[Bug c/57653] filename information discarded when using -imacros

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57653

--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
I mean in GCC 4.9.0 (trunk), (that revision is the latest I have built).