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From: Rich Felker <dalias@aerifal.cx>
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Subject: Re: Out-of-tree builds
Date: Thu, 6 Feb 2014 20:07:55 -0500
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On Fri, Feb 07, 2014 at 02:01:36AM +0100, Szabolcs Nagy wrote:
> +dirhack:
> +	mkdir -p $(sort $(dir $(OBJS))) crt include lib tools

How does this avoid having the $(M) source root from $(OBJS)?

>  include/bits:
>  	@test "$(ARCH)" || { echo "Please set ARCH in config.mak before running make." ; exit 1 ; }
> -	ln -sf ../arch/$(ARCH)/bits $@
> +	ln -sf ../$(M)/arch/$(ARCH)/bits $@

Having ../ prior to a possibly-absolute path $(M) seems wrong.

Rich