Here is a link to the gdb bug:

http://sourceware.org/bugzilla/show_bug.cgi?id=14081

I tried running file-list-exec-source-files and I get duplicates as well. Try the following:

prompt> echo -file-list-exec-source-files > /tmp/gdb.in
prompt> gdb -i=mi emacs < /tmp/gdb.in > /tmp/gdb.out
prompt> perl -ne 'while(/(\w+)=\"(.*?)\"/g) { print "$1=$2\n"; }' /tmp/gdb.out | sort | head -15
file=alloc.c
file=alloc.c
file=allocator.c
file=atimer.c
file=atimer.c
file=bidi.c
file=bidi.c
file=buffer.c
file=buffer.c
file=buffer.h
file=buffer.h
file=buffer.h
file=buffer.h
file=buffer.h
file=buffer.h

My version of gdb is:

GNU gdb (GDB) Fedora (7.2-52.fc14)

For my executable gdb outputs full paths as well as the fullname field, which expands the output considerably.

Still, it bothering me the fact that the above perl expression parses the gdb output in a fraction of a second, (0.01s user time) whereas gdb-mi.el takes more than 40s.

Regards,
Dov