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, 30 insertions, 3 deletions

diff --git a/Source/cmInstallCommand.cxx b/Source/cmInstallCommand.cxx
index dcd418b..d3a8037 100644
--- a/Source/cmInstallCommand.cxx
+++ b/Source/cmInstallCommand.cxx
@@ -1196,6 +1196,8 @@ bool cmInstallCommand::HandleExportMode(std::vector<std::string> const& args)
   cmInstallCommandArguments ica(this->DefaultComponentName);
   cmCAString exp(&ica.Parser, "EXPORT");
   cmCAString name_space(&ica.Parser, "NAMESPACE", &ica.ArgumentGroup);
+  cmCAEnabler exportOld(&ica.Parser, "EXPORT_LINK_INTERFACE_LIBRARIES",
+                        &ica.ArgumentGroup);
   cmCAString filename(&ica.Parser, "FILE", &ica.ArgumentGroup);
   exp.Follows(0);
 
@@ -1268,15 +1270,40 @@ bool cmInstallCommand::HandleExportMode(std::vector<std::string> const& args)
       }
     }
 
+  cmExportSet *exportSet = this->Makefile->GetLocalGenerator()
+                    ->GetGlobalGenerator()->GetExportSets()[exp.GetString()];
+  if (exportOld.IsEnabled())
+    {
+    for(std::vector<cmTargetExport*>::const_iterator
+          tei = exportSet->GetTargetExports()->begin();
+        tei != exportSet->GetTargetExports()->end(); ++tei)
+      {
+      cmTargetExport const* te = *tei;
+      const bool newCMP0022Behavior =
+                      te->Target->GetPolicyStatusCMP0022() != cmPolicies::WARN
+                   && te->Target->GetPolicyStatusCMP0022() != cmPolicies::OLD;
+
+      if(!newCMP0022Behavior)
+        {
+        cmOStringStream e;
+        e << "INSTALL(EXPORT) given keyword \""
+          << "EXPORT_LINK_INTERFACE_LIBRARIES" << "\", but target \""
+          << te->Target->GetName()
+          << "\" does not have policy CMP0022 set to NEW.";
+        this->SetError(e.str().c_str());
+        return false;
+        }
+      }
+    }
+
   // Create the export install generator.
   cmInstallExportGenerator* exportGenerator =
     new cmInstallExportGenerator(
-      this->Makefile->GetLocalGenerator()
-          ->GetGlobalGenerator()->GetExportSets()[exp.GetString()],
+      exportSet,
       ica.GetDestination().c_str(),
       ica.GetPermissions().c_str(), ica.GetConfigurations(),
       ica.GetComponent().c_str(), fname.c_str(),
-      name_space.GetCString(), this->Makefile);
+      name_space.GetCString(), exportOld.IsEnabled(), this->Makefile);
   this->Makefile->AddInstallGenerator(exportGenerator);
 
   return true;