Add FOLDER target property, for IDEs (#3796)

This work was started from a patch by Thomas Schiffer.
Thanks, Thomas!

See the newly added documentation of the FOLDER target
property for details.

Also added global properties, USE_FOLDERS and
PREDEFINED_TARGETS_FOLDER. See new docs here, too.

By default, the FOLDER target property is used to organize
targets into folders in IDEs that have support for such
organization.

This commit adds "solution folder" support to the Visual
Studio generators. Currently works with versions 7 through
10.

Also, use the new FOLDER property in the ExternalProject
test and in the CMake project itself.

1 files changed, 4 insertions, 0 deletions

diff --git a/Source/cmGlobalVisualStudio7Generator.h b/Source/cmGlobalVisualStudio7Generator.h
index 85ba244..b2c7141 100644
--- a/Source/cmGlobalVisualStudio7Generator.h
+++ b/Source/cmGlobalVisualStudio7Generator.h
@@ -142,6 +142,10 @@ protected:
   std::vector<std::string> Configurations;
   std::map<cmStdString, cmStdString> GUIDMap;
 
+  virtual void WriteFolders(std::ostream& fout);
+  virtual void WriteFoldersContent(std::ostream& fout);
+  std::map<std::string,std::set<std::string> > VisualStudioFolders;
+
   // Set during OutputSLNFile with the name of the current project.
   // There is one SLN file per project.
   std::string CurrentProject;