Merge topic 'ninja-custom-command-depends'

082ccd7530 add_custom_command: Add DEPENDS_EXPLICIT_ONLY option for Ninja

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !8198

Help/command/add_custom_command.rst

@@ -25,7 +25,8 @@ The first signature is for adding a custom command to produce an output:
                      [DEPFILE depfile]
                      [JOB_POOL job_pool]
                      [VERBATIM] [APPEND] [USES_TERMINAL]
-                     [COMMAND_EXPAND_LISTS])
+                     [COMMAND_EXPAND_LISTS]
+                     [DEPENDS_EXPLICIT_ONLY])
 
 This defines a command to generate specified ``OUTPUT`` file(s).
 A target created in the same directory (``CMakeLists.txt`` file)
@@ -357,6 +358,21 @@ The options are:
   :ref:`Makefile Generators`, :ref:`Visual Studio Generators`,
   and the :generator:`Xcode` generator.
 
+``DEPENDS_EXPLICIT_ONLY``
+
+  .. versionadded:: 3.27
+
+  Indicate that the command's ``DEPENDS`` argument represents all files
+  required by the command and implicit dependencies are not required.
+
+  Without this option, if any target uses the output of the custom command,
+  CMake will consider that target's dependencies as implicit dependencies for
+  the custom command in case this custom command requires files implicitly
+  created by those targets.
+
+  Only the :ref:`Ninja Generators` actually use this information to remove
+  unnecessary implicit dependencies.
+
 Examples: Generating Files
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 

Help/release/dev/ninja-custom-command-depends.rst

@@ -0,0 +1,7 @@
+ninja-custom-command-depends
+----------------------------
+
+* The :command:`add_custom_command` command gained a new
+  ``DEPENDS_EXPLICIT_ONLY`` option to tell the :ref:`Ninja Generators`
+  not to add any dependencies implied by the target to which it is
+  attached.