<html lang="en"> <head> <title>Further Interoperability of Fortran with C - The GNU Fortran Compiler</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="The GNU Fortran Compiler"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Interoperability-with-C.html#Interoperability-with-C" title="Interoperability with C"> <link rel="prev" href="Working-with-Pointers.html#Working-with-Pointers" title="Working with Pointers"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being ``Funding Free Software'', the Front-Cover Texts being (a) (see below), and with the Back-Cover Texts being (b) (see below). A copy of the license is included in the section entitled ``GNU Free Documentation License''. (a) The FSF's Front-Cover Text is: A GNU Manual (b) The FSF's Back-Cover Text is: You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="Further-Interoperability-of-Fortran-with-C"></a> <p> Previous: <a rel="previous" accesskey="p" href="Working-with-Pointers.html#Working-with-Pointers">Working with Pointers</a>, Up: <a rel="up" accesskey="u" href="Interoperability-with-C.html#Interoperability-with-C">Interoperability with C</a> <hr> </div> <h4 class="subsection">7.1.6 Further Interoperability of Fortran with C</h4> <p>Assumed-shape and allocatable arrays are passed using an array descriptor (dope vector). The internal structure of the array descriptor used by GNU Fortran is not yet documented and will change. There will also be a Technical Report (TR 29113) which standardizes an interoperable array descriptor. Until then, you can use the Chasm Language Interoperability Tools, <a href="http://chasm-interop.sourceforge.net/">http://chasm-interop.sourceforge.net/</a>, which provide an interface to GNU Fortran's array descriptor. <p>The technical report 29113 will presumably also include support for C-interoperable <code>OPTIONAL</code> and for assumed-rank and assumed-type dummy arguments. However, the TR has neither been approved nor implemented in GNU Fortran; therefore, these features are not yet available. </body></html>