linux-kernel - Re: 2.6.22-rc4-mm2: kvm compile breakage with X86

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Message-ID: <20070612032224.GA19293@redhat.com>
Date:	Mon, 11 Jun 2007 23:22:24 -0400
From:	Dave Jones <davej@...hat.com>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, avi@...ranet.com,
	linux-kernel@...r.kernel.org, kvm-devel@...ts.sourceforge.net
Subject: Re: 2.6.22-rc4-mm2: kvm compile breakage with X86_CMPXCHG64=n

On Tue, Jun 12, 2007 at 02:07:18AM +0200, Adrian Bunk wrote:
 
 > I'm getting the following compile error with CONFIG_X86_CMPXCHG64=n 
 > (with -Werror-implicit-function-declaration - otherwise it would be a 
 > link error):

We really should just get that flag into mainline so that it breaks
for people before they submit patches.  We run into this constantly.


Add -Werror-implicit-function-declaration
This makes builds fail sooner if something is implicitly defined instead
of having to wait half an hour for it to fail at the linking stage.

Signed-off-by: Dave Jones <davej@...hat.com>

--- linux-2.6/Makefile~	2007-06-04 16:46:24.000000000 -0400
+++ linux-2.6/Makefile	2007-06-04 16:46:53.000000000 -0400
@@ -313,7 +313,8 @@ LINUXINCLUDE    := -Iinclude \
 CPPFLAGS        := -D__KERNEL__ $(LINUXINCLUDE)
 
 CFLAGS          := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
-                   -fno-strict-aliasing -fno-common
+		   -fno-strict-aliasing -fno-common \
+		   -Werror-implicit-function-declaration
 AFLAGS          := -D__ASSEMBLY__
 
 # Read KERNELRELEASE from include/config/kernel.release (if it exists)

-- 
http://www.codemonkey.org.uk
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