[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 #12 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Allan McRae from comment #11)
> Created attachment 30345 [details]
> log of gdb session
> 
> Here is the log from my gdb session.
> 
> Arch builds with no patches, just a could of small sed lines that should not
> affect this.  See our build script (plain bash):
> https://projects.archlinux.org/svntogit/packages.git/tree/trunk/
> PKGBUILD?h=packages/gcc

Does it do a full bootstrap? My gdb session looks more optimized than yours.
Perhaps it is a bug in the host compiler?

My version also does not ever execute this:

Breakpoint 1, linemap_add (set=0x7ffff7ff9000, reason=LC_ENTER, sysp=2,
    to_file=0x140e270 "/usr/include/stdc-predef.h", to_line=1)
    at /build/gcc-git/src/gcc/libcpp/line-map.c:291

In fact, I don't have this file.
manuel@gcc10:~$ cat /etc/debian_version 
6.0.6

so the presence of the file may make a difference (unfortunately, I don't have
root access to gcc10 to fake the file and test).