bug 47775 (need to upgrade gcc version > 4.8 for octave 4.2) ?

[Tatsuro MATSUOKA]

Today I have built 4.1.0+ on Ubuntu 14.04 amd64 (gcc 4.8.4).

Two FAILs were detected

Summary:

  PASS     14146
  FAIL         2
  XFAIL       30
  SKIPPED     43

>>>>> processing 
>>>>> /home/tatsuro/work/octave/octave-hg/build/libinterp/corefcn/sparse-xpow.cc-tst
***** assert (sparse (2i) .^ [3, 4], sparse ([-0-8i, 16]))
!!!!! test failed
ASSERT errors for:  assert (sparse (2i) .^ [3, 4],sparse ([-0 - 8i, 16]))

  Location  |  Observed  |  Expected  |  Reason
    (1)      -1.46958e-15-8i     0-8i       Abs err 2.3054e-15 exceeds tol 0
    (2)      16-3.91887e-15i    16+0i       Abs err 4.3027e-15 exceeds tol 0


>>>>> processing 
>>>>> /home/tatsuro/work/octave/octave-hg/octave/scripts/specfun/realpow.m
***** assert (realpow (1i,2), -1)
!!!!! test failed
realpow: produced complex result


Those seem to be known issues and originate from the bug of gcc below 4.9.

https://savannah.gnu.org/bugs/?47775


The tracker means that gcc version later than 4.9 should be used for upcoming 
version 4.2.

Tatsuro