Re: notes on building 3.20

[Bastien Nocera <hadess hadess net>]

On Wed, 2016-03-23 at 12:44 -0400, Matthias Clasen wrote:
> Hey, some quick observations from building the 3.20.0 moduleset with
> gcc 6 on Fedora 24:
>
> gcc got a lot better. That means it has a lot more warnings. The ones
> that affect multiple modules are -Werror=format-nonliteral and
> -Werror=format-y2k. Both of cause build failures all over the place.
>
> Please make an effort to fix these in your code. At least the
> format-nonliteral warning often indicates actual, exploitable
> security
> holes.

If you still have gcc 5, you can make this error show up by using those
CFLAGS:
-Werror=format=2 -Wformat=2

Make sure that -Wformat=2 isn't overwritten later in the CFLAGS list.
And for those on Fedora 23, you can easily install GCC 6 to enjoy the
build breakage yourselves by running:
dnf update --releasever=24 gcc binutils

Cheers