[Bug c++/123354] New: ICE with nested structures and sizeof of constexpr variable

[antoshkka at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123354

            Bug ID: 123354
           Summary: ICE with nested structures and sizeof of constexpr
                    variable
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: antoshkka at gmail dot com
  Target Milestone: ---

The following code causes ICE since GCC-14:


template<typename T>
void foo() {
    static constexpr char string[] = "mew";
    struct s1_t {
        struct s2_t {
            int dummy { 0 };
            char* ptr { static_cast<char*>(::operator new(sizeof(string)))};
        } s2;
    } object;
};

int main() {
    foo<void>();
}


Godbolt playground: https://godbolt.org/z/WE1hz4fn5