Markus Armbruster 907b846653 qapi: Touch generated files only when they change ...

A massive number of objects depends on QAPI-generated headers.  In my
"build everything" tree, it's roughly 4800 out of 5100.  This is
particularly annoying when only some of the generated files change,
say for a doc fix.

Improve qapi-gen.py to touch its output files only if they actually
change.  Rebuild time for a QAPI doc fix drops from many minutes to a
few seconds.  Rebuilds get faster for certain code changes, too.  For
instance, adding a simple QMP event now recompiles less than 200
instead of 4800 objects.  But adding a QAPI type is as bad as ever;
we've clearly got more work to do.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180211093607.27351-11-armbru@redhat.com>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
[eblake: fix octal constant for python3]
Signed-off-by: Eric Blake <eblake@redhat.com>

2018-03-02 13:14:09 -06:00

..

__init__.py

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commands.py

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common.py

qapi: Touch generated files only when they change

2018-03-02 13:14:09 -06:00

doc.py

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events.py

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introspect.py

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types.py

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visit.py

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