Hi all:

I am building a cross-compiling toolchain. In the process, my makefile builds a 
number of libraries that GCC needs. GMP is one of them.

I ran "make check" once, and self-test t-get_d_2exp is failing:

mpz_get_d_2exp wrong on 2**54-1
result out of range, expect 0.5 <= got < 1.0
   rnd_mode = 0
   data[i]  = 54
   z    =0x3FFFFFFFFFFFFF
   got  =[00 00 00 00 00 00 F0 3F] 1
   got exp  54
FAIL t-get_d_2exp (exit status: 134)

Other tests run fine.

Is this problem already known? Is it worth pursuing? I can provide more 
information on demand.

These are the versions I am building at the moment:

  BINUTILS_VERSION := 2.32
  GMP_VERSION := 6.1.2
  MPFR_VERSION := 4.0.2
  MPC_VERSION := 1.1.0
  GCC_VERSION := 8.3.0
  NEWLIB_VERSION := 3.1.0
  GDB_VERSION := 8.3

The whole thing runs on an Ubuntu 18.04.2 system. This PC is a few years old 
and I have not noticed anything wrong with it yet.

I am building the toolchain with -O3 and LTO at the moment.

Best regards,
  rdiez
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