gacy Fortran</a>), this direct interface
offers many advantages, especially compile-time type-checking and
aligned memory allocation.  As of this writing, support for these C
interoperability features seems widespread, having been implemented in
nearly all major Fortran compilers (e.g. GNU, Intel, IBM,
Oracle/Solaris, Portland Group, NAG).
<a name="index-portability-4"></a>
</p>
<p>This chapter documents that interface.  For the most part, since this
interface allows Fortran to call the C interface directly