Re: [Qemu-devel] [PATCH 1/3] configure: add option to disable -fstack-protector flags

[Paolo Bonzini]

Il 09/01/2014 22:55, Steven Noonan ha scritto:
> From: Steven Noonan <address@hidden>
> 
> The -fstack-protector flag family is useful for ensuring safety and for
> debugging, but has a performance impact. Here's a boot time comparison between
> a QEMU build of qemu-system-arm with and without the -fstack-protector-all
> flag:
> 
>     # WITHOUT -fstack-protector-all
>     address@hidden ~]# systemd-analyze
>     Startup finished in 1.744s (kernel) + 11.345s (initrd) + 47.164s 
> (userspace) = 1min 255ms
> 
>     # WITH -fstack-protector-all
>     address@hidden ~]# systemd-analyze
>     Startup finished in 1.843s (kernel) + 12.262s (initrd) + 1min 3.480s 
> (userspace) = 1min 17.587s

Can you try -fstack-protector-strong?

Probably the right thing to do is to pick in order
-fstack-protector-strong, -fstack-protector, and nothing.

Paolo