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Re: [PATCH v3 2/3] qapi: Do not generate empty enum
From: |
Markus Armbruster |
Subject: |
Re: [PATCH v3 2/3] qapi: Do not generate empty enum |
Date: |
Thu, 16 Mar 2023 13:31:04 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Philippe Mathieu-Daudé <philmd@linaro.org> writes:
> Per the C++ standard, empty enum are ill-formed. Do not generate
> them in order to avoid:
>
> In file included from qga/qga-qapi-emit-events.c:14:
> qga/qga-qapi-emit-events.h:20:1: error: empty enum is invalid
> 20 | } qga_QAPIEvent;
> | ^
>
> Reported-by: Markus Armbruster <armbru@redhat.com>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Two failures in "make check-qapi-schema" (which is run by "make check"):
1. Positive test case qapi-schema-test
--- /work/armbru/qemu/bld-x86/../tests/qapi-schema/qapi-schema-test.out
+++
@@ -19,7 +19,6 @@
member enum2: EnumOne optional=True
member enum3: EnumOne optional=False
member enum4: EnumOne optional=True
-enum MyEnum
object Empty1
object Empty2
base Empty1
You forgot to update expected test output. No big deal.
2. Negative test case union-empty
--- /work/armbru/qemu/bld-x86/../tests/qapi-schema/union-empty.err
+++
@@ -1,2 +1,2 @@
-union-empty.json: In union 'Union':
-union-empty.json:4: union has no branches
+union-empty.json: In struct 'Base':
+union-empty.json:3: member 'type' uses unknown type 'Empty'
stderr:
qapi-schema-test FAIL
union-empty FAIL
The error message regresses.
I can see two ways to fix this:
(A) You can't just drop empty enumeration types on the floor. To not
generate code for them, you need to skip them wherever we
generate code for enumeration types.
(B) Outlaw empty enumeration types.
I recommend to give (B) a try, it's likely simpler.
- [PATCH v3 0/3] qapi: Simplify enum generation, Philippe Mathieu-Daudé, 2023/03/15
- [PATCH v3 1/3] scripts/git.orderfile: Display QAPI script changes before schema ones, Philippe Mathieu-Daudé, 2023/03/15
- [PATCH v3 2/3] qapi: Do not generate empty enum, Philippe Mathieu-Daudé, 2023/03/15
- Re: [PATCH v3 2/3] qapi: Do not generate empty enum, Richard Henderson, 2023/03/15
- Re: [PATCH v3 2/3] qapi: Do not generate empty enum,
Markus Armbruster <=
- Re: [PATCH v3 2/3] qapi: Do not generate empty enum, Markus Armbruster, 2023/03/16
- Re: [PATCH v3 2/3] qapi: Do not generate empty enum, Philippe Mathieu-Daudé, 2023/03/21
- Re: [PATCH v3 2/3] qapi: Do not generate empty enum, Daniel P . Berrangé, 2023/03/21
- Re: [PATCH v3 2/3] qapi: Do not generate empty enum, Eric Blake, 2023/03/21
- Re: [PATCH v3 2/3] qapi: Do not generate empty enum, Markus Armbruster, 2023/03/22
- Re: [PATCH v3 2/3] qapi: Do not generate empty enum, Philippe Mathieu-Daudé, 2023/03/21
- Re: [PATCH v3 2/3] qapi: Do not generate empty enum, Markus Armbruster, 2023/03/21