linux-kernel - Re: [PATCH v2] kbuild: check the minimum compiler version in Kconfig

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Message-ID: <CAK7LNAQHA7FpYfdDaOuf+t+nMCtLH=Z7cdoK+3z3ScZ3Fn9Xww@mail.gmail.com>
Date:   Thu, 14 Jan 2021 18:20:15 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Ilie Halip <ilie.halip@...il.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Will Deacon <will@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] kbuild: check the minimum compiler version in Kconfig

On Thu, Jan 14, 2021 at 4:55 PM Ilie Halip <ilie.halip@...il.com> wrote:
>
> Hi Masahiro,
>
> > +       #elif defined(__INTEL_COMPILER)
> > +       /* How to get the version of intel compiler? */
> > +       ICC     0               0               0
>
> According to Intel documentation[1], this should do the trick:
>
>     ICC     __INTEL_COMPILER  __INTEL_COMPILER_UPDATE
> __INTEL_COMPILER_BUILD_DATE
>
> I don't have the compiler installed, but I tested this on godbolt[2] and
> looks fine to me. What do you think?
>
> [1] https://software.intel.com/content/www/us/en/develop/documentation/cpp-compiler-developer-guide-and-reference/top/compiler-reference/macros/additional-predefined-macros.html
> [2] https://godbolt.org/z/E5PE6f
>
> I.H.

Thanks.

The following is the result from godbolt
(except the beta releases of 21.1.*)


version    __INTEL_COMPILER  __INTEL_COMPILER_UPDATE
13.0.1     1300               (unsupported)
16.0.3     1600               3
17.0.0     1700               0
18.0.0     1800               0
19.0.0     1900               0
19.0.1     1900               0



Presumably, the version string xx.yy.zz corresponds to
__INTEL_COMPILER=xxyy
__INTEL_COMPILER_UPDATE=zz

The output from 19.0.1 does not make sense, though.



BTW, when I tried ICC a few years ago,
I could not build the kernel with it.


-- 
Best Regards
Masahiro Yamada