Add support for Visual Studio project-specific globals (#8707)

Thanks to Pau Garcia i Quiles for the inspiration for the patch.
I've tweaked it a bit compared to what's in the bug tracker: this
commit does not allow empty global variable names.

I also added usage of the new feature to an existing test. Although
it has no effect on the resulting Visual Studio projects, you can
verify that the VSResource test produces a non-empty globals section
in the generated .vcproj(x) files.

4 files changed, 35 insertions, 5 deletions

diff --git a/Source/cmLocalVisualStudio7Generator.cxx b/Source/cmLocalVisualStudio7Generator.cxx
index 7a62b9c..3e76f59 100644
--- a/Source/cmLocalVisualStudio7Generator.cxx
+++ b/Source/cmLocalVisualStudio7Generator.cxx
@@ -1279,7 +1279,7 @@ void cmLocalVisualStudio7Generator::WriteVCProjFile(std::ostream& fout,
   fout << "\t</Files>\n";
 
   // Write the VCProj file's footer.
-  this->WriteVCProjFooter(fout);
+  this->WriteVCProjFooter(fout, target);
 }
 
 struct cmLVS7GFileConfig
@@ -1880,10 +1880,28 @@ cmLocalVisualStudio7Generator::WriteProjectStart(std::ostream& fout,
 }
 
 
-void cmLocalVisualStudio7Generator::WriteVCProjFooter(std::ostream& fout)
+void cmLocalVisualStudio7Generator::WriteVCProjFooter(std::ostream& fout,
+                                                      cmTarget &target)
 {
-  fout << "\t<Globals>\n"
-       << "\t</Globals>\n"
+  fout << "\t<Globals>\n";
+
+  cmPropertyMap const& props = target.GetProperties();
+  for(cmPropertyMap::const_iterator i = props.begin(); i != props.end(); ++i)
+    {
+    if(i->first.find("VS_GLOBAL_") == 0)
+      {
+      std::string name = i->first.substr(10);
+      if(name != "")
+        {
+        fout << "\t\t<Global\n"
+             << "\t\t\tName=\"" << name << "\"\n"
+             << "\t\t\tValue=\"" << i->second.GetValue() << "\"\n"
+             << "\t\t/>\n";
+        }
+      }
+    }
+
+  fout << "\t</Globals>\n"
        << "</VisualStudioProject>\n";
 }
 
diff --git a/Source/cmLocalVisualStudio7Generator.h b/Source/cmLocalVisualStudio7Generator.h
index 160e2d4..4fdbc58 100644
--- a/Source/cmLocalVisualStudio7Generator.h
+++ b/Source/cmLocalVisualStudio7Generator.h
@@ -84,7 +84,7 @@ private:
   void WriteProjectFiles();
   void WriteVCProjHeader(std::ostream& fout, const char *libName,
                          cmTarget &tgt, std::vector<cmSourceGroup> &sgs);
-  void WriteVCProjFooter(std::ostream& fout);
+  void WriteVCProjFooter(std::ostream& fout, cmTarget &target);
   void CreateSingleVCProj(const char *lname, cmTarget &tgt);
   void WriteVCProjFile(std::ostream& fout, const char *libName, 
                        cmTarget &tgt);
diff --git a/Source/cmSetTargetPropertiesCommand.h b/Source/cmSetTargetPropertiesCommand.h
index 9e39401..feead00 100644
--- a/Source/cmSetTargetPropertiesCommand.h
+++ b/Source/cmSetTargetPropertiesCommand.h
@@ -143,6 +143,10 @@ public:
         "VS_SCC_PROJECTNAME, VS_SCC_LOCALPATH, VS_SCC_PROVIDER can be set "
         "to add support for source control bindings in a  Visual Studio "
         "project file.\n"
+        "VS_GLOBAL_<variable> can be set to add a Visual Studio "
+        "project-specific global variable. "
+        "Qt integration works better if VS_GLOBAL_QtVersion is set to "
+        "the Qt version FindQt4.cmake found. For example, \"4.7.3\"\n"
         "The PRE_INSTALL_SCRIPT and POST_INSTALL_SCRIPT properties are the "
         "old way to specify CMake scripts to run before and after "
         "installing a target.  They are used only when the old "
diff --git a/Source/cmTarget.cxx b/Source/cmTarget.cxx
index e10ba4a..17a26cc 100644
--- a/Source/cmTarget.cxx
+++ b/Source/cmTarget.cxx
@@ -960,6 +960,14 @@ void cmTarget::DefineProperties(cmake *cm)
      "Visual Studio Source Code Control Project.",
      "Can be set to change the visual studio source code control "
      "project name property.");
+  cm->DefineProperty
+    ("VS_GLOBAL_<variable>", cmProperty::TARGET,
+     "Visual Studio project-specific global variable.",
+     "Tell the Visual Studio generator to set the global variable "
+     "'<variable>' to a given value in the generated Visual Studio "
+     "project. Ignored on other generators. Qt integration works "
+     "better if VS_GLOBAL_QtVersion is set to the version "
+     "FindQt4.cmake found. For example, \"4.7.3\"");
 
 #if 0
   cm->DefineProperty