[R] Step by step: Making an R package with Fortran 95
murdoch at stats.uwo.ca
Fri May 22 15:37:07 CEST 2009
On 5/22/2009 8:18 AM, sjnovick wrote:
> To all. I need your help. The big question is: How do I make an R library
> with Fortran 95 files? You may assume that I am a pretty decent programmer
> in both R and Fortran. I lay out a scenario and need your help!
> I know how to make an ordinary R package and have dabbled with R + Fortran
> 95 *.dll linking. I do not have a great handle on the whole Makevars file
> and whatever else I might need to get things working to build a new R
> package. By the way, I'm using R 2.8.1 and Windows XP (and sometimes
> Let's take this simple situation. Suppose I'm using Windows XP and place
> the Folder for the package "Testme" in C:\Program
I'd put your own files in their own directory, rather than in the R
source tree. But this shouldn't have caused your error...
> Files and folders:
> DESCRIPTION file -- I understand this file
> NAMESPACE file: This one has the contents
> man directory: I put my *.Rd files here. I understand this part.
> R directory: I put my *.R files here. One of these files calls upon a
> Fortran 95 subroutine with
> .Fortran("MySubroutine", var1=as.double(x),
> var2=as.double(y), etc.)
> I understand this part.
> src directory: I put my *.f95 files here. Also, I put a Makevars file
What is in Makevars? You don't need this unless you're doing something
special. In your case, you might be, see below.
> Suppose that I have two *.f95 files, named CalculatorModule.f95 and
> CalculatorModule.f95 contains a Fortran 95 module.
> ANiceSubroutine.f95 uses the functions in
> Calculator.Module.f95 with the "USE" command. To be consistent with my R
> file (above), ANiceSubroutine.f95 contains the subroutine: "MySubroutine".
> Finally: I issue the command from a DOS Shell in the directory C:\Program
> make pkg-Testme
> This results in errors.
> Here are the problems:
> 1. The order of compilation must be f95 -c CalculatorModule.f95
> ANiceSubroutine.f95. Unfortunately, R compiles them alphabetically. So, I
> was given errors making the *.o files.
You could put the dependency
ANiceSubroutine.o: ANiceSubroutine.f95 CalculatorModule.o
into your Makevars file, but see the instructions in Writing R
Extensions if you add targets there.
> I overcame this problem by renaming the files
> a01.CalculatorModule.f95 and a02.ANiceSubroutine.f95. I would rather not
> have to name the files this way if I don't have to! When I did this, R
> compiled the Fortran files in the correct order, but I still have errors.
> 2. Here was the error output. Help?????
> C:\Program Files\R\R-2.8.1\src\gnuwin32>make pkg-Testme
> ---------- Making package Testme ------------
> adding build stamp to DESCRIPTION
> installing NAMESPACE file and metadata
> making DLL ...
> "g95" -O3 -c a01.CalculatorMod.f95 -o a01.CalculatorMod.o
> "g95" -O3 -c a02.ANiceSubroutine.f95 -o a02.ANiceSubroutine.o
> windres --preprocessor="gcc -E -xc -DRC_INVOKED" -I
> de -i Testme_res.rc -o Testme_res.o
> "g95" -shared -s -o Testme.dll Testme.def a01.CalculatorMod.o
> Testme_res.o -LC:/PROGRA~1/R/R-28~1.1/bin -lR
> ld: Testme.def:6: syntax error
> ld:Testme.def: file format not recognized; treating as linker script
> ld:Testme.def:2: syntax error
> make: *** [Testme.dll] Error 1
> make: *** [srcDynlib] Error 2
> make: *** [all] Error 2
> make: *** [pkg-Testme] Error 2
Did you create the Testme.def file? What is in it?
> Thanks for helping!!! :)
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