[lkml]   [2017]   [May]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: Updating cross compilers?
On Wed, May 10, 2017 at 12:18 AM, Segher Boessenkool
<> wrote:
> On Tue, May 09, 2017 at 03:59:27PM +0100, Andre Przywara wrote:
>> >> I was able to build (bare-metal) toolchains for
>> >> all architectures except arc, m68k, tilegx and tilepro.
>> >
>> > arc needs a more recent GCC; the other probably as well. GCC 7 should
>> > be out very soon, you probably want to wait for that :-)
>> Well, GCC 7 indeed builds better, but then again is a very new compiler.
>> For instance in the moment it spits a lot of warnings when compiling the
>> kernel (mostly due to some *printf analysis). It's not hard to fix, but
>> this will take a while to trickle in and it's questionable whether this
>> will be backported everywhere.
>> So in addition to GCC 7.1 I'd like to have at least GCC 6.3 around,
>> which builds kernels without warnings today.
> If you don't want warnings, turn off the warnings or just don't look at
> them... or fix the problems? Many of the new warnings point out actual
> problems.
> Many of those sprintf problems in the kernel have already been fixed.

I've been using gcc-7.0 for a long time and fixed a lot of bugs it found,
along with more harmless warnings, but I had disabled a couple of
warning options when I first installed gcc-7 and ended up ignoring

The exact set of additional options I used is:

-Wimplicit-fallthrough=0 -Wno-duplicate-decl-specifier
-Wno-int-in-bool-context -Wno-bool-operation -Wno-format-truncation

there were a couple of others that I sent kernel fixes for instead.
I should probably revisit that list and for each of them either
only enable it with "make W=1" or fix all known warnings.
In the long run, I'd actually hope to fix all W=1 warnings too
and enable them by default.


 \ /
  Last update: 2017-05-10 21:21    [W:0.146 / U:0.412 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site