Don't add invalid content to static lib INTERFACE_LINK_LIBRARIES.

Only valid target names or generator expressions may appear in
the target field of a LINK_ONLY expression.

Other content like link flags should still be added to that property
(wrapped in config-specific generator expressions), but not wrapped
in LINK_ONLY. Otherwise undue warnings would be issued for the
policy CMP0022.

The LINK_ONLY expression only has an effect for actual target
names anyway, so there is no logical deficit.

1 files changed, 8 insertions, 3 deletions

diff --git a/Source/cmTargetLinkLibrariesCommand.cxx b/Source/cmTargetLinkLibrariesCommand.cxx
index 863b391..6030a44 100644
--- a/Source/cmTargetLinkLibrariesCommand.cxx
+++ b/Source/cmTargetLinkLibrariesCommand.cxx
@@ -384,10 +384,15 @@ cmTargetLinkLibrariesCommand::HandleLibrary(const char* lib,
       {
       if (this->Target->GetType() == cmTarget::STATIC_LIBRARY)
         {
+        std::string configLib = this->Target
+                                     ->GetDebugGeneratorExpressions(lib, llt);
+        if (cmGeneratorExpression::IsValidTargetName(lib)
+            || cmGeneratorExpression::Find(lib) != std::string::npos)
+          {
+          configLib = "$<LINK_ONLY:" + configLib + ">";
+          }
         this->Target->AppendProperty("INTERFACE_LINK_LIBRARIES",
-                  ("$<LINK_ONLY:" +
-                  this->Target->GetDebugGeneratorExpressions(lib, llt) +
-                  ">").c_str());
+                                     configLib.c_str());
         }
       // Not a 'public' or 'interface' library. Do not add to interface
       // property.