Add a way to exclude INTERFACE properties from exported targets.

Projects set interface requirements upstream, and existing
downstreams use of target_link_libraries will consume those interfaces.

This can create a backward compatibility concern as the result may
be changing the order of include directories of downstreams, or another
side-effect of using the INTERFACE properties.

Provide a way for them to emulate the behavior of a version-based
policy in the config file.

1 files changed, 4 insertions, 3 deletions

diff --git a/Source/cmExportFileGenerator.cxx b/Source/cmExportFileGenerator.cxx
index e772327..2ecac84 100644
--- a/Source/cmExportFileGenerator.cxx
+++ b/Source/cmExportFileGenerator.cxx
@@ -264,15 +264,16 @@ void cmExportFileGenerator::GenerateInterfaceProperties(cmTarget *target,
 {
   if (!properties.empty())
     {
+    os << "if(NOT ${CMAKE_FIND_PACKAGE_NAME}_NO_INTERFACES)\n";
     std::string targetName = this->Namespace;
     targetName += target->GetName();
-    os << "set_target_properties(" << targetName << " PROPERTIES\n";
+    os << "  set_target_properties(" << targetName << " PROPERTIES\n";
     for(ImportPropertyMap::const_iterator pi = properties.begin();
         pi != properties.end(); ++pi)
       {
-      os << "  " << pi->first << " \"" << pi->second << "\"\n";
+      os << "    " << pi->first << " \"" << pi->second << "\"\n";
       }
-    os << ")\n\n";
+    os << "  )\nendif()\n\n";
     }
 }