Re: Call Array valued Fortran function from C

> But you should ask the gfortran folks if they can round up some
> do***entation about gfortran array descriptors for you.  They are
> different in every compiler.

Yep, that's on the TODO list. Here's the short version (in C syntax).

The descriptor for a given type (named here TYPE) is then:

struct {
  TYPE *data;
  size_t offset;
  ssize_t dtype;
  descriptor_dimension dim[7];
}

where descriptor_dimension is defined as

typedef struct descriptor_dimension
{
  ssize_t stride;
  ssize_t lbound;
  ssize_t ubound;
}
descriptor_dimension;

All fields have the meaning implied by their name, and dtype is such that:

  * (dtype & 0x07) is the rank
  * (dtype >> 6) is the size of an array element

The data component points to the first element in the array.  The offset
field is the position of the element (0, 0, ...). An element is accessed
by data[offset + index0*stride0 + index1*stride1 + ...]


All this information and more can be found in the big comment in the
source at gcc/fortran/trans-types.c, line 949 in the current sources.

-- 
FX