From murdoch at stats.uwo.ca  Fri Sep  9 12:39:30 2005
From: murdoch at stats.uwo.ca (Duncan Murdoch)
Date: Fri, 09 Sep 2005 06:39:30 -0400
Subject: [Rd] [R] Debugging R/Fortran in Windows
In-Reply-To: <3095.192.168.65.113.1126245320.squirrel@homebase.wehi.edu.au>
References: <3095.192.168.65.113.1126245320.squirrel@homebase.wehi.edu.au>
Message-ID: <43216662.7010802@stats.uwo.ca>

[Moved from R-help]

James Wettenhall wrote:
> Hi,
> 
> I'm trying to debug an R interface to a Fortran subroutine from Windows. 
> (Yes, I know I should try Unix/Linux as well, but a quick attempt
> suggested that the (MinGW g77) Fortran compiler I have installed on my
> Windows laptop works better on this Fortran code.)
> 
> I'm trying to follow the instructions in the "Writing R Extensions" Manual:
> 
> Start R under the debugger after setting a breakpoint for WinMain.
>           gdb .../bin/Rgui.exe
>           (gdb) break WinMain
>           (gdb) run
> 
> But when I run gdb on Rgui.exe, I get the message:
> "no debugging symbols found"
> and then when I try "break WinMain", I get:
> "No symbol table is loaded.  use the 'file' command."

You can also start R normally, load your dll by attaching the package, 
then click on Misc | Break to debugger.

This assumes you have debugging symbols in your DLL, and have gdb set up 
properly; see

http://www.stats.uwo.ca/faculty/murdoch/software/debuggingR

for more details.

Duncan Murdoch
> 
> I'm using R 2.1.1 on Windows 2000 and gdb 5.2.1 from MSys's MinGW.
> 
> I'm calling a Fortran function (several times) from R.  And I seem to have
> the basic two-way data communication working - I appear to have
> succesfully passed all required data types (integer, real, double
> precision) to and from Fortran with sensible results both from within R
> and from using WRITE(FILENUM,*) from within Fortran.  But unfortunately
> there is still evidence of memory leakage.
> 
> Any suggestions would be greatly appreciated.
> 
> Regards,
> James
> 
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[Rd] [R] Debugging R/Fortran in Windows
Duncan Murdoch