https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119567
Bug ID: 119567
Summary: "unknown operator" in pointer subtraction diagnostic
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: tbaeder at redhat dot com
Target Milestone: ---
See: https://godbolt.org/z/fnPn844oY
constexpr int (*p1)[0] = 0, (*p2)[0] = 0;
constexpr int k2 = p2 - p1;
prints:
<source>:4:23: error: arithmetic on pointer to an empty aggregate
4 | constexpr int k2 = p2 - p1;
| ~~~^~~~
<source>:4:23: error: '(0 <unknown operator> 0)' is not a constant expression
Not sure if the two 0s are correct either, but the "unknown operator" for a
subtraction seems very wrong.
