[RFC v2 01/39] Kconfig: introduce HAS_IOPORT option and select it as necessary

[Finn Thain]

On Sun, 8 May 2022, I wrote:

> 
> That suggests to me that we need a "bool CONFIG_WARINGS_INTO_ERRORS" to 
> control -Werror, which could be disabled for .config files (like make 
> allmodconfig) where it is not helping.
> 

I just noticed that we already have CONFIG_WERROR. So perhaps something 
like this would help.

diff --git a/init/Kconfig b/init/Kconfig
index ddcbefe535e9..765d83fb148e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -150,6 +150,8 @@ config WERROR
 
 	  However, if you have a new (or very old) compiler with odd and
 	  unusual warnings, or you have some architecture with problems,
+	  or if you are using a compiler that doesn't happen to interpret
+	  the C standards in quite the same way as some other compilers,
 	  you may need to disable this config option in order to
 	  successfully build the kernel.