Include less of the generated modular QAPI headers

In my "build everything" tree, a change to the types in
qapi-schema.json triggers a recompile of about 4800 out of 5100
objects.

The previous commit split up qmp-commands.h, qmp-event.h, qmp-visit.h,
qapi-types.h.  Each of these headers still includes all its shards.
Reduce compile time by including just the shards we actually need.

To illustrate the benefits: adding a type to qapi/migration.json now
recompiles some 2300 instead of 4800 objects.  The next commit will
improve it further.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180211093607.27351-24-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
[eblake: rebase to master]
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/scripts/qapi/visit.py b/scripts/qapi/visit.py
index 9b678e7263..de09966643 100644
--- a/scripts/qapi/visit.py
+++ b/scripts/qapi/visit.py
@@ -284,20 +284,22 @@ class QAPISchemaGenVisitVisitor(QAPISchemaModularCVisitor):
                                       prefix=prefix))
 
     def _begin_module(self, name):
+        types = self._module_basename('qapi-types', name)
+        visit = self._module_basename('qapi-visit', name)
         self._genc.preamble_add(mcgen('''
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qapi/error.h"
 #include "qapi/qmp/qerror.h"
-#include "%(prefix)sqapi-visit.h"
+#include "%(visit)s.h"
 ''',
-                                      prefix=self._prefix))
+                                      visit=visit, prefix=self._prefix))
         self._genh.preamble_add(mcgen('''
 #include "qapi-builtin-visit.h"
-#include "%(prefix)sqapi-types.h"
+#include "%(types)s.h"
 
 ''',
-                                      prefix=self._prefix))
+                                      types=types))
 
     def visit_enum_type(self, name, info, values, prefix):
         self._genh.add(gen_visit_decl(name, scalar=True))