[Rd] Debug an R windows (Fortran) DLL within R with gdb?

[Duncan Murdoch]

On 17/09/2014, 11:52 PM, Andre Mikulec wrote:
> Help,
> 
> My Rgui.exe, main.f, main.o, and main.dll are all in the same directory.
> When I try to set a breakpoint, I get this response
> 
> (gdb) b main.f:3               
> No source file named main.f
> 
> I tried the -gdwarf-2 requirement in both the compiling and linking statements.  This did not fix the problem.
> The cygwin site recommended the -g option.  I tried this.  This did not fix the problem.


This is getting to be a question about gdb, and I'm no expert on that.
I do remember there's a command "dir" which says where to find source;
perhaps that is necessary even when the working directory holds the source.


> I did not use R CMD SHLIB ( I ran the statements manually ).

I don't recommend that.  You can add options to R CMD SHLIB, but you are
likely to run into problems with R if you leave any out.

DUncan Murdoch

> 
> Andre Mikulec
> Andre_Mikulec at Hotmail.com
> 
> 
> ----------------------------------------
>> From: r-devel-request at r-project.org
>> Subject: R-devel Digest, Vol 139, Issue 15
>> To: r-devel at r-project.org
>> Date: Tue, 16 Sep 2014 12:00:06 +0200
>>
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>> Today's Topics:
>>
>> 1. Debug an R windows (Fortran) DLL within R with gdb?
>> (Andre Mikulec)
>> 2. Re: Debug an R windows (Fortran) DLL within R with gdb?
>> (Duncan Murdoch)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Mon, 15 Sep 2014 17:25:49 -0400
>> From: Andre Mikulec <andre_mikulec at hotmail.com>
>> To: "r-devel at r-project.org" <r-devel at r-project.org>
>> Subject: [Rd] Debug an R windows (Fortran) DLL within R with gdb?
>> Message-ID: <BLU174-W2834A37215473FEE12D3F39CC80 at phx.gbl>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>>
>> Hi,?
>> I have a Fortran 77 subroutine (dll).
>>
>> On windows XP, how ?would I 'debug it(Fortran) within R' using gdb?
>>
>> This is how I made it.
>> ----------------------
>>
>> R CMD SHLIB main.f
>>
>> gfortran -m32 ? ? -O3 ?-mtune=core2 -c main.f -o main.o
>>
>> gcc -m32 -shared -s -static-libgcc -o main.dll tmp.def main.o -Ld:/RCompile/CRANpkg/extralibs64/local/lib/i386 -Ld:/RCompile/CRANpkg/extralibs64/local/lib -lgfortran -LF:/ProgramFiles/R/R-3.1.1/bin/i386 -lR
>>
>>
>> Here is the contents of the file ?main.f
>> -----------------------------------------
>>
>> ? ? ? SUBROUTINE NGCD(NA, NB, NGCDO)?
>> ? ? ? ? IA = NA
>> ? ? ? ? IB = NB
>> ? ? 1 ? IF (IB.NE.0) THEN
>> ? ? ? ? ? ITEMP = IA
>> ? ? ? ? ? IA = IB
>> ? ? ? ? ? IB = MOD(ITEMP, IB)
>> ? ? ? ? ? GOTO 1
>> ? ? ? ? END IF
>> ? ? ? ? NGCDO = IA ?
>> ? ? ? ? RETURN
>> ? ? ? END
>>
>> Thank you,
>> Andre Mikulec
>> Andre_Mikulec at Hotmail.com
>>
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Mon, 15 Sep 2014 18:05:36 -0400
>> From: Duncan Murdoch <murdoch.duncan at gmail.com>
>> To: Andre Mikulec <andre_mikulec at hotmail.com>, "r-devel at r-project.org"
>> <r-devel at r-project.org>
>> Subject: Re: [Rd] Debug an R windows (Fortran) DLL within R with gdb?
>> Message-ID: <541762B0.1050501 at gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> On 15/09/2014, 5:25 PM, Andre Mikulec wrote:
>>>
>>> Hi,
>>> I have a Fortran 77 subroutine (dll).
>>>
>>> On windows XP, how would I 'debug it(Fortran) within R' using gdb?
>>>
>>> This is how I made it.
>>> ----------------------
>>>
>>> R CMD SHLIB main.f
>>>
>>> gfortran -m32 -O3 -mtune=core2 -c main.f -o main.o
>>>
>>> gcc -m32 -shared -s -static-libgcc -o main.dll tmp.def main.o -Ld:/RCompile/CRANpkg/extralibs64/local/lib/i386 -Ld:/RCompile/CRANpkg/extralibs64/local/lib -lgfortran -LF:/ProgramFiles/R/R-3.1.1/bin/i386 -lR
>>>
>>>
>>> Here is the contents of the file main.f
>>> -----------------------------------------
>>>
>>> SUBROUTINE NGCD(NA, NB, NGCDO)
>>> IA = NA
>>> IB = NB
>>> 1 IF (IB.NE.0) THEN
>>> ITEMP = IA
>>> IA = IB
>>> IB = MOD(ITEMP, IB)
>>> GOTO 1
>>> END IF
>>> NGCDO = IA
>>> RETURN
>>> END
>>
>> I don't think you put in any compile options to include symbolic
>> information. You need to do that. I think the option you want is
>> -gdwarf-2, but I rarely use Fortran, and never use SHLIB, so I could be
>> wrong. I'll assume you can figure out how to do that.
>>
>> Run R under gdb using
>>
>> gdb Rgui
>>
>> Load your DLL.
>>
>> Break to gdb using the menu entry "Misc | Break to debugger".
>>
>> Set a breakpoint, e.g.
>>
>> b main.f:3
>>
>> to set it on line 3. Then use c to let R continue, and make a call to
>> your code. Then the usual gdb commands will work after it breaks.
>>
>> Duncan Murdoch
>>
>>
>>
>> ------------------------------
>>
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>>
>> End of R-devel Digest, Vol 139, Issue 15
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