Do not export INTERFACE_LINK_LIBRARIES from non-linkable targets

When cmExportFileGenerator::SetImportLinkInterface exports the old
LINK_INTERFACE_LIBRARIES property values it skips doing so for
non-linkable targets because target->GetLinkInterface returns NULL for
such targets.

Since cmExportFileGenerator::PopulateInterfaceLinkLibrariesProperty
looks at the INTERFACE_LINK_LIBRARIES property directly instead of using
the computed link interface, teach it to skip exporting the property if
target->IsLinkable returns false.

Extend the RunCMake.CMP0022 test with a case covering this.  Simply
export an executable target that links to a library that is not
exported.

1 files changed, 4 insertions, 0 deletions

diff --git a/Source/cmExportFileGenerator.cxx b/Source/cmExportFileGenerator.cxx
index a30c5e4..14be5cd 100644
--- a/Source/cmExportFileGenerator.cxx
+++ b/Source/cmExportFileGenerator.cxx
@@ -185,6 +185,10 @@ bool cmExportFileGenerator::PopulateInterfaceLinkLibrariesProperty(
                       ImportPropertyMap &properties,
                       std::vector<std::string> &missingTargets)
 {
+  if(!target->IsLinkable())
+    {
+    return false;
+    }
   const char *input = target->GetProperty("INTERFACE_LINK_LIBRARIES");
   if (input)
     {