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From: "iDingDong at outlook dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/100698] New: Error when initializing a struct member of
 type char[N] with short string literal
Date: Thu, 20 May 2021 09:52:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100698

            Bug ID: 100698
           Summary: Error when initializing a struct member of type
                    char[N] with short string literal
           Product: gcc
           Version: 11.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: iDingDong at outlook dot com
  Target Milestone: ---

//---
struct [[maybe_unused]] A {
    char a[5];
};

int main() {
    A x =3D { .a =3D "Hey!" }; // OK
    A y =3D { .a =3D { 'H', 'i', '\0' } }; // OK
    A z =3D { .a =3D "Hi" }; // error: C99 designator 'a' outside aggregate
initializer
    return 0;
}
//---

Compiled with

> g++ -std=3Dc++20 test.cpp

This error is only triggered when attempting to initialize an array of char
with a string literal of smaller size than the array was defined.=