[build] Move unwinder to toplevel libgcc

[Paolo Bonzini]

On 06/29/2011 12:41 PM, Joseph S. Myers wrote:
> On Wed, 29 Jun 2011, Paolo Bonzini wrote:
>
>> On 06/20/2011 02:24 PM, Rainer Orth wrote:
>>> * The only unwinder-related macro I haven't moved is
>>>     LIBGCC2_UNWIND_ATTRIBUTE.  It is only defined gcc/config/mips/mips.h.
>>>     I suppose we would need a libgcc equivalent of tm.h for that,
>>>     something I didn't want to attack at this point.
>>
>> Something like the attached?
>
> This patch appears to create a *second* file called libgcc_tm.h, so there
> is one created in gcc/ and one in libgcc/, which seems incredibly
> confusing.  By all means move the libgcc_tm.h logic to libgcc/ (though
> tm.h will need to continue to include libgcc_tm.h for the target, until
> the transition away from tm.h target macros in target code is complete and
> code includes libgcc_tm.h directly instead), but don't have two headers
> with the same name in different build directories.

Yes, the patch was not complete and only meant to be the plumbing for 
what you describe.

I think Rainer missed the existence of libgcc_tm_file. :)

Paolo