From 51988a4f91c6c6a4b91eedfb5010fdbc57b71891 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Fri, 4 Jan 2013 09:38:22 -0500
Subject: [PATCH] add_library: Document object library portability suggestion

Xcode and VS <= 7.1 will not build targets that have no source files
besides $<TARGET_OBJECTS:...>.  Suggest in the documentation that
projects always add at least one real source file.
---
 Source/cmAddLibraryCommand.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Source/cmAddLibraryCommand.h b/Source/cmAddLibraryCommand.h
index c14456535..e5f27cb51 100644
--- a/Source/cmAddLibraryCommand.h
+++ b/Source/cmAddLibraryCommand.h
@@ -134,6 +134,10 @@ public:
       "They may contain custom commands generating such sources, but not "
       "PRE_BUILD, PRE_LINK, or POST_BUILD commands.  "
       "Object libraries cannot be imported, exported, installed, or linked."
+      "  "
+      "Some native build systems may not like targets that have only "
+      "object files, so consider adding at least one real source file "
+      "to any target that references $<TARGET_OBJECTS:objlib>."
       ;
     }