https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122740
Bug ID: 122740
Summary: internal compiler error: crash at cp/call.cc:8712 when
union has reference member initialized with literal
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: ice-checking, ice-on-invalid-code
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: attackerj1113 at gmail dot com
Target Milestone: ---
The following code causes ICE out on x86-64 gcc since version 15.1(assertions)
and reproducible on trunk:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
template <typename T>
class A {
public:
A(T){}
};
union Test {
const int& k = 10;
};
A w = A{Test{}};
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Clang/EDG report the error correctly, but MSVC also triggers an ICE.
Please check https://godbolt.org/z/sTdTvoMjE
A union containing a const int& member initialized with a literal expression
triggers an ICE in convert_like_internal during compound literal construction.
Compiler Output:
<source>:8:14: error: non-static data member 'Test::k' in a union may not have
reference type 'const int&'
8 | const int& k = 10;
| ^
<source>:11:14: internal compiler error: in convert_like_internal, at
cp/call.cc:8712
11 | A w = A{Test{}};
| ^
0x29109c8 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x290578b internal_error(char const*, ...)
???:0
0xb0d332 fancy_abort(char const*, int, char const*)
???:0
0xb457ce initialize_reference(tree_node*, tree_node*, int, int)
???:0
0xe29080 convert_for_initialization(tree_node*, tree_node*, tree_node*, int,
impl_conv_rhs, tree_node*, int, int)
???:0
0xdcbabb finish_compound_literal(tree_node*, tree_node*, int, fcl_t)
???:0
0xd475a3 c_parse_file()
???:0
0xeb6639 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.
Compiler returned: 1
