Matthijs van Duin
654eaa4030
When two fields were added to the vtable.x.start struct, no initializers
for these were added to SD_BUS_VTABLE_END which also (ab)used that
struct (albeit sneakily by using non-designated initialization).
While C tolerates this, C++ prohibits these missing initializers, and
both g++ and clang++ will complain when using -Wextra.
This patch gives SD_BUS_VTABLE_END its own case in the union and
clarifies its initialization.
I tested the behaviour of g++ 10.2 and clang 11 in various cases. Both will warn
(-Wmissing-field-initializers, implied by -Wextra) if you provide initializers for some
but not all fields of a struct. Declaring x.end as empty struct or using an empty initializer
{} to initialize the union or one of its members is valid C++ but not C, although both gcc
and clang accept it without warning (even at -Wall -Wextra -std=c90/c++11) unless you
use -pedantic (which requires -std=c99/c++2a to support designated initializers).
Interestingly, .x = { .start = { 0, 0, NULL } } is the only initializer I found for the union
(among candidates for SD_BUS_VTABLE_END) where gcc doesn't zero-fill it entirely
when allocated on stack, it looked like it did in all other cases (I only examined this on
32-bit arm). clang always seems to initialize all bytes of the union.
[zjs: test case:
$ cat vtable-test.cc
#include "sd-bus.h"
const sd_bus_vtable vtable[] = {
SD_BUS_VTABLE_END
};
$ g++ -I src/systemd/ -Wall -Wmissing-field-initializers -c vtable-test.cc
vtable-test.cc:5:1: warning: missing initializer for member ‘sd_bus_vtable::<unnamed union>::<unnamed struct>::features’ [-Wmissing-field-initializers]
5 | };
| ^
vtable-test.cc:5:1: warning: missing initializer for member ‘sd_bus_vtable::<unnamed union>::<unnamed struct>::vtable_format_reference’ [-Wmissing-field-initializers]
$ clang++ -I src/systemd/ -Wmissing-field-initializers -c vtable-test.cc
vtable-test.cc:4:4: warning: missing field 'features' initializer [-Wmissing-field-initializers]
SD_BUS_VTABLE_END
^
src/systemd/sd-bus-vtable.h:188:28: note: expanded from macro 'SD_BUS_VTABLE_END'
.x = { { 0 } }, \
^
1 warning generated.
Both warnings are gone with the patch.]
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