pkg/58097: iperf3 fails to build on sparc

[brandon%burn.net@localhost]

>Number:         58097
>Category:       pkg
>Synopsis:       iperf3 fails to build on sparc
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Apr 01 22:15:00 +0000 2024
>Originator:     Brandon Applegate
>Release:        10.0 + 2024Q1
>Organization:
>Environment:
NetBSD qemu-10.internal.burn.net 10.0 NetBSD 10.0 (GENERIC) #0: Thu Mar 28 08:33:33 UTC 2024  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/sparc/compile/GENERIC sparc
>Description:
When building iperf3 from pkgsrc, compilation fails on iperf_util.lo

 CC       iperf_util.lo
In file included from /usr/include/stdio.h:595,
                 from iperf_util.c:34:
iperf_util.c: In function 'get_system_info':
iperf_util.c:235:32: warning: '%s' directive output may be truncated writing up to 255 bytes into a region of size between 0 and 1020 [-Wformat-truncation=]
  235 |     snprintf(buf, sizeof(buf), "%s %s %s %s %s", uts.sysname, uts.nodename,
      |                                ^~~~~~~~~~~~~~~~
  236 |       uts.release, uts.version, uts.machine);
      |                                 ~~~~~~~~~~~
iperf_util.c:235:45: note: format string is defined here
  235 |     snprintf(buf, sizeof(buf), "%s %s %s %s %s", uts.sysname, uts.nodename,
      |                                             ^~
In file included from /usr/include/stdio.h:595,
                 from iperf_util.c:34:
iperf_util.c:235:5: note: '__builtin_snprintf' output between 5 and 1280 bytes into a destination of size 1024
  235 |     snprintf(buf, sizeof(buf), "%s %s %s %s %s", uts.sysname, uts.nodename,
      |     ^~~~~~~~
  CC       iperf_time.lo
  CC       dscp.lo
  CC       net.lo
  CC       tcp_info.lo
  CC       timer.lo
  CC       units.lo
  CCLD     libiperf.la
  CCLD     iperf3
ld: ./.libs/libiperf.so: undefined reference to `__atomic_fetch_add_8'
*** Error code 1

Stop.
make[2]: stopped in /usr/pkgsrc/net/iperf3/work/iperf-3.16/src
*** Error code 1

Stop.
make[1]: stopped in /usr/pkgsrc/net/iperf3/work/iperf-3.16/src
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/net/iperf3/work/iperf-3.16
*** Error code 1

Stop.
make[1]: stopped in /usr/pkgsrc/net/iperf3
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/net/iperf3

>How-To-Repeat:
'make install' for iperf3
>Fix: