[Bug 262208] science/py-pymol: build hangs compiling ov/src/OVHeapArray.cpp

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262208

            Bug ID: 262208
           Summary: science/py-pymol: build hangs compiling
                    ov/src/OVHeapArray.cpp
           Product: Ports & Packages
           Version: Latest
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: yuri@freebsd.org
          Reporter: fuz@fuz.su
             Flags: maintainer-feedback?(yuri@freebsd.org)
          Assignee: yuri@freebsd.org
 Attachment #232123 text/plain
         mime type:

Created attachment 232123
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=232123&action=edit
science/py-pymol@py38 2.4.0_3 build log on armv7 FreeBSD 13

When building this port for armv7 FreeBSD 13 with Poudriere on an aarch64
machine (no emulation, no native cross tools), the build proceeds as normal but
then hangs at this command:

c++ -O2 -pipe -fstack-protector-strong -fno-strict-aliasing -std=c++11 -fPIC
-D_PYMOL_LIBPNG -D_PYMOL_FREETYPE -D_PYMOL_VMD_PLUGINS -D_HAVE_LIBXML
-DMMTF_MSGPACK_USE_CPP11 -D_PYMOL_NO_MAIN -D_PYMOL_NUMPY -Iinclude
-Icontrib/uiuc/plugins/include -Iov/src -Ilayer0 -Ilayer1 -Ilayer2 -Ilayer3
-Ilayer4 -Ilayer5 -Imodules/cealign/src -Ibuild/generated
-Icontrib/uiuc/plugins/molfile_plugin/src -Icontrib/mmtf-c
-I/usr/local/lib/python3.8/site-packages/numpy/core/include
-I/usr/local/include -I/usr/local/include/freetype2
-I/usr/local/include/libxml2 -I/usr/local/include/python3.8 -c -MMD
ov/src/OVHeapArray.cpp -o
build/temp.freebsd-13.0-RELEASE-p4-arm-3.8/ov/src/OVHeapArray.o
-Werror=return-type -Wunused-variable -Wno-switch -Wno-narrowing
-Wno-char-subscripts -O3

Inspection of the process table shows the C++ compiler running at 100% CPU
until it gets mercy killed after 6 hours of no progress with my configuration.

Attached is a sample build log.  I was able to reproduce this multiple times
with the same result.

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