On 02/11/2018 03:35 AM, Markus Armbruster wrote:
Linking code from multiple separate QAPI schemata into the same
program is possible, but involves some weirdness around built-in

* We generate code for built-in types into .c only with option
   --builtins.  The user is responsible for generating code for exactly
   one QAPI schema per program with --builtins.

* We generate code for built-in types into .h regardless of
   --builtins, but guarded by #ifndef QAPI_VISIT_BUILTIN.  Because all
   copies of this code are exactly the same, including any combination
   of these headers works.

Replace this contraption by something more conventional: generate code
for built-in types into their very own files: qapi-builtin-types.c,
qapi-builtin-visit.c, qapi-builtin-types.h, qapi-builtin-visit.h, but
only with --builtins.  Obey --output-dir, but ignore --prefix for

Make qapi-types.h include qapi-builtin-types.h.  With multiple
schemata you now have multiple qapi-types.[ch], but only one
qapi-builtin-types.[ch].  Same for qapi-visit.[ch] and

Bonus: if all you need is built-in stuff, you can include a much
smaller header.  To be exploited shortly.

Signed-off-by: Markus Armbruster <arm...@redhat.com>
@@ -2046,6 +2046,7 @@ class QAPIGenH(QAPIGenC):
class QAPIGenDoc(QAPIGen):
      def _top(self, fname):
          return (QAPIGen._top(self, fname)
                  + '@c AUTOMATICALLY GENERATED, DO NOT MODIFY\n\n')

Does this hunk belong in an earlier patch?

Reviewed-by: Eric Blake <ebl...@redhat.com>

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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