Linux Kernel contains only C code?

[Jeffrey Walton]

On Mon, Jan 29, 2018 at 10:41 AM, Augusto Mecking Caringi
<augustocaringi at gmail.com> wrote:
> On Fri, Jan 26, 2018 at 2:12 PM,  <valdis.kletnieks at vt.edu> wrote:
>> On Fri, 26 Jan 2018 05:53:20 -0500, Ruben Safir said:
>>> Its not even really C, at least not as a normal application developer
>>> thinks of it.  This is systems programming with a lot of kernel specific
>>> libraries.
>>
>> It's C.  The fact that things like stdio aren't available inside the kernel
>> doesn't mean it's not C.
>
> I would say that is C with GNU extensions [1]... Not plain/pure (ANSI/ISO) C.
>
> That's why it's not so easy to build the Linux Kernel with any other C compiler.
>
> There is a ongoing effort to build it with Clang [2].
>
> I'm not sure how is the current status regarding the Intel C Compiler.

Yeah, the kernel has too much undefined behavior and implementation
defined behavior to build with other compilers at the moment.

It would be nice if they moved away from UB and implementation defined
behvior, but sometimes the political problems are heavier than the
technical solutions.

Jeff