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Message-Id: <1156440307.3012.165.camel@pmac.infradead.org> Date: Thu, 24 Aug 2006 18:25:07 +0100 From: David Woodhouse <dwmw2@...radead.org> To: Arnd Bergmann <arnd.bergmann@...ibm.com> Cc: devel@...top.org, Jan Engelhardt <jengelh@...ux01.gwdg.de>, linux-tiny@...enic.com, linux-kernel@...r.kernel.org Subject: Re: [OLPC-devel] Re: [PATCH 0/4] Compile kernel with -fwhole-program --combine On Thu, 2006-08-24 at 19:15 +0200, Arnd Bergmann wrote: > It's probably true, but the way it's done today gave us CONFIG_MODVERSIONS > and EXPORT_SYMBOL_GPL, which would break when turning EXPORT_SYMBOL into a > simple __attribute__(). ELF can do symbol versioning too. But I don't really see a simple way to make normal ELF linking work with a kernel like that. The vmlinux ELF file is long gone by the time the kernel boots -- it needs its own mechanism for managing its symbols anyway; its own internal dynamic linker. I suppose you _could_ make it work from the standard ELF linkage but I don't think it'd be fun. ObMODVERSIONS: Forgot to mention that my makefile hacks for --combine break that completely. It tries to preprocess all the files together with 'gcc -E -D__GENKSYMS__ *.c' -- and you can't do that. -- dwmw2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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