> On 16 Feb 2023, at 18:42, Jeffrey Walton <noloa...@gmail.com> wrote: > > I think some of the kernel devs are the biggest problem. Some of the > developers feel GCC is the only compiler to support. They rely on > GCC-isms, and don't care about things like undefined behavior since it > "works for me using GCC." I've even had some of the devs tell me they > don't care about the C standard. That was very befuddling to me.
The problem is that LLVM has different undefined behaviour from GCC. That has to be understood and coded around. You cannot write an OS or device driver based on the C standard's memory model. Linux has its own definition of a memory-model that any compiler must be able to implement to write a kernel. There are articles on lwn.net that talk to these issues. Try a search for "lwn bad compiler" to find https://lwn.net/Articles/799218/ and others that talk about why this is not what you are suggesting. Barry
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