Date: Wed, 14 Sep 2005 18:49:53 +0200
From: Sam Ravnborg <sam@ravnborg.org>
To: rmk+lkml@arm.linux.org.uk
Cc: linux-kernel@vger.kernel.org
Subject: Re: kbuild-permanently-fix-kernel-configuration-include-mess.patch added to -mm tree
Message-ID: <20050914164953.GA7480@mars.ravnborg.org>
References: <200509140841.j8E8fG1w022954@shell0.pdx.osdl.net>
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>  # Use LINUXINCLUDE when you must reference the include/ directory.
>  # Needed to be compatible with the O= option
>  LINUXINCLUDE    := -Iinclude \
> -                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include)
> +                   $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
> +		   -imacros include/linux/autoconf.h
>  
What is the purpose of using -imacros instead of -iinclude

o -iinclude is much more commonly used for this purpose.
o sparse has limited support(*) for -iinclude today
o -imacros will silently ignore any output caused by the file

	Sam
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