Can't specify output file

Bfc in installed from aur.
bfc a.bf -> success
bfc -o a a.bf -> Error "a: file not recognized: File truncated"

[ultrabear]

I get the same type of error but my error is

$ bfc -o file.f literally_anything.bf
Assembler messages:
Fatal error: The input 'file.f' and output 'file.f' files are the same
ld: warning: cannot find entry symbol _start; not setting start address