Autogen: Add support for response files for moc predef targets

Add support for response files for moc predef targets and make the limit when
to use response files for autogen targets configurable.

6 files changed, 38 insertions, 0 deletions

diff --git a/Help/manual/cmake-properties.7.rst b/Help/manual/cmake-properties.7.rst
index 276cb13..28d61f7 100644
--- a/Help/manual/cmake-properties.7.rst
+++ b/Help/manual/cmake-properties.7.rst
@@ -130,6 +130,7 @@ Properties on Targets
    /prop_tgt/ARCHIVE_OUTPUT_NAME
    /prop_tgt/ARCHIVE_OUTPUT_NAME_CONFIG
    /prop_tgt/AUTOGEN_BUILD_DIR
+   /prop_tgt/AUTOGEN_COMMAND_LINE_LENGTH_MAX
    /prop_tgt/AUTOGEN_ORIGIN_DEPENDS
    /prop_tgt/AUTOGEN_PARALLEL
    /prop_tgt/AUTOGEN_TARGET_DEPENDS
diff --git a/Help/manual/cmake-variables.7.rst b/Help/manual/cmake-variables.7.rst
index a73494e..5f47c6e 100644
--- a/Help/manual/cmake-variables.7.rst
+++ b/Help/manual/cmake-variables.7.rst
@@ -400,6 +400,7 @@ Variables that Control the Build
    /variable/CMAKE_APPLE_SILICON_PROCESSOR
    /variable/CMAKE_ARCHIVE_OUTPUT_DIRECTORY
    /variable/CMAKE_ARCHIVE_OUTPUT_DIRECTORY_CONFIG
+   /variable/CMAKE_AUTOGEN_COMMAND_LINE_LENGTH_MAX
    /variable/CMAKE_AUTOGEN_ORIGIN_DEPENDS
    /variable/CMAKE_AUTOGEN_PARALLEL
    /variable/CMAKE_AUTOGEN_USE_SYSTEM_INCLUDE
diff --git a/Help/prop_tgt/AUTOGEN_COMMAND_LINE_LENGTH_MAX.rst b/Help/prop_tgt/AUTOGEN_COMMAND_LINE_LENGTH_MAX.rst
new file mode 100644
index 0000000..f1e51a7
--- /dev/null
+++ b/Help/prop_tgt/AUTOGEN_COMMAND_LINE_LENGTH_MAX.rst
@@ -0,0 +1,18 @@
+AUTOGEN_COMMAND_LINE_LENGTH_MAX
+-------------------------------
+
+.. versionadded:: 3.29
+
+Command line length limit for autogen targets, i.e. ``moc`` or ``uic``,
+that triggers the use of response files on Windows instead of passing all
+arguments to the command line.
+
+- An empty (or unset) value sets the limit to 32000
+- A positive non zero integer value sets the exact command line length
+  limit.
+
+By default ``AUTOGEN_COMMAND_LINE_LENGTH_MAX`` is initialized from
+:variable:`CMAKE_AUTOGEN_COMMAND_LINE_LENGTH_MAX`.
+
+See the :manual:`cmake-qt(7)` manual for more information on using CMake
+with Qt.
diff --git a/Help/prop_tgt/AUTOMOC.rst b/Help/prop_tgt/AUTOMOC.rst
index 0feb2e8..6f58afb 100644
--- a/Help/prop_tgt/AUTOMOC.rst
+++ b/Help/prop_tgt/AUTOMOC.rst
@@ -247,5 +247,9 @@ will be generated when this variable is ``ON``.
 This target property controls the number of ``moc`` or ``uic`` processes to
 start in parallel during builds.
 
+:prop_tgt:`AUTOGEN_COMMAND_LINE_LENGTH_MAX`:
+This target property controls the limit when to use response files for
+``moc`` or ``uic`` processes on Windows.
+
 See the :manual:`cmake-qt(7)` manual for more information on using CMake
 with Qt.
diff --git a/Help/prop_tgt/AUTOUIC.rst b/Help/prop_tgt/AUTOUIC.rst
index dc854b2..95366ee 100644
--- a/Help/prop_tgt/AUTOUIC.rst
+++ b/Help/prop_tgt/AUTOUIC.rst
@@ -81,5 +81,9 @@ will be generated when this variable is ``ON``.
 This target property controls the number of ``moc`` or ``uic`` processes to
 start in parallel during builds.
 
+:prop_tgt:`AUTOGEN_COMMAND_LINE_LENGTH_MAX`:
+This target property controls the limit when to use response files for
+``moc`` or ``uic`` processes on Windows.
+
 See the :manual:`cmake-qt(7)` manual for more information on using CMake
 with Qt.
diff --git a/Help/variable/CMAKE_AUTOGEN_COMMAND_LINE_LENGTH_MAX.rst b/Help/variable/CMAKE_AUTOGEN_COMMAND_LINE_LENGTH_MAX.rst
new file mode 100644
index 0000000..eabda43
--- /dev/null
+++ b/Help/variable/CMAKE_AUTOGEN_COMMAND_LINE_LENGTH_MAX.rst
@@ -0,0 +1,10 @@
+CMAKE_AUTOGEN_COMMAND_LINE_LENGTH_MAX
+-------------------------------------
+
+.. versionadded:: 3.29
+
+Command line length limit for autogen targets, i.e. ``moc`` or ``uic``,
+that triggers the use of response files on Windows instead of passing all
+arguments to the command line.
+
+By default ``CMAKE_AUTOGEN_COMMAND_LINE_LENGTH_MAX`` is unset.