[Dev-C++] Mixed Language Programming w/Dev-Cpp

[Scott W. <se...@al...>]

Hi,

Wondering if anyone has experience with mixed language programming and
whether it can be done with Dev-Cpp?

In particular, I'm writing a mathematical simulation in C (using Dev-Cpp)
and would like to make using of some existing numerical routines in Fortran.
My C knowledge is necessity-based self-taught and so limited; don't know
anything about Fortran.  Neither do I know much about using
compilers/linkers/etc in command line mode (which is why I use Dev-Cpp--I
let it worry about that stuff).

Still, I know that built-in to the gcc interface is the g77 compiler so
there must be a way to compile the fortran source to an object with g77 and
then link to & call the routines from C.  Could it be as simple as added
fortran source files to my Dev-Cpp project?  If so, any thoughts on how to
prototype the Fortran functions & subfunctions to make them accessible to
the C calling routines?

BTW, I've tried f2c but have been unable to make that work.  That approach
is suboptimal anyway because the resulting C code is far less efficient than
the original Fortran source.

Perhaps specifics would help.  The fortran code I'm trying to use is a
single file ode.f  The entry point is the subroutine ode.  Here's how the
file is laid out:

// ode.f

      subroutine ode(f,neqn,y,t,tout,relerr,abserr,iflag,work,iwork)
      implicit real*8(a-h,o-z)

c      f -- double precision subroutine f(t,y,yp) to evaluate
c                derivatives yp(i)=dy(i)/dt
c      neqn -- number of equations to be integrated (integer*4)
c      y(*) -- solution vector at t                 (real*8)
c      t -- independent variable                    (real*8)
c      tout -- point at which solution is desired   (real*8)
c      relerr,abserr -- relative and absolute error tolerances for local
c           error test (real*8).  at each step the code requires
c             dabs(local error) .le. dabs(y)*relerr + abserr
c           for each component of the local error and solution vectors
c      iflag -- indicates status of integration     (integer*4)
c      work(*)  (real*8)  -- arrays to hold information internal to
c      iwork(*) (integer*4)    which is necessary for subsequent calls

. . . ode calls de:
      subroutine de(f,neqn,y,t,tout,relerr,abserr,iflag,
     1  yy,wt,p,yp,ypout,phi,alpha,beta,sig,v,w,g,phase1,psi,x,h,hold,
     2  start,told,delsgn,ns,nornd,k,kold,isnold)
      implicit real*8(a-h,o-z)

. . . de calls step & intrp:
      subroutine step(x,y,f,neqn,h,eps,wt,start,
     1  hold,k,kold,crash,phi,p,yp,psi,
     2  alpha,beta,sig,v,w,g,phase1,ns,nornd)
      implicit real*8(a-h,o-z)

      subroutine intrp(x,y,xout,yout,ypout,neqn,kold,phi,psi)
      implicit real*8(a-h,o-z)
// end ode.f

The derivative function f is written in C (and that's where I was having
probs with the f2c route).

All help is appreciated (sorry for the long post).

Scott