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Date: Thu, 22 Feb 2018 14:22:02 +1100
From: Michael Ellerman <mpe@...erman.id.au>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>, Arnd Bergmann <arnd@...db.de>
Cc: Rich Felker <dalias@...c.org>, Kernel Hardening
<kernel-hardening@...ts.openwall.com>, X86 ML <x86@...nel.org>, Paul
Mackerras <paulus@...ba.org>, "H. Peter Anvin" <hpa@...or.com>, sparclinux
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Sato <ysato@...rs.sourceforge.jp>, Jonathan Corbet <corbet@....net>,
Richard Weinberger <richard@....at>, Linux-sh list
<linux-sh@...r.kernel.org>, Linus Torvalds
<torvalds@...ux-foundation.org>, Ingo Molnar <mingo@...hat.com>, Emese
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<linux-kernel@...r.kernel.org>, linuxppc-dev
<linuxppc-dev@...ts.ozlabs.org>, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 00/23] kconfig: move compiler capability tests to Kconfig
Masahiro Yamada <yamada.masahiro@...ionext.com> writes:
>
<snip>
>
> (Case 3)
> Compiler flag -foo is sensitive to endian-ness.
>
>
> config CC_NEEDS_BIG_ENDIAN
> def_bool $(cc-option -mbig-endian) && CPU_BIG_ENDIAN
>
> config CC_NEEDS_LITTLE_ENDIAN
> def_bool $(cc-option -mlittle-endian) && CPU_LITTLE_ENDIAN
>
> config CC_HAS_FOO
> bool
> default $(cc-option -mbig-endian -foo) if CC_NEEDS_BIG_ENDIAN
> default $(cc-option -mlittle-endian -foo) if CC_NEEDS_LITTLE_ENDIAN
> default $(cc-option -foo)
We may do something like this on powerpc, where we have 32/64-bit and
big/little endian (on 64-bit) and then some ABI options that we
set/unset depending on endian.
The above looks like it could work though.
cheers
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