Hi Arnd, long time no see,

On Wed, May 10, 2017 at 09:58:13AM +0200, Arnd Bergmann wrote:

quoted

quoted

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
those.

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
-Wno-format-overflow

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.

Most of those usually point out actual problems (at least code that
isn't as clear as it should be).  I do hate that first one though.


Segher