lang/gcc14-devel fails to build for armv7: "You must select one and only one option from the BOOTSTRAP single"

For example,

https://lists.freebsd.org/archives/freebsd-pkg-fallout/2024-September/652126.html

reports:

---Begin OPTIONS List---
====> You must select one and only one option from the BOOTSTRAP single
=====> No option was selected (and one must be)
*** Error code 1

Stop.
make: stopped making "showconfig" in /usr/ports/lang/gcc14-devel

. . .

=======================<phase: check-sanity >============================
===== env: NO_DEPENDS=yes USER=root UID=0 GID=0
Making GCC 14.2.1.s20240831 for armv7-portbld-freebsd15.0 [c,c++,objc,fortran,jit]
===> License GPLv3 GPLv3RLE accepted by the user
====> You must select one and only one option from the BOOTSTRAP single
=====> No option was selected (and one must be)
*** Error code 1

Stop.
make: stopped making "check-sanity" in /usr/ports/lang/gcc14-devel


For reference:

It looks like this goes back to 2024-May or before, for all of:

140releng-armv7-quarterly
140releng-armv7-default
132releng-armv7-quarterly
132releng-armv7-default

(For other reasons over this time, until recently, builds of
main-armv7-default never completed the overall "bulk -a".
But main-armv7-default shows 2 recent examples, starting when
the armv7 jails on ampere2 were updated to a vintage that had
the fix for that more overall problem for main.)

===
Mark Millard
marklmi at yahoo.com