https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126223
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |15.3.0, 16.1.0
Status|UNCONFIRMED |NEW
Known to work| |14.4.0, 15.2.0
Last reconfirmed| |2026-07-31
Ever confirmed|0 |1
Target Milestone|--- |15.4
CC| |ppalka at gcc dot gnu.org
Keywords| |ice-on-valid-code
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=120499
Summary|Compiler fails with message |[15/16/17 Regression]
|"internal compiler error: |Compiler fails with message
|Segmentation fault" |"internal compiler error:
| |Segmentation fault"
--- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Confirmed, seems to have started with r16-3353 which has been backported to
15.3.
$ cat 126223_a.C
module;
#include <compare>
export module a;
struct A {
int x;
std::strong_ordering operator<=>(const A&) const;
};
export struct B {
A a;
int y;
friend auto operator<=>(const B&, const B&) = default;
};
$ cat 126223_b.C
#include <compare>
import a;
bool useB() {
auto b1 = B{.a = {.x = 1}, .y = 2};
auto b2 = B{.a = {.x = 1}, .y = 3};
return b1 < b2;
}
$ g++ -fmodules 126223_{a.C,b.C}
In module a, imported at 126223_b.C:2:
126223_a.C:14:17: internal compiler error: in mangle_module, at
cp/module.cc:16805
14 | friend auto operator<=>(const B&, const B&) = default;
| ^~~~~~~~
