soft float on a hard flat capable machine ?

Hi,

while building nodejs 4.1.0~dfsg-2 (not -3) it seems i can't enable
  -D__mips_soft_float
It errors out with [0]
  gnu/stubs-o32_soft.h: No such file or directory
Indeed, there is only one header in that directory.
Is it not possible to enable soft float where hard float is available ?
Is this a bug ?

Jérémy

[0]
https://buildd.debian.org/status/fetch.php?pkg=nodejs&arch=mipsel&ver=4.1.0%7Edfsg-2&stamp=1442804753