ENH: Add UNKNOWN type for IMPORTED libraries

When creating an IMPORTED target for a library that has been found on
disk, it may not be known whether the library is STATIC or SHARED.
However, the library may still be linked using the file found from disk.
Use of an IMPORTED target is still important to allow per-configuration
files to be specified for the library.

This change creates an UNKNOWN type for IMPORTED library targets.  The
IMPORTED_LOCATION property (and its per-config equivalents) specifies
the location of the library.  CMake makes no assumptions about the
library that cannot be inferred from the file on disk.  This will help
projects and find-modules import targets found on disk or specified by
the user.

1 files changed, 16 insertions, 0 deletions

diff --git a/Source/cmAddLibraryCommand.cxx b/Source/cmAddLibraryCommand.cxx
index 575dd04..2bc65ce 100644
--- a/Source/cmAddLibraryCommand.cxx
+++ b/Source/cmAddLibraryCommand.cxx
@@ -68,6 +68,12 @@ bool cmAddLibraryCommand
       type = cmTarget::MODULE_LIBRARY;
       haveSpecifiedType = true;
       }
+    else if(libType == "UNKNOWN")
+      {
+      ++s;
+      type = cmTarget::UNKNOWN_LIBRARY;
+      haveSpecifiedType = true;
+      }
     else if(*s == "EXCLUDE_FROM_ALL")
       {
       ++s;
@@ -127,6 +133,16 @@ bool cmAddLibraryCommand
     return true;
     }
 
+  // A non-imported target may not have UNKNOWN type.
+  if(type == cmTarget::UNKNOWN_LIBRARY)
+    {
+    this->Makefile->IssueMessage(
+      cmake::FATAL_ERROR,
+      "The UNKNOWN library type may be used only for IMPORTED libraries."
+      );
+    return true;
+    }
+
   // Enforce name uniqueness.
   {
   std::string msg;