%ifidn __YASM_OBJFMT__ doesnt work ?

[Mike Frysinger]

am i doing something wrong here ?
$ cat test.asm
%ifidn __YASM_OBJFMT__,elf
elf
%endif
%ifidn __YASM_OBJFMT__,elf32
elf32
%endif
%ifidn __YASM_OBJFMT__,elf64
elf64
%endif

$ yasm -f elf -e test.asm
<nothing!>

similar syntax has always worked fine for me in nasm:
%ifidn __OUTPUT_FORMAT__,elf
<stuff>
%endif
-mike