[Bug c++/96934] Copy initialization of struct involving aggregate array initialization miscompiles in GCC 9

[wielkiegie at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96934

--- Comment #1 from Gustaw Smolarczyk  ---
It seems that part of this issue was already reported in another bug report
(though the report is about flexible array members, the comment does not
reference them):

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91490#c6

However, I don't see any mention of the miscompilation in the thread. Possibly
the issue didn't surface in comment 6 as the tested string has only a single
character (+ the terminating null character). Or strcmp is needed in order to
trigger it.

[Bug c++/96934] Copy initialization of struct involving aggregate array initialization miscompiles in GCC 9

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96934

--- Comment #2 from Andrew Pinski  ---
Testcase:
#include 

struct Code
{
constexpr Code(int) noexcept : _buffer{'1', '2', '\0'} {}

char _buffer[3];
};

const Code T1 = {1};
const Code T2 = Code{1};
const Code T3 = T1;
const Code T4 = T2;
const Code T5{1};
const Code T6 = T5;

#define TEST T1

int
foo(const char* x)
{
  return std::strcmp(TEST._buffer, x);
}

size_t
bar()
{
  return std::strlen(TEST._buffer);
}