As discussed in thread 
http://sources.redhat.com/ml/gdb-patches/2006-10/msg00090.html
about the TUI that did not display windows source files,

I propose a patch that treats source files where end-of-line are '\r' only.

The struct symtab fulfilled by find_source_lines was wrong, the field 
nlines was set to 1.
Therefore these files can not be open in the TUI for instance.

Denis