[Bug pch/49579] New: Document how to use PCH with Automake

[olafvdspek at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49579

           Summary: Document how to use PCH with Automake
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: pch
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: olafvds...@gmail.com


PCH is a useful feature, but using it with automake isn't trivial. Could you
document how to use it?