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Help with boost1.74

Dear Debian ARM people,
last boost1.74 version (1.74.0-12) fails to build on armhf[1], and I suspect the failure is caused by the switch to GCC 11, because it didn't happen in the version before (compiled with GCC 10).
[1] https://buildd.debian.org/status/fetch.php?pkg=boost1.74&arch=armhf&ver=1.74.0-12&stamp=1635842472&raw=0 

The problem seems to be this:
---
jump_arm_aapcs_elf_gas.S: Assembler messages:
jump_arm_aapcs_elf_gas.S:57: Error: selected processor does not support `vstmia sp,{d8-d15}' in ARM mode jump_arm_aapcs_elf_gas.S:68: Error: selected processor does not support `vldmia sp,{d8-d15}' in ARM mode 
---
I have little knowledge of the ARM architecture: why those instructions are not valid any more? Or simply they were ignored with GCC 10? They are gated by these defines: 
---
#if (defined(__VFP_FP__) && !defined(__SOFTFP__))
    @ save S16-S31
    vstmia sp, {d8-d15}
#endif
---

For reference, the failing file is [2].
[2] https://sources.debian.org/src/boost1.74/1.74.0-12/libs/context/src/asm/jump_arm_aapcs_elf_gas.S/ 

Thanks for your help, Giovanni.

(please Cc: in replies)
--
Giovanni Mascellani <g.mascellani@gmail.com>
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