Merge topic 'custom-command-comment-genex'

26d813092b add_custom_{command,target}: add genex support for COMMENT
60a5a39022 cmCustomCommandGenerator: refactor GetComment to return std::string

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !7887

Help/command/add_custom_command.rst

@@ -140,6 +140,10 @@ The options are:
   Display the given message before the commands are executed at
   build time.
 
+  .. versionadded:: 3.26
+    Arguments to ``COMMENT`` may use
+    :manual:`generator expressions <cmake-generator-expressions(7)>`.
+
 ``DEPENDS``
   Specify files on which the command depends.  Each argument is converted
   to a dependency as follows:

Help/command/add_custom_target.rst

@@ -109,6 +109,10 @@ The options are:
   Display the given message before the commands are executed at
   build time.
 
+  .. versionadded:: 3.26
+    Arguments to ``COMMENT`` may use
+    :manual:`generator expressions <cmake-generator-expressions(7)>`.
+
 ``DEPENDS``
   Reference files and outputs of custom commands created with
   :command:`add_custom_command` command calls in the same directory

Help/release/dev/custom-command-comment-genex.rst

@@ -0,0 +1,6 @@
+custom-command-comment-genex
+----------------------------
+
+* :command:`add_custom_command` and :command:`add_custom_target` now
+  support :manual:`generator expressions <cmake-generator-expressions(7)>`
+  in their ``COMMENT`` option.