I think I finally got the root cause and the stage1 compiler is crunching
through the files without ICE, albeit very slowly :-) It was a bug in gcc,
here are my notes:
in gcc/defaults.h:
/* Assume that case vectors are not pc-relative. */
#ifndef CASE_VECTOR_PC_RELATIVE
#define CASE_VECTOR_PC_RELATIVE 0
#endif
this is included after the target definitions and thus overrides the nextstep.h
target definition which includes:
#undef CASE_VECTOR_PC_RELATIVE
the code then subsequently breaks in gcc/config/m68k/m68k.md:
#ifdef CASE_VECTOR_PC_RELATIVE
operands[0] = gen_rtx_PLUS (SImode, pc_rtx,
gen_rtx_SIGN_EXTEND (SImode, operands[0]));
#endif
this conditional is always true because of the define in gcc/defaults.h, and
needs to be replaced by:
#if CASE_VECTOR_PC_RELATIVE != 0
operands[0] = gen_rtx_PLUS (SImode, pc_rtx,
gen_rtx_SIGN_EXTEND (SImode, operands[0]));
#endif
I will report the bug to GCC's Bugzilla.
A HUGE thank you once again to everyone for your help with this!
On 2012-05-23, at 3:21 AM, Andreas Schwab wrote:
> t-rexky <[email protected]> writes:
>
>> #undef CASE_VECTOR_PC_RELATIVE
>
> That is missing.
>
> Andreas.
>
> --
> Andreas Schwab, [email protected]
> GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
> "And now for something completely different."
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