Re: How to use ddd with other debuggers

[Andreas Zeller]

Hi!

Van Snyder <address@hidden> writes:

> I have the Lahey/Fujitsu Fortran compiler.  It comes with a non-gnu
> text-only debugger.  It doesn't use the usual Linux format of
> debugger-table information.
> 
> Where do I start to learn how to hook this debugger to ddd?  I didn't
> see anything in the ddd manual about this (but then, I only read
> the table of contents, and suggestive sections, not the whole manual).
> 
> I have the NAG Fortran compiler.  It uses the standard Linux format of
> debugger-table information.  I can run its programs in gdb and ddd.
> The problem is that NAG puts an underscore on the end of every name in
> the debugger's table.  Also, being Fortran, names are case insensitive.
> Also, being Fortran, the structure reference operator in the source
> text is "%", not ".".  The NAG compiler produces some extra debugging
> information tables, in addition to the usual Linux ones and in a separate
> file, so that their own brain-dead non-gnu debugger can cope with the
> advanced features of Fortran that have no counterpart in C.
> 
> Where do I start to learn how to tune ddd to work with this compiler?

Simple.  Convince the compiler vendor to support GDB or vice versa :-)

Seriously: Unfortunately, there is no out-of-the box way to hook a new
debugger into DDD.  This always requires a lot of coding, as DDD is
quite interwoven with the underlying command-line debugger.  I don't
have the time to adapt DDD to new debuggers (I'm busy enough
maintaining the current ones), so you're probably stuck.  As an
alternative, consider GVD (http://libre.act-europe.fr/gvd/), which may
be more extensible than DDD.

Regarding the Fortran problems with DDD/GDB (insensitive case names,
appended underscores), try `set language fortran' at the GDB prompt;
DDD should then automatically `fortranize' names.  The enclosed patch
may help with accessing Fortran structure members.

Good luck,

Andreas

Index: DispValue.C
===================================================================
RCS file: /cvsroot/ddd/ddd/ddd/DispValue.C,v
retrieving revision 1.121
diff -c -r1.121 DispValue.C
*** DispValue.C 2000/12/20 12:30:24     1.121
--- DispValue.C 2001/03/07 11:43:02
***************
*** 545,550 ****
--- 545,555 ----
                member_prefix = normalize_base(member_prefix) + "{'";
                member_suffix = "'}";
            }
+           else if (gdb->program_language() == LANGUAGE_FORTRAN)
+           {
+               // In Fortran, members of A are accessed as A%B
+               member_prefix = normalize_base(member_prefix) + "%";
+           }
            else
            {
                // In all other languages, members are accessed as A.B

-- 
Andreas Zeller     Universitaet Passau
                   http://www.fmi.uni-passau.de/st/staff/zeller/