[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 #21 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Once you are in trunk, you can ask the release managers to backport it to the
GCC 4.8 branch.