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Re: -B vs Multilib

From: Jim Wilson <wilson at tuliptree dot org>
To: Greg Schafer <gschafer at zip dot com dot au>
Cc: gcc at gcc dot gnu dot org
Date: Mon, 17 Mar 2008 09:20:32 -0700
Subject: Re: -B vs Multilib
References: <20080312114448.GA19638@eyo32.local>

Greg Schafer wrote:

Currently, -B doesn't add the multilib search paths when processing
startfile_prefixes. For example, -B $prefix/lib/ doesn't find startfiles in
$prefix/lib/../lib64

GCC has two different schemes for multilib search dirs. One that is used in the gcc build tree, and one that is used in the OS install dirs. See the difference between multilib_dir and multilib_os_dir.

We are doing multilib searches for startfile_prefix. See find_file. However, we are using the gcc build tree form. This is necessary because -B options are used during the gcc build.

Perhaps what you need is to make -B options work both ways, so that they are also useful when pointing into OS dirs like /lib. Or maybe we need yet another option which is like -B but meant to be used in OS dirs instead of in the gcc build tree.

Jim

References:
- -B vs Multilib
  - From: Greg Schafer

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