Export: Generate INTERFACE_LINK_LIBRARIES property on targets.

This property is generated only for targets which have recorded
policy CMP0022 as NEW, and a compatibility mode is added to
additionally export the old interfaces in that case too.

If the old interfaces are not exported, the generated export files
require CMake 2.8.12. Because the unit tests use a version which
is not yet called 2.8.12, temporarily require a lower version.

1 files changed, 6 insertions, 1 deletions

diff --git a/Source/cmExportCommand.h b/Source/cmExportCommand.h
index ae67b47..87c3452 100644
--- a/Source/cmExportCommand.h
+++ b/Source/cmExportCommand.h
@@ -63,7 +63,7 @@ public:
     {
     return
       "  export(TARGETS [target1 [target2 [...]]] [NAMESPACE <namespace>]\n"
-      "         [APPEND] FILE <filename>)\n"
+      "         [APPEND] FILE <filename> [EXPORT_LINK_INTERFACE_LIBRARIES])\n"
       "Create a file <filename> that may be included by outside projects to "
       "import targets from the current project's build tree.  "
       "This is useful during cross-compiling to build utility executables "
@@ -73,6 +73,10 @@ public:
       "prepended to all target names written to the file.  "
       "If the APPEND option is given the generated code will be appended "
       "to the file instead of overwriting it.  "
+      "The EXPORT_LINK_INTERFACE_LIBRARIES keyword, if present, causes the "
+      "contents of the properties matching "
+      "(IMPORTED_)?LINK_INTERFACE_LIBRARIES(_<CONFIG>)? to be exported, when "
+      "policy CMP0022 is NEW.  "
       "If a library target is included in the export but "
       "a target to which it links is not included the behavior is "
       "unspecified."
@@ -104,6 +108,7 @@ private:
   cmCAEnabler Append;
   cmCAString Namespace;
   cmCAString Filename;
+  cmCAEnabler ExportOld;
 
   friend class cmExportBuildFileGenerator;
   std::string ErrorMessage;