> On 3/04/2012, at 2:16 AM, Ilya Enkovich wrote:
>>> The point is that one can build a toolchain for i686-linux-gnu that will 
>>> support both 32-bit and 64-bit multilibs.  The 32-bit multilib will be used 
>>> by default, and compilation for 64-bit user-space can be requested with 
>>> -m64 option.  Even though Android is not supported for -m64, such a 
>>> toolchain can support Android as a additional "-m32 -mandroid" multilib.  
>>> I.e., the toolchain will have three multilibs in total: "-m32" (default), 
>>> "-m64" and "-m32 -mandroid".  I386/linux64.h will be picked up for such a 
>>> toolchain, even though by default it would compile for 32-bit target.  Does 
>>> this clear up things?
>> I think I see your point. And it seems to make all this work I'll also
>> have to rename i386/gnu-user.h into i386/gnu-user32.h and create
>> i386/gnu-user.h with common definitions to be included by
>> gnu-user[32|64].h. Otherwise I wont be able to use some definitions
>> linux64.h. Right?
> It's simpler that you think.  The target headers ($tm_file in config.gcc -- 
> gnu-user.h, linux*.h, etc. in this case) are all included into tm.h, which 
> serves as proxy to all those headers.  All definitions made in preceding 
> headers are available in subsequent headers.  So, given that i386/gnu-user*.h 
> precedes i386/linux*.h in config.gcc's $tm_file, you only need to touch 
> linux*.h.
> Thanks,
> --
> Maxim Kuvyrkov
> CodeSourcery / Mentor Graphics


I prepared version with common linux.h and gnu-user.h. Does it look OK?

Bootstrapped and checked on linux-x86_64.

2012-04-03  Enkovich Ilya  <ilya.enkov...@intel.com>

        * config/i386/linux.h: Renamed to ...
        * config/i386/linux32.h: ... this.

        * config/i386/gnu-user.h: Renamed to ...
        * config/i386/gnu-user32.h: ... this.
        (CPP_SPEC): Remove.
        (CC1_SPEC): Remove.
        (ENDFILE_SPEC): Remove.

        * config.gcc: Rename i386/linux.h to i386/linux32.h and
        i386/gnu-user.h to i386/gnu-user32.h.

        * config/i386/linux.h: New.

        * config/i386/gnu-user.h: New.

        * config/i386/linux64.h: Include i386/linux.h.

        * config/i386/gnu-user64.h: Include i386/gnu-user.h
        (CPP_SPEC): Remove.
        (CC1_SPEC): Remove.
        (ENDFILE_SPEC): Remove.

Attachment: mandroid.patch
Description: Binary data

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