From 79568f95ab920158fdcb857c9b99592ad5300a4e Mon Sep 17 00:00:00 2001
From: Stephen Kelly <steveire@gmail.com>
Date: Wed, 20 Feb 2013 17:06:45 +0100
Subject: [PATCH] automoc: Add source file to target early to set the linker
 language

Previously, GetIncludeDirectories was called before calling
target->AddSourceFile(mocCppSource). Since commit a1c4905f (Use the
link information as a source of compile definitions and
includes., 2013-02-12), the include directories are determined by
the link information.

Valid link information requires that the linker language can be
determined, which depends on the source files languages and the
dependent targets languages. In the case of the no_link_languages
target in the unit test, there are no dependencies and the additional
source file no_link_languages_automoc.cpp is added to the target
at generate-time. That file can be used to determine the linker
language, but it must be added to the target before calling
GetIncludeDirectories.
---
 Source/cmGlobalGenerator.cxx   | 10 +++++++++-
 Source/cmQtAutomoc.cxx         | 27 ++++++++++++++++-----------
 Source/cmQtAutomoc.h           |  1 +
 Tests/QtAutomoc/CMakeLists.txt |  6 ++++++
 Tests/QtAutomoc/empty.cpp      |  1 +
 Tests/QtAutomoc/empty.h        |  9 +++++++++
 6 files changed, 42 insertions(+), 12 deletions(-)
 create mode 100644 Tests/QtAutomoc/empty.cpp
 create mode 100644 Tests/QtAutomoc/empty.h

diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index ba295898e1..f2defbb4df 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -1067,6 +1067,8 @@ bool cmGlobalGenerator::CheckTargets()
 void cmGlobalGenerator::CreateAutomocTargets()
 {
 #ifdef CMAKE_BUILD_WITH_CMAKE
+  typedef std::vector<std::pair<cmQtAutomoc, cmTarget*> > Automocs;
+  Automocs automocs;
   for(unsigned int i=0; i < this->LocalGenerators.size(); ++i)
     {
     cmTargets& targets =
@@ -1084,11 +1086,17 @@ void cmGlobalGenerator::CreateAutomocTargets()
         if(target.GetPropertyAsBool("AUTOMOC") && !target.IsImported())
           {
           cmQtAutomoc automoc;
-          automoc.SetupAutomocTarget(&target);
+          automoc.InitializeMocSourceFile(&target);
+          automocs.push_back(std::make_pair(automoc, &target));
           }
         }
       }
     }
+  for (Automocs::iterator it = automocs.begin(); it != automocs.end();
+       ++it)
+    {
+    it->first.SetupAutomocTarget(it->second);
+    }
 #endif
 }
 
diff --git a/Source/cmQtAutomoc.cxx b/Source/cmQtAutomoc.cxx
index 4818f1bd54..10ce6416de 100644
--- a/Source/cmQtAutomoc.cxx
+++ b/Source/cmQtAutomoc.cxx
@@ -119,6 +119,22 @@ cmQtAutomoc::cmQtAutomoc()
     }
 }
 
+void cmQtAutomoc::InitializeMocSourceFile(cmTarget* target)
+{
+  std::string automocTargetName = target->GetName();
+  cmMakefile *makefile = target->GetMakefile();
+  automocTargetName += "_automoc";
+  std::string mocCppFile = makefile->GetCurrentOutputDirectory();
+  mocCppFile += "/";
+  mocCppFile += automocTargetName;
+  mocCppFile += ".cpp";
+  cmSourceFile* mocCppSource = makefile->GetOrCreateSource(mocCppFile.c_str(),
+                                                         true);
+  makefile->AppendProperty("ADDITIONAL_MAKE_CLEAN_FILES",
+                           mocCppFile.c_str(), false);
+
+  target->AddSourceFile(mocCppSource);
+}
 
 void cmQtAutomoc::SetupAutomocTarget(cmTarget* target)
 {
@@ -268,17 +284,6 @@ void cmQtAutomoc::SetupAutomocTarget(cmTarget* target)
   outputFile += "/AutomocInfo.cmake";
   makefile->ConfigureFile(inputFile.c_str(), outputFile.c_str(),
                           false, true, false);
-
-  std::string mocCppFile =  makefile->GetCurrentOutputDirectory();
-  mocCppFile += "/";
-  mocCppFile += automocTargetName;
-  mocCppFile += ".cpp";
-  cmSourceFile* mocCppSource = makefile->GetOrCreateSource(mocCppFile.c_str(),
-                                                         true);
-  target->AddSourceFile(mocCppSource);
-
-  makefile->AppendProperty("ADDITIONAL_MAKE_CLEAN_FILES",
-                           mocCppFile.c_str(), false);
 }
 
 
diff --git a/Source/cmQtAutomoc.h b/Source/cmQtAutomoc.h
index 69da80e4f8..962e25496a 100644
--- a/Source/cmQtAutomoc.h
+++ b/Source/cmQtAutomoc.h
@@ -23,6 +23,7 @@ public:
   cmQtAutomoc();
   bool Run(const char* targetDirectory);
 
+  void InitializeMocSourceFile(cmTarget* target);
   void SetupAutomocTarget(cmTarget* target);
 
 private:
diff --git a/Tests/QtAutomoc/CMakeLists.txt b/Tests/QtAutomoc/CMakeLists.txt
index 530818e9ca..ebfbb03633 100644
--- a/Tests/QtAutomoc/CMakeLists.txt
+++ b/Tests/QtAutomoc/CMakeLists.txt
@@ -38,3 +38,9 @@ generate_export_header(libC)
 target_link_libraries(libC LINK_PUBLIC libB)
 
 target_link_libraries(foo codeeditorLib ${QT_LIBRARIES} libC)
+
+add_library(empty STATIC empty.cpp)
+set_target_properties(empty PROPERTIES AUTOMOC TRUE)
+target_link_libraries(empty no_link_language)
+add_library(no_link_language STATIC empty.h)
+set_target_properties(no_link_language PROPERTIES AUTOMOC TRUE)
diff --git a/Tests/QtAutomoc/empty.cpp b/Tests/QtAutomoc/empty.cpp
new file mode 100644
index 0000000000..ab32cf6c8a
--- /dev/null
+++ b/Tests/QtAutomoc/empty.cpp
@@ -0,0 +1 @@
+// No content
diff --git a/Tests/QtAutomoc/empty.h b/Tests/QtAutomoc/empty.h
new file mode 100644
index 0000000000..4566142c14
--- /dev/null
+++ b/Tests/QtAutomoc/empty.h
@@ -0,0 +1,9 @@
+
+#include <QObject>
+
+class Empty : public QObject
+{
+  Q_OBJECT
+public:
+  explicit Empty(QObject *parent = 0) {}
+};