Message-ID: <476EE3C0.9080005@cimr.cam.ac.uk>
Date: 2007-12-23T22:40:00Z
From: Hin-Tak Leung
Subject: Problem with dyn.load'ed code
In-Reply-To: <1198431855.9564.10.camel@calder-linux>
You are missing some extern "C" declarations? R needs C linkage style.
Basically a lot of:
extern "C" {
}
around your c++ code.
Matt Calder wrote:
> Hi,
> I am having trouble with some code that I am dyn.loading. I am
> writing an interface to ARPACK. I compile my interface (dssimp.cc), and
> link it against the ARPACK library (libarpack_SUN4.a):
>
> g++ -shared -static -fPIC dssimp.cc -o dssimp.so -larpack_SUN4 -lg2c -lm
>
> I can dyn.load the code and it appears OK. However, when I call my
> function, the call to the function in the ARPACK library returns an
> error.
> I can print the arguments to my function when I call it from R, so I
> can see that I am dyn.load'd, and the arguments are passed correctly.
> Moreover, I can load and call the shared object (dssimp.so) using
> dlopen and dlsym from a stand alone C++ program. So I can see that the
> shared object is OK.
> In summary, I have a shared object that works correctly outside of R,
> but when dyn.load'd into R, does not work. Short of calling errors
> (which is not the case here) I wonder how that might happen, and how I
> might fix it?
>
> Matt
>
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