RETITLED/edited/shorter: Building lang/gcc14 fails only on main [so: 15], works on 14.2-Release and 14.2-Stable, why?

[I've also dropped mmel@ from the To: list.]

Why does building lang/gcc14 work on each of:

14.1-Release
14.2-Release
14.2-Stable

but not on main [so: 15]?

Only main has armv7 lang/gcc14* build failures
on the official builders. Seems odd if it is just
lang/gcc1[45]* 's problem.

main gets a failure where the config.log shows
that it found but rejected a hidden symbol:

configure:3479:  /wrkdirs/usr/ports/lang/gcc14/work/.build/./prev-gcc/xgcc -B/wrkdirs/usr/ports/lang/gcc14/work/.build/./prev-gcc/ -B/usr/local/armv7-portbld-freebsd15.0/bin/ -B/usr/local/armv7-portbl
d-freebsd15.0/bin/ -B/usr/local/armv7-portbld-freebsd15.0/lib/ -isystem /usr/local/armv7-portbld-freebsd15.0/include -isystem /usr/local/armv7-portbld-freebsd15.0/sys-include   -fno-checking -o confte
st -g -O2 -fno-checking -gtoggle -mcpu=cortex-a7 -DLIBICONV_PLUG -static-libstdc++ -static-libgcc  conftest.c  >&5
/usr/local/bin/ld: warning: libunwind.o: missing .note.GNU-stack section implies executable stack
/usr/local/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
/usr/local/bin/ld: conftest: hidden symbol `__aeabi_unwind_cpp_pr0' in /wrkdirs/usr/ports/lang/gcc14/work/.build/./prev-gcc/libgcc_eh.a(unwind-arm.o) is referenced by DSO
/usr/local/bin/ld: final link failed: bad value
collect2: error: ld returned 1 exit status

Per mmel@: Note the -static-libgcc is involved,
something that only happens for lang/gcc1[45]* .
(This explains lang/gcc13 building on main.)

Official 14.1R builder success logs include:

https://pkg-status.freebsd.org/ampere3/data/141releng-armv7-default/a66c1b68c862/logs/gcc14-14.2.0_3.log

---Begin OPTIONS List---
===> The following configuration options are available for gcc14-14.2.0_3:
   GRAPHITE=off: Support for Graphite loop optimizations
====> Options available for the radio BOOTSTRAP: you can only select none or one of them
   LTO_BOOTSTRAP=off: Build using a full LTO bootstrap
   STANDARD_BOOTSTRAP=on: Build using a full bootstrap without LTO
===> Use 'make config' to modify these settings
---End OPTIONS List---

https://pkg-status.freebsd.org/ampere3/data/141releng-armv7-default/a66c1b68c862/logs/gcc14-devel-14.2.1.s20250308,1.log

---Begin OPTIONS List---
===> The following configuration options are available for gcc14-devel-14.2.1.s20250308,1:
   GRAPHITE=off: Support for Graphite loop optimizations
====> Options available for the single BOOTSTRAP: you have to select exactly one of them
   LTO_BOOTSTRAP=off: Build using a full LTO bootstrap
   STANDARD_BOOTSTRAP=on: Build using a full bootstrap without LTO
===> Use 'make config' to modify these settings
---End OPTIONS List---

Note: armv7 has not had much build time in 2025-Apr so far, thus
the lack of 14.2R examples.


And local builds via:

release-armv7    14.2-RELEASE-p2           armv7         pkgbase 2025-03-13 21:50:17 /usr/local/poudriere/jails/release-armv7

[01:58:58] [01] [01:34:53] Finished   lang/gcc14 | gcc14-14.2.0_3: Success

and via:

official-armv7   14.2-STABLE               armv7         pkgbase 2025-03-13 21:47:04 /usr/local/poudriere/jails/official-armv7

[01:53:58] [01] [01:32:13] Finished   lang/gcc14 | gcc14-14.2.0_3: Success

work as well.

The failing context on main has (involving a grep for
lines of interest):

File: /wrkdirs/usr/ports/lang/gcc14/work/.build/prev-gcc/libgcc_eh.a(unwind-arm.o)
000000f8 00002f1a R_ARM_GOT_BREL      00000c30 __aeabi_unwind_cpp_pr2
000000fc 0000301a R_ARM_GOT_BREL      00000c28 __aeabi_unwind_cpp_pr1
  46: 0000000000000c20     8 FUNC    GLOBAL HIDDEN     1 __aeabi_unwind_cpp_pr0
  47: 0000000000000c30     8 FUNC    WEAK   HIDDEN     1 __aeabi_unwind_cpp_pr2
  48: 0000000000000c28     8 FUNC    WEAK   HIDDEN     1 __aeabi_unwind_cpp_pr1

That looks the same as what is install by the working
builds on:

14.1-Release
14.2-Release
14.2-Stable

The official build logs show the following also
fail --just on main:

lang/gcc14-devel
lang/gcc15-devel

===
Mark Millard
marklmi at yahoo.com