Follow-up Comment #8, patch #9543 (project avr-libc):
There must still be missing something, at least _PROTECTED_WRITE_SPM. Apart
from a build warning for a missing prototype, it's neither resolved by a macro
nor my a symbol:
$ echo 'int main(){}' | avr-gcc -xc - -Wl,-u,eeprom_write_block
-mmcu=attiny1616
/srv/local/gnu/install/gcc-8/bin/../lib/gcc/avr/8.0.1/../../../../avr/lib/avrxmega3/libattiny1616.a(eewr_block_xmega.o):
In function `eeprom_write_block':
eewr_block_xmega.c:(.text.avr-libc+0x80): undefined reference to
`_PROTECTED_WRITE_SPM'
collect2: error: ld returned 1 exit status
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