linux-kernel - Re: [PATCH RFC] kbuild: Prevent compiler mismatch with external modules

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Message-ID: <20210305192451.xx6bm7t24amutukg@treble>
Date:   Fri, 5 Mar 2021 13:24:51 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Justin Forbes <jforbes@...hat.com>,
        Ondrej Mosnacek <omosnace@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Miroslav Benes <mbenes@...e.cz>,
        David Laight <David.Laight@...lab.com>,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: [PATCH RFC] kbuild: Prevent compiler mismatch with external
 modules

On Sat, Mar 06, 2021 at 01:28:22AM +0900, Masahiro Yamada wrote:
> > +orig_name   := $(if $(CONFIG_CC_IS_GCC),GCC,CLANG)
> > +orig_minor  := $(shell expr $(if $(CONFIG_CC_IS_GCC),$(CONFIG_GCC_VERSION),$(CONFIG_CLANG_VERSION)) / 100)
> > +cur_namever := $(shell $(srctree)/scripts/cc-version.sh $(CC))
> > +cur_name    := $(word 1,$(cur_namever))
> > +cur_minor   := $(shell expr $(word 2,$(cur_namever)) / 100)
> 
> These are still calculated by 'make M=... clean' or 'make M=... help'.
> Using '=' assignment solves it, but the code is still ugly.
> 
> 
> I attached my alternative implementation.

Thanks for the attached patch, yours looks much cleaner.  Looks like it
warns on *any* mismatch, rather than just a major.minor mismatch.  But
that's ok with me.

Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

-- 
Josh