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From: "fchelnokov at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110114] New: ICE on calling overloaded function in case of
 incomplete argument type
Date: Sun, 04 Jun 2023 17:46:01 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.1.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: fchelnokov at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110114

            Bug ID: 110114
           Summary: ICE on calling overloaded function in case of
                    incomplete argument type
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fchelnokov at gmail dot com
  Target Milestone: ---

This program

struct A {
    int a,b;
};

struct B;

void foo(const A &) {}
void foo(const B &) {}

int main() {
    foo({.a=3D0});
}

is accepted by Clang and MSVC, but GCC 13 crashes on it with the message:

<source>:11:8: internal compiler error: Segmentation fault
   11 |     foo({.a=3D0});
      |     ~~~^~~~~~~~
0x1ce67fe internal_error(char const*, ...)
        ???:0
0x751149 build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ???:0
0x8eaa5c finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, b=
ool,
bool, int)
        ???:0
0x89f99b c_parse_file()
        ???:0
0x98c2b9 c_common_parse_file()
        ???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Online demo: https://godbolt.org/z/z7KPGrWsz=