, then the ``ALL_BUILD`` project
+will be the default.