linux-kernel - Re: [PATCH 4/4] gcov: clang: pick GCC vs Clang format depending on compiler

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Date:   Tue, 15 Jan 2019 09:52:10 -0800
From:   Tri Vo <trong@...roid.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     oberpar@...ux.ibm.com, Greg Hackmann <ghackmann@...roid.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-team@...roid.com
Subject: Re: [PATCH 4/4] gcov: clang: pick GCC vs Clang format depending on compiler

On Mon, Jan 14, 2019 at 5:25 PM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> On Tue, Jan 15, 2019 at 6:07 AM Tri Vo <trong@...roid.com> wrote:
> >
> > Clang gcov format is only supported by Clang compiler, and Clang
> > compiler only supports Clang format.
>
>
> If so, what is the point of putting GCOV_FORMAT_CLANG into the
> choice menu?
>
>
> You can choose the format only when you are using GCC.
>
> I think the following is more sensible:
>
>
> if GCOV_KERNEL
>
> config GCOV_PROFILE_ALL
>          ....
>
>
> choice
>         prompt "Specify GCOV format for GCC"
>         depends on CC_IS_GCC
>         ...
>
> config GCOV_FORMAT_3_4
>         bool "GCC 3.4 format"
>         depends on GCC_VERSION < 40700
>         ...
>
> config GCOV_FORMAT_4_7
>         bool "GCC 4.7 format"
>         ...
>
> endchoice
>
>
> config GCOV_FORMAT_CLANG
>          def_bool CC_IS_CLANG
>
> endif
>
>
>
>
>
> Or, you can delete GCOV_FORMAT_CLANG
> if you write the Makefile like follows:
>
>
>
> obj-y := base.o fs.o
> obj-$(CONFIG_GCOV_FORMAT_3_4) += gcc_base.o gcc_3_4.o
> obj-$(CONFIG_GCOV_FORMAT_4_7) += gcc_base.o gcc_4_7.o
> obj-$(CONFIG_CC_IS_CLANG)     += clang.o

Thanks for the suggestion! It is more sensible than the current
approach. I'll send an update.