linux-kernel - Re: [PATCH v5 24/31] kconfig: add CC_IS_GCC and GCC

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Date:   Tue, 05 Jun 2018 07:50:56 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Nicholas Piggin <npiggin@...il.com>,
        "Luis R . Rodriguez" <mcgrof@...e.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Ulf Magnusson <ulfalizer@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kbuild-owner@...r.kernel.org
Subject: Re: [PATCH v5 24/31] kconfig: add CC_IS_GCC and GCC_VERSION

On 05.06.2018 02:07, Masahiro Yamada wrote:
> Hi Stefan
> 
> 2018-06-05 6:49 GMT+09:00 Stefan Agner <stefan@...er.ch>:
>> Hi Masahiro,
>>
>> On 28.05.2018 11:22, Masahiro Yamada wrote:
>>> This will be useful to specify the required compiler version,
>>> like this:
>>>
>>> config FOO
>>>         bool "Use Foo"
>>>         depends on GCC_VERSION >= 40800
>>>         help
>>>           This feature requires GCC 4.8 or newer.
>>>
>>
>> I tried using CC_IS_GCC today while using clang. It seems that it is set
>> to y despite I am using CC=clang.
>>
>> .config looks like this after config:
>>
>> ...
>> CONFIG_CC_IS_GCC=y
>> CONFIG_GCC_VERSION=40201
>> CONFIG_CC_IS_CLANG=y
>> CONFIG_CLANG_VERSION=60000
>> ...
>>
>>
>> I am using clang 6.0.0 on Arch Linux, which seems to return a version
>> when using gcc-version.sh:
>> ./scripts/gcc-version.sh clang | sed 's/^0*//'
>> 402
>>
>> I guess that should not be the case?
>>
> 
> 
> What will 'clang --version' print on your machine?

$ clang --version
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir:
/home/ags/gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabihf/bin

I use a symlink to clang in my cross compiler toolchain, that is why
InstalledDir points to a GCC toolchain.

--
Stefan