Automoc: Don't create automoc targets if Qt is not used (#13999)

Commit 79568f95 (automoc: Add source file to target early to set the
linker language, 2013-02-20) changed automoc initialization to a two
step process. In the first step, the generated source file was added
to the target, which allows the link language to be determined.

However, this bypassed the check for the availability of Qt itself.
At build-time the automoc file could not be generated because the moc
tool was not available to create it.

The solution is to only add the automoc file to the target if Qt is
found.

2 files changed, 11 insertions, 0 deletions

diff --git a/Tests/QtAutomocNoQt/CMakeLists.txt b/Tests/QtAutomocNoQt/CMakeLists.txt
new file mode 100644
index 0000000000..b26e471174
--- /dev/null
+++ b/Tests/QtAutomocNoQt/CMakeLists.txt
@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 2.8)
+
+project(QtAutomocNoQt)
+
+set(CMAKE_AUTOMOC ON)
+
+add_executable(hello main.c)
diff --git a/Tests/QtAutomocNoQt/main.c b/Tests/QtAutomocNoQt/main.c
new file mode 100644
index 0000000000..8488f4e58f
--- /dev/null
+++ b/Tests/QtAutomocNoQt/main.c
@@ -0,0 +1,4 @@
+int main(void)
+{
+  return 0;
+}