Hi everyone.
I'm trying to learn my way around the R internals.  I've gone pretty much as
far as I can go with the information given in Writing R Extensions and R
Internals, but I still have a lot of questions, too many in fact to post
them to the r-devel list.  But I think I could answer many of these if I
could just step through R's execution during some basic operations.

What I'd like to do is generate a simple R script, e.g.:

# foo.R
foo <- list(x=1, y=2, z=3)
print(foo)


...and then using gdb step through R's execution of this script.

I have two questions.

First, where in the R source would be a good place to set a breakpoint so
that I can then step through the execution of such a script?

Second, breakpoints aside, how can I even get R to run such a script under
gdb?

For the latter I tried this:

% myR/bin/R -q --vanilla --debugger=gdb --file=foo.R
GNU gdb 6.6-debian
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) c
The program is not being run.
(gdb) r
Starting program: /d0/home/jones/local/pub/work/proj/myR/lib64/R/bin/exec/R
-q --vanilla --file=foo.R
/d0/home/jones/local/pub/work/proj/myR/lib64/R/bin/exec/R: error while
loading shared libraries: libR.so: cannot open sy

Program exited with code 0177.
(gdb)


What am I doing wrong?

BTW, the version on R I have under myR has been compiled with the -g flag
set.

TIA!

kynn

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