118270 – ports/math/atlas (3.6.0_4,1) does not build with gcc 4.2.x on i386

no flags

The atlas port build fails with a misleading message about not having a
pre-2.9.6 version of gcc installed when building on a version of FreeBSD
7 or 8 where the native compiler is gcc 4.2.x.

[snip]
     /usr/bin/gcc  : v4.2.1
  F77 = /usr/local/bin/gfortran42 -O
  CC = /usr/bin/cc -fomit-frame-pointer -O -mfpmath=387 -m32
  MCC = /usr/bin/cc -fomit-frame-pointer -O -mfpmath=387 -m32

  ATLAS has detected that you are running on an x86 architecture
  (eg., Athlon, P4, PIII, etc), but do not have a pre-2.96 gcc installed.
  Using gcc 3/2.96 will result in a performance loss of 10-20% IN THE BEST CASE
  over a gcc previous to 2.96.  If your install goes slightly wrong, performance
  drops of 50% are more normal with these compilers.  Full details of this
  problem can be found at:
     http://www.cs.utk.edu/~rwhaley/ATLAS/gcc30.html
  In the meantime, we suggest you abondon this ATLAS install, and install a gcc
  that delivers decent x86 performance, and restart the install then.  You
  do not need to be root to install, and full instructions, along with all
  needed files, are given in the ATLAS errata file at:
     http://math-atlas.sourceforge.net/errata.html#UnixGccInst

     Stop ATLAS install? [y]: *** Error code 255

According to <http://math-atlas.sourceforge.net/errata3.6.0.html#gcc4>,
gcc 4.2.x should work well for building ATLAS, but 4.0.x and 4.1.x should
not be used.

Fix: Either upgrade the port to the new stable version of ATLAS (3.8.0), or
apply the following patch to the port:
How-To-Repeat: 
Attempt to build the atlas port on an i386 machine with a version of
FreeBSD that uses gcc 4.2.x as its native compiler.