Eric Blake 907771516e qapi: Forbid empty unions and useless alternates ... Empty unions serve no purpose, and while we compile with gcc which permits them, strict C99 forbids them. We happen to inject a dummy 'void *data' member into the C unions that represent QAPI unions and alternates, but we want to get rid of that member (it pollutes the namespace for no good reason), which would leave us with an empty union if the user didn't provide any branches. While empty structs make sense in QAPI, empty unions don't add any expressiveness to the QMP language. So prohibit them at parse time. Update the documentation and testsuite to match. Note that the documentation already mentioned that alternates should have "two or more JSON data types"; so this also fixes the code to enforce that. However, we have existing uses of a union type with only one branch, so the 2-or-more strictness is intentionally limited to alternates. Backports commit 02a57ae32b08e8981b59979b80e682c9a153e94d from qemu		2018-02-20 15:46:08 -05:00
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create_config	more cleanup qemu/configure	2017-01-19 14:11:54 +08:00
make_device_config.sh	fix file perms	2015-08-28 21:05:38 -07:00
ordereddict.py	import	2015-08-21 15:04:50 +08:00
qapi-event.py	qapi: Drop unused 'kind' for struct/enum visit	2018-02-19 23:43:54 -05:00
qapi-types.py	qapi: Swap visit_* arguments for consistent 'name' placement	2018-02-19 22:45:07 -05:00
qapi-visit.py	qapi-visit: Honor prefix of discriminator enum	2018-02-20 15:38:44 -05:00
qapi.py	qapi: Forbid empty unions and useless alternates	2018-02-20 15:46:08 -05:00