Compiling for ARMv8-A Using GCC 7.2.0 - Assertion error in gen-fac

[Torbjörn Granlund]

nisse at lysator.liu.se (Niels Möller) writes:

  > I was able to narrow down the cause.  In GC 7.2.0 the GMP_LLIMB_MASK is wrong:
  >
  > =GCC 4.8.5=
  > GMP_LIMB_BITS=64
  > GMP_LLIMB_MASK=4294967295=0xFFFFFFFF
  >
  > =GCC 7.2.0=
  > GMP_LIMB_BITS=64
  > GMP_LLIMB_MASK=1=0x00000001
  >
  > From my understanding this might be a difference in how GCC 7.2.0
  > handles unsigned longs vs GCC 4.8.5.  It also could be I am missing
  > some vital compiler flag for GMP.

  Can you file a gcc bug? These constants are defined as

  #define GMP_LIMB_BITS (sizeof(mp_limb_t) * CHAR_BIT)    /* 64, you say */

  #define GMP_HLIMB_BIT ((mp_limb_t) 1 << (GMP_LIMB_BITS / 2))
  #define GMP_LLIMB_MASK (GMP_HLIMB_BIT - 1)

  I see no reasonable way that can end up defining GMP_LLIMB_MASK as 1.

The first thing to try might be gcc 7.4, which was the final gcc 7
release.

-- 
Torbjörn
Please encrypt, key id 0xC8601622