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Message-ID: <510ECEFD.8060405@gentoo.org>
Date: Sun, 03 Feb 2013 12:56:29 -0800
From: Zac Medico <zmedico@gentoo.org>
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Subject: Re: [gentoo-dev] meaning of EROOT
References: <87wqupsljq.fsf@proton.in.awa.tohoku.ac.jp>
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On 02/03/2013 03:07 AM, heroxbd wrote:
> Dear All,
> 
> I am a bit confused with the meaning of EROOT.
> 
> In a usual Prefix installation, ROOT=/ and EPREFIX=/opt/gentoo,
> EROOT=/opt/gentoo/.
> 
> Naturally, EROOT=${EPREFIX}${ROOT}, right?

No, it's EROOT=${ROOT%/}${EPREFIX}/

> But for example in ./python.eclass
> 
>     EROOT="${ROOT%/}${EPREFIX}/"
> 
> and in LocationsManager.py of portage
> 
>     self.eroot = self.target_root.rstrip(os.sep) + self.eprefix + os.sep
> 
> What is the logic behind this construction?

ROOT corresponds to a valid chroot point. EPREFIX is an offset inside a
valid chroot point.

> The problem rises when I want to cross-compile under Prefix. Taking
> armv7a-hardfloat-linux-gnueabi for example,
> ROOT=/usr/armv7a-hardfloat-linux-gnueabi/, EPREFIX=/opt/gentoo. I'd
> expect EROOT to be ${EPREFIX}${ROOT}, therefore,
> /opt/gentoo/usr/armv7a-hardfloat-linux-gnueabi/. At present
> EROOT=/usr/armv7a-hardfloat-linux-gnueabi/opt/gentoo/, which is
> completely useless.

You've filed this bug on the same topic:

  https://bugs.gentoo.org/show_bug.cgi?id=395633

We should continue there.
-- 
Thanks,
Zac