Illegal instruction on NanoPI NEO / Bookworm

[skazi0]

After upgrading my NanoPI NEO from Bullseye to Bookworm and rebuilding tfrec it started failing with "Illegal instruction".

Trace from gdb:

Thread 1 "tfrec" received signal SIGILL, Illegal instruction.
0x004068fe in whb_demod::demod(int, int, int, short*) ()
(gdb) bt
#0  0x004068fe in whb_demod::demod(int, int, int, short*) ()
#1  0x00404b44 in fsk_demod::process(short*, int) ()
#2  0x004042c6 in engine::run(int) ()
#3  0x00403aa8 in main ()

On Bullseye I had:

$ gcc -march=native -Q --help=target | grep mfpu
  -mfpu=                      		vfpv3-d16

On Bookworm:

$ gcc -march=native -Q --help=target | grep mfpu
  -mfpu=                      		auto

I got it working by changing from -mfpu=crypto-neon-fp-armv8 to -mfpu=auto under # RPi 3/4 32Bit / ifeq ($(ARCH), armv7l).