I think I have found a bug. This is in stock gcc 4.8.1... My backend does not use the 'enabled' attribute; therefore the following code in insn-attr.h kicks in:
#ifndef HAVE_ATTR_enabled
#define HAVE_ATTR_enabled 0
#endif
Therefore the following code in gcc/lra-constraints.c is enabled:
#ifdef HAVE_ATTR_enabled
if (curr_id->alternative_enabled_p != NULL
&& ! curr_id->alternative_enabled_p[nalt])
continue;
#endif
->alternative_enabled_p is bogus; therefore segfault.
Elsewhere I see structures of the form:
#if HAVE_ATTR_enabled
...
#endif
So I think that #ifdef above is a straight typo. Certainly, changing it
to a #if makes the crash go away...
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