<html lang="en"> <head> <title>Extensions not implemented in GNU Fortran - 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="Extensions.html#Extensions" title="Extensions"> <link rel="prev" href="Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran" title="Extensions implemented in GNU Fortran"> <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="Extensions-not-implemented-in-GNU-Fortran"></a> <p> Previous: <a rel="previous" accesskey="p" href="Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran">Extensions implemented in GNU Fortran</a>, Up: <a rel="up" accesskey="u" href="Extensions.html#Extensions">Extensions</a> <hr> </div> <h3 class="section">6.2 Extensions not implemented in GNU Fortran</h3> <p><a name="index-extensions_002c-not-implemented-324"></a> The long history of the Fortran language, its wide use and broad userbase, the large number of different compiler vendors and the lack of some features crucial to users in the first standards have lead to the existence of a number of important extensions to the language. While some of the most useful or popular extensions are supported by the GNU Fortran compiler, not all existing extensions are supported. This section aims at listing these extensions and offering advice on how best make code that uses them running with the GNU Fortran compiler. <!-- More can be found here: --> <!-- http://gcc.gnu.org/onlinedocs/gcc-3.4.6/g77/Missing-Features.html --> <!-- the list of Fortran and libgfortran bugs closed as WONTFIX: --> <!-- http://tinyurl.com/2u4h5y --> <ul class="menu"> <li><a accesskey="1" href="STRUCTURE-and-RECORD.html#STRUCTURE-and-RECORD">STRUCTURE and RECORD</a> <!-- * UNION and MAP:: --> <li><a accesskey="2" href="ENCODE-and-DECODE-statements.html#ENCODE-and-DECODE-statements">ENCODE and DECODE statements</a> <li><a accesskey="3" href="Variable-FORMAT-expressions.html#Variable-FORMAT-expressions">Variable FORMAT expressions</a> <!-- * Q edit descriptor:: --> <!-- * AUTOMATIC statement:: --> <!-- * TYPE and ACCEPT I/O Statements:: --> <!-- * .XOR. operator:: --> <!-- * CARRIAGECONTROL, DEFAULTFILE, DISPOSE and RECORDTYPE I/O specifiers:: --> <!-- * Omitted arguments in procedure call:: --> <li><a accesskey="4" href="Alternate-complex-function-syntax.html#Alternate-complex-function-syntax">Alternate complex function syntax</a> </ul> </body></html>