Re: [pushed] c++: add fixed test [PR126472]

On Fri, Aug 21, 2026 at 5:00 AM Patrick Palka <[email protected]> wrote:
>
> Fixed by r17-2835 for PR c++/126335 and, unlike that PR's testcase, did
> not depend on r17-1661 to trigger the bug.
>
>         PR c++/126472
>
> gcc/testsuite/ChangeLog:
>
>         * g++.dg/cpp0x/initlist135.C: New test.

On Linux/x86-64, I got

FAIL: g++.dg/cpp0x/initlist135.C  -std=c++11 (test for excess errors)
Excess errors:
/export/gnu/import/git/gitlab/x86-gcc-test/gcc/testsuite/g++.dg/cpp0x/initlist135.C:5:28:
fatal error: definition of 'struct std::initializer_list<_E>' does not
match '#include <initializer_list>'
compilation terminated.

with -m32.

> ---
>  gcc/testsuite/g++.dg/cpp0x/initlist135.C | 47 ++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
>  create mode 100644 gcc/testsuite/g++.dg/cpp0x/initlist135.C
>
> diff --git a/gcc/testsuite/g++.dg/cpp0x/initlist135.C b/gcc/testsuite/g++.dg/cpp0x/initlist135.C
> new file mode 100644
> index 000000000000..759ff6833a2e
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/cpp0x/initlist135.C
> @@ -0,0 +1,47 @@
> +// PR c++/126472
> +// { dg-do run { target c++11 } }
> +
> +namespace std {
> +template <class _E> struct initializer_list {
> +  typedef const _E *const_iterator;
> +  const _E *_M_array;
> +  unsigned long _M_len;
> +  const_iterator begin() const { return _M_array; }
> +  const_iterator end() const { return begin() + _M_len; }
> +};
> +struct _Optional_payload_base {
> +  struct _Storage {
> +    constexpr _Storage() : _M_empty() {}
> +#if __cpp_constexpr >= 201907L
> +    constexpr
> +#endif
> +    ~_Storage() {}
> +    int _M_empty;
> +  } _M_payload;
> +};
> +struct _Optional_payload : _Optional_payload_base {};
> +template <typename> struct optional {
> +  constexpr optional() {}
> +  template <typename _Up> optional(_Up) {}
> +  _Optional_payload _M_payload;
> +};
> +template <typename _T1, typename _T2> struct pair {
> +  _T1 first;
> +  _T2 second;
> +  constexpr pair(_T1 __x, _T2 __y) : first(__x), second(__y) { }
> +};
> +template <typename> struct vector {
> +  vector(int, int) {}
> +};
> +} // namespace std
> +
> +using namespace std;
> +const initializer_list<pair<optional<vector<int>>, int>> data {
> +  pair<optional<vector<int>>, int>( optional<vector<int>>(vector<int>(1, 10)), 42), // non-constant
> +  pair<optional<vector<int>>, int>( optional<vector<int>>(), 100), // constant
> +};
> +
> +int main() {
> +  if (data.begin()[0].second != 42 || data.begin()[1].second != 100)
> +    __builtin_abort();
> +}
> --
> 2.55.0.618.g1a3e64c6c4
>


-- 
H.J.