Disable SHARED_LIB_STAGING_DIR usage on systems where it's not initialized.

indra/llcommon/CMakeLists.txt

@@ -238,10 +238,13 @@ list(APPEND llcommon_SOURCE_FILES ${llcommon_HEADER_FILES})
 if(LLCOMMON_LINK_SHARED)
     add_library (llcommon SHARED ${llcommon_SOURCE_FILES})
     add_definitions(-DLL_COMMON_BUILD=1)
-    # *FIX:Mani ---
-    # llcommon.dll get written to the DLL staging directory.
-    # Also this directory is shared with RunBuildTest.cmake, y'know, for the tests.
-    set_target_properties(llcommon PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${SHARED_LIB_STAGING_DIR})
+
+    if(SHARED_LIB_STAGING_DIR)
+        # *FIX:Mani ---
+        # llcommon.dll get written to the DLL staging directory.
+        # Also this directory is shared with RunBuildTest.cmake, y'know, for the tests.
+        set_target_properties(llcommon PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${SHARED_LIB_STAGING_DIR})
+    endif(SHARED_LIB_STAGING_DIR)
 else(LLCOMMON_LINK_SHARED)
     add_library (llcommon ${llcommon_SOURCE_FILES})
 endif(LLCOMMON_LINK_SHARED)