[R] R and gdb

[Pierre-Andre Cornillon]

Hi,

I have some problem with setting breakpoints with gdb in order to debug
some shared library for R.
Classical use of gdb work well
gcc -g -o footest.o footest.c
gdb footest.o
b 2
run
...

but as i tried to use it with R :
$ R -d gdb
GNU gdb 5.2.1
Copyright 2002 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 "sparc64-unknown-linux-gnu"...
(gdb) R
Starting program: /usr/local/lib/R/bin/R.bin

R : Copyright 2003, The R Development Core Team
Version 1.6.2  (2003-01-10)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type `license()' or `licence()' for distribution details.

R is a collaborative project with many contributors.
Type `contributors()' for more information.

Type `demo()' for some demos, `help()' for on-line help, or
`help.start()' for a HTML browser interface to help.
Type `q()' to quit R.

[Previously saved workspace restored]

> dyn.load("foo.so")
 "I type Control-C here"
Program received signal SIGINT, Interrupt.
0x703346f8 in select () from /lib/libc.so.6
(gdb) b foo.c:44
Breakpoint 1 at 0x705c62a4: file plssvd.c, line 44.
(gdb) signal 0
Continuing with no signal.
foo.r(Xcr,Ycr,2)

gives directly the final result without stopping at the breakpoints.

I tried to update R
from 1.6.1 to 1.62
and I tried to update gdb too (up to  5.2.1, the 5.3 version doesn't
compile smoothly on my platform)
-> nothing change

my system:
Ultrasparc 10, sparc Gnu-Linux Suse 7-3, gcc 2-95-3
kernel 2.4.14 (Suse standard)

Note that setting the same breakpoint with the same program on a
Pentium IV, Gnu-Linux Suse 7-3, gcc 2-95-3
kernel 2.4.14 (Suse standard) works perfectly...

Does anybody have some hints on this topic?

Pierre-Andre Cornillon

PS I do not compile with optimization option as sometimes gdb have some
trouble to set the breakpoints at the chosen line