Qt4: Fix moc command dependencies for incremental build.

Since commit v2.8.12~327^2 (Qt4Macros: Allow specifying a TARGET
in invokations of macros., 2013-02-26), a parameters file is
populated with moc arguments at generate-time.

When the compile definitions or include directories change, the
parameters file is updated but moc is not re-run in response.

Fix that by making the moc invocation depend on the parameters file.

Reported-At: https://bugreports.qt-project.org/browse/QTBUG-36970

3 files changed, 30 insertions, 0 deletions

diff --git a/Tests/Qt4Targets/IncrementalMoc/CMakeLists.txt b/Tests/Qt4Targets/IncrementalMoc/CMakeLists.txt
new file mode 100644
index 0000000..4ba0ced
--- /dev/null
+++ b/Tests/Qt4Targets/IncrementalMoc/CMakeLists.txt
@@ -0,0 +1,13 @@
+
+cmake_minimum_required(VERSION 2.8.12)
+project(IncrementalMoc)
+
+find_package(Qt4 REQUIRED)
+
+qt4_generate_moc(foo.h moc_foo.cpp)
+
+add_library(testlib foo.cpp moc_foo.cpp)
+target_link_libraries(testlib Qt4::QtCore)
+if (ADD_DEF)
+  target_compile_definitions(testlib PRIVATE NEW_DEF)
+endif()
diff --git a/Tests/Qt4Targets/IncrementalMoc/foo.cpp b/Tests/Qt4Targets/IncrementalMoc/foo.cpp
new file mode 100644
index 0000000..e924f7e
--- /dev/null
+++ b/Tests/Qt4Targets/IncrementalMoc/foo.cpp
@@ -0,0 +1,8 @@
+
+#include "foo.h"
+
+Foo::Foo()
+  : QObject(0)
+{
+
+}
diff --git a/Tests/Qt4Targets/IncrementalMoc/foo.h b/Tests/Qt4Targets/IncrementalMoc/foo.h
new file mode 100644
index 0000000..38d899f
--- /dev/null
+++ b/Tests/Qt4Targets/IncrementalMoc/foo.h
@@ -0,0 +1,9 @@
+
+#include <QObject>
+
+class Foo : QObject
+{
+  Q_OBJECT
+public:
+  Foo();
+};