linux-kernel - Re: [PATCH] compiler/gcc: Raise minimum GCC version for kernel builds to 4.8

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Message-ID: <8c5f8a2c-0ca2-b2f2-4278-d02198d4dd8d@roeck-us.net>
Date:   Tue, 26 May 2020 09:03:55 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Will Deacon <will@...nel.org>, Brian Cain <bcain@...eaurora.org>,
        linux-hexagon@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] compiler/gcc: Raise minimum GCC version for kernel builds
 to 4.8

Hi Nick,

On 5/26/20 8:40 AM, Nick Desaulniers wrote:
> On Tue, May 26, 2020 at 8:30 AM Guenter Roeck <linux@...ck-us.net> wrote:
>>
>> On Mon, May 11, 2020 at 09:41:37PM +0100, Will Deacon wrote:
>>> It is very rare to see versions of GCC prior to 4.8 being used to build
>>> the mainline kernel. These old compilers are also known to have codegen
>>> issues which can lead to silent miscompilation:
>>>
>>> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145
>>>
>>> Raise the minimum GCC version to 4.8 for building the kernel and remove
>>> some tautological Kconfig dependencies as a consequence.
>>
>> My hexagon compiler is v4.6.1, and I have been unable to find a more
>> recent version. Does anyone happen to have a pointer to a hexagon toolchain
>> with gcc 4.8 or later ?
> 
> IIUC, hexagon moved to LLVM, though that target still has issues
> building the kernel.
> https://github.com/ClangBuiltLinux/linux/issues?q=is%3Aopen+is%3Aissue+label%3A%22%5BARCH%5D+hexagon%22
> 

That won't help me for my build tests. It is bad enough having to maintain
one compiler. I don't want to add another one to the mix, and I'll happily
leave llvm build tests for ClangBuiltLinux. Guess I'll have to stop hexagon
test builds starting with 5.8.

Guenter