https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85974
Bug ID: 85974 Summary: Failure to optimize difference of two pointers into a compile time constant Product: gcc Version: 9.0 Status: UNCONFIRMED Severity: minor Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: pkoning at gcc dot gnu.org Target Milestone: --- This issue is exposed by test case testsuite/gcc.c-torture/compile/930326-1.c, on platforms where ptrdiff_t is not "long" (such as pdp11). In that case, the last line: long i = s.f-&s.b; fails with "error: initializer element is not computable at load time". It's not a target bug; the problem can be reproduced for other targets by changing the "long" to "char" in that statement.