[Bug 209412] math/openblas SEGFAULT during build on AMD64 BARCELONA and BULLDOZER

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209412

            Bug ID: 209412
           Summary: math/openblas SEGFAULT during build on AMD64 BARCELONA
                    and BULLDOZER
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
               URL: https://github.com/xianyi/OpenBLAS/issues/786
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: cy at FreeBSD.org
                CC: phd_kimberlite at yahoo.co.jp, pi at FreeBSD.org
                CC: phd_kimberlite at yahoo.co.jp
             Flags: maintainer-feedback?(phd_kimberlite at yahoo.co.jp)

Created attachment 170165
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170165&action=edit
This patch circumvents the problem by disabling stack checking.

Builds on i386 architecture and builds on amd64 using Intel processors build
fine whereas builds on amd64 architecture using AMD CPUs (BARCELONA and
BULLDOZER) still fail.

This discusses the problem: https://github.com/xianyi/OpenBLAS/issues/786.
Unfortunately it doesn't discuss a fix, my builds on my BARCELONA processor
still fail. The attached patch does workaround the problem but I don't think
it's suitable for inclusion in ports.

Note the port builds properly on the BARCELONA and BULLDOZER CPUs in i386
(32-bit) mode but SEGFAULTS in amd64 (64-bit) mode. The port builds
successfully on the Intel Sandy Bridge CPU in both modes (i386 and amd64).

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