https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88554
Bug ID: 88554
Summary: Segfault ICE when falling off the end of a
reference-returning friend operator
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: arthur.j.odwyer at gmail dot com
Target Milestone: ---
struct X {
friend X& operator+=(X&, int) { }
};
https://godbolt.org/z/17PLVW
<source>: In function 'X& operator+=(X&, int)':
<source>:3:37: internal compiler error: Segmentation fault
3 | friend X& operator+=(X&, int) { }
| ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
I assume GCC is trying to give a helpful diagnostic about the missing `return`
statement and following a null pointer in the process. Changing the name of the
friend function from `operator+=` to `foo` makes the segfault disappear.
This is happening in trunk but not in GCC 8.2, so it must be a very recent
regression.
