linux-kernel - Re: [PATCH 3/3] isystem: delete global -isystem compile option

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Message-ID: <YQhWQkbN+pe354RW@localhost.localdomain>
Date:   Mon, 2 Aug 2021 23:32:02 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, masahiroy@...nel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 3/3] isystem: delete global -isystem compile option

On Mon, Aug 02, 2021 at 11:18:32AM -0700, Nathan Chancellor wrote:
> On Sun, Aug 01, 2021 at 11:13:36PM +0300, Alexey Dobriyan wrote:
> > In theory, it enables "leakage" of userspace headers into kernel which
> > may present licensing problem.
> > 
> > In practice, only stdarg.h was used, stdbool.h is trivial and SIMD
> > intrinsics are contained to a few architectures and aren't global
> > problem.
> > 
> > In general, kernel is very self contained code and -isystem removal
> > will further isolate it from Ring Threeland influence.
> > 
> > nds32 keeps -isystem globally due to intrisics used in entrenched header.
> > 
> > -isystem is selectively reenabled for some files.
> > 
> > Not compile tested on hexagon.
> 
> With this series on top of v5.14-rc4 and a tangential patch to fix
> another issue, ARCH=hexagon defconfig and allmodconfig show no issues.
> 
> Tested-by: Nathan Chancellor <nathan@...nel> # build (hexagon)

Oh wow, small miracle. Thank you!

Where can I find a cross-compiler? This link doesn't seem to have one
https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/11.1.0/