linux-kernel - Re: kbuild - introduce support for subdir-ccflags-y

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Message-ID: <20090418125839.GA3668@flint.arm.linux.org.uk>
Date:	Sat, 18 Apr 2009 13:58:39 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kbuild <linux-kbuild@...r.kernel.org>,
	linux arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: kbuild - introduce support for subdir-ccflags-y

On Sat, Apr 18, 2009 at 02:51:59PM +0200, Sam Ravnborg wrote:
> The typical use cases are an architecture or a subsystem that
> decide to cover all files with -Werror.
> Today alpha, mips and sparc uses -Werror in almost all their
> Makefile - with subdir-ccflag-y it is now simpler to do so
> as only the top-level directories needs to be covered.

Hmm, this won't make sense for ARM.  We have things like #warning and
deprecated functions in machine specific headers, and adding -Werror
to the whole of arch/arm/ will result in these causing builds to fail.

Adding it just for boot,common,kernel,lib,mm,nwfpe,oprofile,vfp (iow
everything except the mach-* and plat-* directories) would make sense
though.

> The feature is added because the x86 guys are planning
> to (conditionally) cover all of arch/x86/ with -Werrror
> and adding this statement in each single Makefile
> was *the wrong way* to do so.

I think that's the way we're going to _have_ to do it on ARM.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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