[Bug c++/105060] New: [10/11] ICE with consteval function: internal compiler error: in cp_gimplify_expr, at cp/cp-gimplify.c:14879 with keep-inline-functions

[lutztonineubert at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105060

            Bug ID: 105060
           Summary: [10/11] ICE with consteval function: internal compiler
                    error: in cp_gimplify_expr, at cp/cp-gimplify.c:14879
                    with keep-inline-functions
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lutztonineubert at gmail dot com
  Target Milestone: ---

Compiled with g++ 10/11 and -fkeep-inline-functions -std=c++20. Doesn't seem to
happen with current trunk.

ERROR:

<source>: In constructor 'consteval
basic_format_string<Args>::basic_format_string(const S&) [with S = char [1];
Args = {char, <unnamed enum>}]':
<source>:19:5: internal compiler error: in gimplify_expr, at gimplify.c:14879
   19 |     if (!check()) {
      |     ^~
0x1786229 internal_error(char const*, ...)
        ???:0
0x678608 fancy_abort(char const*, int, char const*)
        ???:0
0xab0f92 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ???:0
0xab1068 gimplify_stmt(tree_node**, gimple**)
        ???:0
0xaaebb2 gimplify_expr(tree_node**, gimple**, gimple**, bool (*)(tree_node*),
int)
        ???:0
0xab1068 gimplify_stmt(tree_node**, gimple**)
        ???:0
0xab212b gimplify_body(tree_node*, bool)
        ???:0
0xab259f gimplify_function_tree(tree_node*)
        ???:0
0x943cf7 cgraph_node::analyze()
        ???:0
0x94707d symbol_table::finalize_compilation_unit()
        ???:0

CODE:

template <typename T>
struct type_identity {
  using type = T;
};

template <typename T>
using type_identity_t = typename type_identity<T>::type;

constexpr int check() {
  return {};
}

template <typename... Args>
class basic_format_string {
 public:
  template <typename S>
  consteval basic_format_string(const S& s) {
    if (!check()) {
    }
  }
};

template <typename... Args>
using format_string = basic_format_string<char, type_identity_t<Args>...>;

template <typename... Args>
void test(format_string<Args...> format_str, const Args&... args) {}

enum { Blue };

void g() {
  test("", Blue);
}



See: https://gcc.godbolt.org/z/M7v96YPn1