Re: [PATCH] Fix PR target/8340

[Eric Botcazou <ebotcazou at libertysurf dot fr>]

> This is OK, but not for mainline, only for b-i-b.  It will introduce
> regressions in ports that (wrongly) don't define
> PIC_OFFSET_TABLE_REGNUM to be INVALID_REGNUM when not using PIC.  In
> particular, I see that MIPS, ia64, and alpha all define
> PIC_OFFSET_TABLE_REGNUM unconditionally.

Isn't that purposely ? There are these line in flow.c:

#ifndef PIC_OFFSET_TABLE_REG_CALL_CLOBBERED
  /* Many architectures have a GP register even without flag_pic.
     Assume the pic register is not in use, or will be handled by
     other means, if it is not fixed.  */
  if (PIC_OFFSET_TABLE_REGNUM != INVALID_REGNUM
      && fixed_regs[PIC_OFFSET_TABLE_REGNUM])
    SET_REGNO_REG_SET (set, PIC_OFFSET_TABLE_REGNUM);
#endif

-- 
Eric Botcazou