Re: Compilation errors

["Fabio M. De Francesco" <fmdefrancesco@gmail.com>]

On venerdì 1 aprile 2022 12:13:57 CEST Stefano Brivio wrote:
> Hi Fabio,
> 
> On Fri, 01 Apr 2022 11:35:13 +0200
> "Fabio M. De Francesco" <fmdefrancesco@gmail.com> wrote:
> >
> > [...]
> > 
> > Can someone help me to understand what is happening and how to fix this issue?
> > Could it depend on a configuration option that, unintentionally enabled, make 
> > the build fail whenever "case label does not reduce to an integer constant" is 
> > hit? If so, which option?
> 
> Those would be warnings, but kernel builds switched to -Werror by
> default a while ago, see commit 3fe617ccafd6 ("Enable '-Werror' by
> default for all kernel builds") -- meaning that all warnings are
> treated as errors. You can disable CONFIG_WERROR:
> 
> 	scripts/config -d WERROR
> 
> to double check. 

Hi Stefano,

Thanks for your prompt reply!

I know that the kernel has switched to -Werror by default. I use a largely 
customized .config and I can confirm you that CONFIG_WERROR is _not_ enabled:

xp4ns3@leap> grep CONFIG_WERROR .config
# CONFIG_WERROR is not set

>
> [...]
>
> As to why it started happening for you recently: maybe you just
> switched to gcc 11 and a newer version of clang? Can you try with
> gcc 10 if you have it still installed?

I had it not anymore installed, so I had to re-install gcc v10. With it
I ran "make clean && CC=gcc-10 make -j12" but it still triggers the same 
errors and the build still fails.

The last output line, just before exit, is:

make: *** [Makefile:1838: drivers] Error 2

Furthermore, I want to make you notice that I have no errors when I 
build Torvald's tree with gcc v11. In fact, I rebuilt it now again and 
got no failures.

Why is this issue showing only with staging-testing? I cannot yet see 
any reasonable explanation.

Any other ideas? If I'm not able to figure out what's happening, I won't
be able to contribute to staging anymore. Greg (reasonably) requires that
all the changes get built before sending patches, therefore, this issue
is a blocker. I'm losing the chance to be selected for the Outreachy
internship.

Since I have more or less 100 patches already in Torvald's tree, can I
be exempted from working on those 10 required patches for staging? 
Otherwise I could simply send 10 clean-up patches that I can confidently
send without trying to compile them. Or I can send patches for Torvald's
tree. I really don't know what to do.

As said above: any more ideas? 

Regards,

Fabio
 
> 
> -- 
> Stefano
>