invoke.texi (Precompiled Headers): Warn about known problems.

	* doc/invoke.texi (Precompiled Headers): Warn about known
	problems.

From-SVN: r80529

gcc/ChangeLog

+2004-04-08  Mark Mitchell  <mark@codesourcery.com>
+
+	* doc/invoke.texi (Precompiled Headers): Warn about known
+	problems.
+
 2004-04-08  Danny Smith  <dannysmith@users.sourceforge.net>
 
 	PR c++/14808

gcc/doc/invoke.texi

@@ -11336,6 +11336,13 @@ build the project.  To make builds faster, GCC allows users to
 `precompile' a header file; then, if builds can use the precompiled
 header file they will be much faster.
 
+@strong{Caution:} There are a few known situations where GCC will
+crash when trying to use a precompiled header.  If you have trouble
+with a precompiled header, you should remove the precompiled header
+and compile without it.  In addition, please use GCC's on-line
+defect-tracking system to report any problems you encounter with
+precompiled headers.  @xref{Bugs}.
+
 To create a precompiled header file, simply compile it as you would any
 other file, if necessary using the @option{-x} option to make the driver
 treat it as a C or C++ header file.  You will probably want to use a