linux-kernel - Re: [PATCH] Makefile: Fix unrecognized cross-compiler command line options

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Date:	Mon, 09 Jun 2014 23:36:16 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Behan Webster <behanw@...verseincode.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Makefile: Fix unrecognized cross-compiler command line
 options

Dne 27.5.2014 09:54, Geert Uytterhoeven napsal(a):
> On architectures that setup CROSS_COMPILE in their arch/*/Makefile
> (arc, blackfin, m68k, mips, parisc, score, sh, tile, unicore32, xtensa),
> cc-option and cc-disable-warning may check against the wrong compiler,
> causing errors like
> 
>     cc1: error: unrecognized command line option "-Wno-maybe-uninitialized"
> 
> if the host gcc supports a compiler option, while the cross compiler
> doesn't support that option.
> 
> Move all logic using cc-option or cc-disable-warning below the inclusion
> of the arch's Makefile to fix this.
> 
> Introduced by
>   - commit e74fc973b6e531fef1fce8b101ffff05ecfb774c ("Turn off
>     -Wmaybe-uninitialized when building with -Os"),
>   - commit 61163efae02040f66a95c8ed17f4407951ba58fa ("kbuild: LLVMLinux:
>     Add Kbuild support for building kernel with Clang").
> 
> As -Wno-maybe-uninitialized requires a quite recent gcc (gcc 4.6.3 on
> Ubuntu 12.04 LTS doesn't support it), this only showed up recently (gcc
> 4.8.2 on Ubuntu 14.04 LTS does support it).
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Applied to kbuild.git#kbuild, thanks.

Michal

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