https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111278
Bug ID: 111278
Summary: error: call to ‘...’ declared with attribute error:
code path is reachable with -Og, but not -O2
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Created attachment 55835
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=55835&action=edit
accel_tcg_cputlb.c.i
Upstream QEMU say this is a compiler bug:
* https://gitlab.com/qemu-project/qemu/-/issues/1848
* https://gitlab.com/qemu-project/qemu/-/issues/1848#note_1540675831
Original report was downstream in Gentoo at https://bugs.gentoo.org/913083.
It builds fine with -O2, but fails with -Og:
```
$ gcc -m64 -mcx16 -O2 -Werror=implicit -Werror=return-type -c
accel_tcg_cputlb.c.i -march=amdfam10
$ gcc -m64 -mcx16 -Og -Werror=implicit -Werror=return-type -c
accel_tcg_cputlb.c.i -march=amdfam10
../accel/tcg/cputlb.c: In function ‘do_ld_mmio_beN’:
../accel/tcg/cputlb.c:2121:13: error: call to ‘qemu_build_not_reached_always’
declared with attribute error: code path is reachable
../accel/tcg/cputlb.c: In function ‘do_st_mmio_leN’:
../accel/tcg/cputlb.c:2764:13: error: call to ‘qemu_build_not_reached_always’
declared with attribute error: code path is reachable
```
This is with 13.2.1 20230902, not tried other versions yet except trunk which
also failed (14.0.0 20230827).
