Hello,

For this PR (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28047) most
things are already fixed.
Just one point isn't handled correct for DOS-filesystem. As
DOS-filesystem normally uses
case-insensitive path/file-names and backslash/slash as
path-separators, a comparision of
file/path-names via strcmp/strncmp isn't suitable.
I found in libiberty, that there is alread the filename_cmp function,
which handles it proper. As in
source also strncmp is used, I added to libiberty the new function
filename_ncmp, which is for
none-DOS file-systems just the strncmp function, and for DOS-case an
implementation of
strncasecmp with special handling for the path-separators.

ChangeLog gcc/

2011-02-24  Kai Tietz

	PR debug/28047
	* dwarf2out.c (file_table_eq): Use filename_cmp instead of strcmp.
	* dwarf2out.c (lookup_filename): Likewise.
	* final.c (remap_debug_filename): Use filename_ncmp instead of
	strncmp.

ChangeLog /include

2011-02-24  Kai Tietz

	* filenames.h (filename_ncmp): New prototype.

ChangeLog /libiberty

2011-02-24  Kai Tietz

	* filename_cmp.c (filename_ncmp): New function.
	* functions.texi: Regenerated.

Tested for i686-pc-mingw32, x86_64-w64-mingw32, and regression-tested
for x86_64-pc-linux-gnu. Ok for apply?

Regards,
Kai