[PATCH] D64742: Allow using -ftrivial-auto-var-init=zero in C mode without extra flags

[Alexander Potapenko via Phabricator via cfe-commits]

glider added a comment.

In D64742#1717054 <https://reviews.llvm.org/D64742#1717054>, @mehdi_amini wrote:

> In D64742#1606244 <https://reviews.llvm.org/D64742#1606244>, @glider wrote:
>
> > As a data point, Linus Torvalds suggested that we need a similar feature for GCC so that the "kernel C standard" mandates zero-initialization for locals: https://lkml.org/lkml/2019/7/28/206
>
>
> I'm wondering why they never pushed all the way for a `-std=linux-c` flag instead, and produced a documentation with the behavior they want with respect to the base C standard they align on.


Guess this was never necessary, as GCC used to be the only compiler that could build the Linux kernel, and the standard could be defined by a combination of GCC flags.
This is no more the case, but adding a separate "standard" (which may end up being vaguely defined and containing ad-hoc hacks) will require a lot of effort from the three communities (Linux, GCC and LLVM)


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