https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126440
Patrick Palka <ppalka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2026-07-31
Ever confirmed|0 |1
CC| |ppalka at gcc dot gnu.org
Keywords| |ice-checking,
| |ice-on-valid-code
Status|UNCONFIRMED |NEW
--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Confirmed. Seems not specific to <iostream> or to any other standard library
header unit, or even its contents:
$ cat 126440_a.H
// contents don't matter
$ cat 126440_b.C
export module list:node;
export struct Node {};
$ cat 126440_c.C
export module list;
export import :node; // #1
import "126440_a.H"; // #2
$ g++ -fmodules 126440_{a.H,b.C,c.C}
126440_c.C:1:8: internal compiler error: in write_location, at
cp/module.cc:18835
1 | export module list;
| ^~~~~~
Swapping the order of #1 and #2 makes it work.
