Re: RFC: Adding VxWorks PIC support to various backends

[Richard Sandiford <richard at codesourcery dot com>]

Ian Lance Taylor <iant@google.com> writes:
> Richard Sandiford <richard@codesourcery.com> writes:
>>   1) Wrap it in #ifdef TARGET_VXWORKS_RTP.
>> 
>>   2) Provide an always-false definition of TARGET_VXWORKS_RTP in
>>      arm.h, i386.h, etc.  Also provide dummy definitions of the
>>      VXWORKS_GOTT_* macros.
>> 
>>   3) Provide an always-false definition of TARGET_VXWORKS_RTP in
>>      defaults.h.  Also provide dummy definitions of the VXWORKS_GOTT_*
>>      macros.
>> 
>>   4) Like (3), but provide the real VxWorks default values of the
>>      VXWORKS_GOTT_* macros (rather than dummy ones).
>
> Provide an always-false definition of TARGET_VXWORKS_RTP in arm.h,
> i386.h, etc.  Define the other macros in config/vxworks.h.  Add
> vxworks.h to config.gcc for the appropriate targets.

OK.  If I've understood you correctly, the difference between that
and (2) is that you wouldn't have the dummy definitions of the
VXWORKS_GOTT_* macros in arm.h, etc.  Is that right?

So by appropriate targets, do you mean all arm, i386, etc. targets?
It's just that if there are no definitions of the VXWORKS_GOTT_* macros,
you'll get a compilation error.

Richard