[Bug fortran/68829] [4.9/5/6 Regression] Segfaults with -Ofast

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68829

Dominique d'Humieres <dominiq at lps dot ens.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-12-10
     Ever confirmed|0                           |1

--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
On darwin you can increase the stack limit (ulimit -s is hard coded to 65532
kbytes)
with -Wl,-stack_size,0x20000000,-stack_addr,0xc0000000:

[Book15] f90/bug% gfc -O3 -fstack-arrays pr68829.f90
-Wl,-stack_size,0x10000000,-stack_addr,0xc0000000
[Book15] f90/bug% a.out
Illegal instruction
[Book15] f90/bug% gfc -O3 -fstack-arrays pr68829.f90
-Wl,-stack_size,0x20000000,-stack_addr,0xc0000000
[Book15] f90/bug% a.out
    67108864

> But it's also that you are asking for it with -Ofast.  Maybe the frontend
> should have a switch to specifiy a size limit?

Good idea, any volunteer?