linux-kernel - Re: [PATCH 1/2] kbuild: replace cc-name test with CONFIG_CC_IS

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Date:   Tue, 30 Oct 2018 23:36:17 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-kbuild@...r.kernel.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        linux-mips@...ux-mips.org, James Hogan <jhogan@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 1/2] kbuild: replace cc-name test with CONFIG_CC_IS_CLANG

Masahiro Yamada <yamada.masahiro@...ionext.com> writes:
> diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
> index 17be664..338e827 100644
> --- a/arch/powerpc/Makefile
> +++ b/arch/powerpc/Makefile
> @@ -96,7 +96,7 @@ aflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(call cc-option,-mabi=elfv1)
>  aflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mabi=elfv2
>  endif
>  
> -ifneq ($(cc-name),clang)
> +ifneq ($(CONFIG_CC_IS_CLANG),y)
>    cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mno-strict-align
>  endif
>  
> @@ -175,7 +175,7 @@ endif
>  # Work around gcc code-gen bugs with -pg / -fno-omit-frame-pointer in gcc <= 4.8
>  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44199
>  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52828
> -ifneq ($(cc-name),clang)
> +ifneq ($(CONFIG_CC_IS_CLANG),y)
>  CC_FLAGS_FTRACE	+= $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)
>  endif
>  endif

Does this behave like other CONFIG variables, ie. it will not be defined
when it's false?

And if so can't we use ifdef/ifndef? eg:

ifndef CONFIG_CC_IS_CLANG
  CC_FLAGS_FTRACE	+= $(call cc-ifversion, -lt, 0409, -mno-sched-epilog)

That reads cleaner to me.

Still this patch is fine as is:

Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)

cheers