Clarify that later compiler versions are known to
fail to build the Ada front-end.

llvm-svn: 74793
diff --git a/llvm/docs/GCCFEBuildInstrs.html b/llvm/docs/GCCFEBuildInstrs.html
index 262c167..b675ee7 100644
--- a/llvm/docs/GCCFEBuildInstrs.html
+++ b/llvm/docs/GCCFEBuildInstrs.html
@@ -88,6 +88,7 @@
       are <a href="http://gcc.gnu.org/releases.html">gcc-4.2</a> and the
       2005, 2006 and 2007 versions of the
       <a href="http://libre.adacore.com/">GNAT GPL Edition</a>.
+      <b>GNAT GPL 2008, gcc-4.3 and later will not work</b>.
       The LLVM parts of llvm-gcc are written in C++ so a C++ compiler is
       needed to build them.  The rest of gcc is written in C.
       Some linux distributions provide a version of gcc that supports all