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Date: Wed, 09 May 2012 15:34:00 -0000
From: Matthias Klose <doko@ubuntu.com>
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To: Paolo Bonzini <bonzini@gnu.org>
CC: "Joseph S. Myers" <joseph@codesourcery.com>,  GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [patch] support for multiarch systems
References: <4E501045.40102@ubuntu.com> <4FA8711D.3030507@ubuntu.com> <Pine.LNX.4.64.1205081315110.6367@digraph.polyomino.org.uk> <4FA9BC73.3080009@ubuntu.com> <4FAA730E.9020608@gnu.org>
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On 09.05.2012 15:37, Paolo Bonzini wrote:
> Il 09/05/2012 02:38, Matthias Klose ha scritto:
>> Index: gcc/doc/invoke.texi
>> ===================================================================
>> --- gcc/doc/invoke.texi	(revision 187271)
>> +++ gcc/doc/invoke.texi	(working copy)
>> @@ -6110,6 +6110,11 @@
>>  @file{../lib32}, or if OS libraries are present in @file{lib/@var{subdir}}
>>  subdirectories it prints e.g.@: @file{amd64}, @file{sparcv9} or @file{ev6}.
>>  
>> +@item -print-multiarch
>> +@opindex print-multiarch
>> +Print the path to OS libraries for the selected multiarch,
>> +relative to some @file{lib} subdirectory.
>> +
>>  @item -print-prog-name=@var{program}
>>  @opindex print-prog-name
>>  Like @option{-print-file-name}, but searches for a program such as @samp{cpp}.
> 
> So -print-multiarch is like --print-multi-os-directory?

the former prints the part before the `:' in the MULTILIB_OSDIRNAMES, the latter
the part after the `':', e.g. ../lib32 and i386-linux-gnu.

> What is the difference, and where is it documented?

Not sure how it should be further documented.

> Should it fail if multiarch support is not compiled in?

All the -print options always succeed. I would prefer if it just prints the
empty string if it is not configured (as it does now).

  Matthias