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

[allan at archlinux dot org]

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

--- Comment #6 from Allan McRae <allan at archlinux dot org> ---
I have also confirmed this issue on Fedora rawhide.

gcc 4.8.1 20130603 (Red Hat 4.8.1-1)