[Bug mi/15472] New: Printing of "fullname" when the file is missing is causing problems for Eclipse

["dje at google dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15472

             Bug #: 15472
           Summary: Printing of "fullname" when the file is missing is
                    causing problems for Eclipse
           Product: gdb
           Version: 7.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mi
        AssignedTo: unassigned@sourceware.org
        ReportedBy: dje@google.com
    Classification: Unclassified


We have a bug report where a user is seeing the following:

Can't find a source file at "/foo/bar/baz.cc"
Locate the file or edit the source lookup path to include its location.

The sources are in a different location from where they were originally
compiled when this happens.
The change in behaviour from 7.5 to 7.6 is that the output now includes
"fullname" even if the file isn't found, and I think(!) this is what causes
Eclipse trouble.

Repro:
[I'm using -fdebug-prefix-map and "b main" as a hack.  The real example does
something different.]

cd $HOME
gcc -g -fdebug-prefix-map=$HOME=. hello.c
cd /tmp
gdb -i=mi2 $HOME/a.out
[...]
b main
&"b main\n"
~"Breakpoint 1 at 0x4004f8: file hello.c, line 6.\n"
=breakpoint-created,bkpt={number="1",type="breakpoint",disp="keep",enabled="y",addr="0x00000000004004f8",func="main",file="hello.c",fullname="./hello.c",line="6",thread-groups=["i1"],times="0",original-location="main"}
^done
(gdb)

With 7.5 the "fullname" field is elided and Eclipse uses the "file" field to
find hello.c. [Eclipse has its own source search path.]

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