toolchain/52660: gcc on sparc crashes when optimizing

[macallan%netbsd.org@localhost]

>Number:         52660
>Category:       toolchain
>Synopsis:       gcc on sparc crashes when optimizing
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 26 18:35:00 +0000 2017
>Originator:     Michael
>Release:        at least since 7.99.*
>Organization:
TNF
>Environment:
NetBSD poteen 8.99.4 (POTEEN.MP) #0: Wed Oct 25 13:00:03 EDT 2017
 ml@paddy:/home/build/obj_sparc/sys/arch/sparc/compile/POTEEN.MP sparc
>Description:
gcc does this with any kind of optimization enabled:
gcc -O hello.c -o hello
main.c: In function 'main':
main.c:7:1: internal compiler error: Floating point exception
 }
 ^
no stack trace because unwind library not available
Please submit a full bug report,
with processed source if appropriate

I have not seen this on anything other than sparc, not even sparc64, this is a userland built from yesterday's sources. The compiler works with optimization disabled.

gcc version 5.4.0 (nb1 20160606)

The source used:
#include <stdio.h>

int main()
{
  printf("hello world!\n");
  return 0;
}

>How-To-Repeat:
try to compile anything with -On with n > 0
>Fix: