https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117792

            Bug ID: 117792
           Summary: ICE in tsubst_template_args
           Product: gcc
           Version: 15.0
               URL: https://bugs.linaro.org/show_bug.cgi?id=6058
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: clyon at gcc dot gnu.org
  Target Milestone: ---

As described in https://bugs.linaro.org/show_bug.cgi?id=6058, this short code
fragment:
==================================
template <const char *fmt, unsigned int fmt_len, typename... Args>
static void printf_impl(const char *, Args... args)
{}

struct Wrapper
{
    template <typename... Args>
    static void make(Args &&... args)
    {
        static const char fmt[] = "";
        printf_impl<fmt, 2>("");
    }
};

int main()
{
    Wrapper::make();
    return 0;
}
==================================

causes GCC to crash on trunk, since gcc-12.1 according to godbolt, and compiles
OK with gcc-11.4.
It crashes for x86_64, aarch64, arm target at least.


The backtrace from godbolt:
<source>: In instantiation of 'static void Wrapper::make(Args&& ...) [with Args
= {}]':
<source>:17:18:   required from here
   17 |     Wrapper::make();
      |     ~~~~~~~~~~~~~^~
<source>:2:13: internal compiler error: tree check: accessed elt 2 of
'tree_vec' with 1 elts in tsubst, at cp/pt.cc:16467
    2 | static void printf_impl(const char *, Args... args)
      |             ^~~~~~~~~~~
0x28cf075 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, __va_list_tag
(*) [1], diagnostic_t)
        ???:0
0x28e5d65 internal_error(char const*, ...)
        ???:0
0x9a4c09 tree_vec_elt_check_failed(int, int, char const*, int, char const*)
        ???:0
0xcef624 tsubst_template_args(tree_node*, tree_node*, int, tree_node*)
        ???:0
0xcd07ad instantiate_decl(tree_node*, bool, bool)
        ???:0
0xd0ba1b instantiate_pending_templates(int)
        ???:0
0xb9d23b c_parse_final_cleanups()
        ???:0
0xe048c8 c_common_parse_file()
        ???:0

Reply via email to