INTERFACE_LIBRARY: Avoid codepaths which set unneeded properties.

As an INTERFACE_LIBRARY has no direct link dependencies, we can
short-circuit in cmGeneratorExpressionEvaluator and
in cmGlobalGenerator::CheckLocalGenerators.

As they do not generate any output directly, any generate- or install-
related code acn also be short-circuited. Many of the local generators
already do this.

Because only INTERFACE related properties make sense on INTERFACE_LIBRARY
targets, avoid setting other properties, for example via defaults.

1 files changed, 6 insertions, 3 deletions

diff --git a/Source/cmMakefileLibraryTargetGenerator.cxx b/Source/cmMakefileLibraryTargetGenerator.cxx
index 7b8a53150c..35818ee13b 100644
--- a/Source/cmMakefileLibraryTargetGenerator.cxx
+++ b/Source/cmMakefileLibraryTargetGenerator.cxx
@@ -25,9 +25,12 @@ cmMakefileLibraryTargetGenerator
   cmMakefileTargetGenerator(target->Target)
 {
   this->CustomCommandDriver = OnDepends;
-  this->Target->GetLibraryNames(
-    this->TargetNameOut, this->TargetNameSO, this->TargetNameReal,
-    this->TargetNameImport, this->TargetNamePDB, this->ConfigName);
+  if (this->Target->GetType() != cmTarget::INTERFACE_LIBRARY)
+    {
+    this->Target->GetLibraryNames(
+      this->TargetNameOut, this->TargetNameSO, this->TargetNameReal,
+      this->TargetNameImport, this->TargetNamePDB, this->ConfigName);
+    }
 
   this->OSXBundleGenerator = new cmOSXBundleGenerator(target,
                                                       this->ConfigName);