missing-field-initializers warning not reporting missing designated initializers (original) (raw)

In the following code, the missing-field-initializers does not produce a warning that b is not explicitly initialized.

Changing CheckForMissingFields to True here:

seems to produce the expected warning.

The comment suggests

// Disable check for missing fields when designators are used. // This matches gcc behaviour.

However, GCC does produce the warning in that case.
Comparison with GCC: https://godbolt.org/z/WeYdY11q3

struct ExampleStruct { int a; int b; };

ExampleStruct buildExampleStruct(int a) { ExampleStruct e{ .a=a }; return e; }

Build flags: -Werror=missing-field-initializers -std=c++20

Expected behavior:

main.cpp:10:5: error: missing field 'b' initializer [-Werror,-Wmissing-field-initializers]

matching GCCs

Actual behavior: Compiles without warning/error.