How do I use the new repository code?
=====================================

   Because there is some disagreement about the details of the template
repository mechanism, you'll need to obtain a patch from Cygnus Support
to enable the 2.7.2 repository code.  You can obtain the patch by
anonymous FTP: `ftp://ftp.cygnus.com/pub/g++/gcc-2.7.2-repo.gz'.

   There are patches for 2.7.0 and 2.7.1 in the same directory, though
if you're going to rebuild the compiler you should use the latest one.

   If you're running NetBSD or BSDI, the Cygnus repo patch is not quite
correct.  Tim Liddelow has made an alternate version available at
`ftp://ftp.cst.com.au/pub/gcc-2.7.2-repo-bsd.gz'.

   After you've applied the patch, the `-frepo' flag will enable the
repository mechanism.  The flag works much like the existing
`-fno-implicit-templates' flag, except that auxiliary files, with an
`.rpo' extension, are built that specify what template expansions are
needed.  At link time, the (patched) collect program detects missing
templates and recompiles some of the object files so that the required
templates are expanded.

   Note that the mechanism differs from that of cfront in that template
definitions still must be visible at the point where they are to be
expanded.  No assumption is made that `foo.C' contains template
definitions corresponding to template declarations in `foo.h'.

   Jason Merrill writes: "To perform closure on a set of objects, just
try to link them together.  It will fail, but as a side effect all
needed instances will be generated in the objects."