AutoMoc: Take AUTOMOC_BUILD_DIR into account in depfile

For the Ninja generator and targets that have AUTOMOC_BUILD_DIR set, the
AutoMoc target was always out of date.

That was because the depfile in the AutoMoc build directory was
referencing the wrong timestamp file:
    target_autogen/timestamp: ...dependencies...
instead of
    automoc_build_dir/timestamp: ...dependencies...

Use the relative path of the timestamp file as rule name for the
depfile.  That path is calculated with AUTOMOC_BUILD_DIR taken into
account.

Fixes: #23547

1 files changed, 1 insertions, 0 deletions

diff --git a/Source/cmQtAutoGenInitializer.h b/Source/cmQtAutoGenInitializer.h
index 603c537..33749ba 100644
--- a/Source/cmQtAutoGenInitializer.h
+++ b/Source/cmQtAutoGenInitializer.h
@@ -178,6 +178,7 @@ private:
   {
     std::string Info;
     std::string Build;
+    std::string RelativeBuild;
     std::string Work;
     ConfigString Include;
     std::string IncludeGenExp;