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| author | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
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| committer | alk3pInjection <webmaster@raspii.tech> | 2024-02-04 16:16:35 +0800 |
| commit | abdaadbcae30fe0c9a66c7516798279fdfd97750 (patch) | |
| tree | 00a54a6e25601e43876d03c1a4a12a749d4a914c /share/doc/gfortran/Interoperability-with-C.html | |
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads
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diff --git a/share/doc/gfortran/Interoperability-with-C.html b/share/doc/gfortran/Interoperability-with-C.html new file mode 100644 index 0000000..7389dc7 --- /dev/null +++ b/share/doc/gfortran/Interoperability-with-C.html @@ -0,0 +1,118 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1999-2023 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. --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>The GNU Fortran Compiler: Interoperability with C</title> + +<meta name="description" content="The GNU Fortran Compiler: Interoperability with C"> +<meta name="keywords" content="The GNU Fortran Compiler: Interoperability with C"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Option-Index.html#Option-Index" rel="index" title="Option Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Mixed_002dLanguage-Programming.html#Mixed_002dLanguage-Programming" rel="up" title="Mixed-Language Programming"> +<link href="Intrinsic-Types.html#Intrinsic-Types" rel="next" title="Intrinsic Types"> +<link href="Mixed_002dLanguage-Programming.html#Mixed_002dLanguage-Programming" rel="previous" title="Mixed-Language Programming"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Interoperability-with-C"></a> +<div class="header"> +<p> +Next: <a href="GNU-Fortran-Compiler-Directives.html#GNU-Fortran-Compiler-Directives" accesskey="n" rel="next">GNU Fortran Compiler Directives</a>, Up: <a href="Mixed_002dLanguage-Programming.html#Mixed_002dLanguage-Programming" accesskey="u" rel="up">Mixed-Language Programming</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Interoperability-with-C-1"></a> +<h3 class="section">6.1 Interoperability with C</h3> +<a name="index-interoperability-with-C"></a> +<a name="index-C-interoperability"></a> + +<table class="menu" border="0" cellspacing="0"> +<tr><td align="left" valign="top">• <a href="Intrinsic-Types.html#Intrinsic-Types" accesskey="1">Intrinsic Types</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Derived-Types-and-struct.html#Derived-Types-and-struct" accesskey="2">Derived Types and struct</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Interoperable-Global-Variables.html#Interoperable-Global-Variables" accesskey="3">Interoperable Global Variables</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Interoperable-Subroutines-and-Functions.html#Interoperable-Subroutines-and-Functions" accesskey="4">Interoperable Subroutines and Functions</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Working-with-C-Pointers.html#Working-with-C-Pointers" accesskey="5">Working with C Pointers</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +<tr><td align="left" valign="top">• <a href="Further-Interoperability-of-Fortran-with-C.html#Further-Interoperability-of-Fortran-with-C" accesskey="6">Further Interoperability of Fortran with C</a>:</td><td> </td><td align="left" valign="top"> +</td></tr> +</table> + +<p>Since Fortran 2003 (ISO/IEC 1539-1:2004(E)) there is a +standardized way to generate procedure and derived-type +declarations and global variables that are interoperable with C +(ISO/IEC 9899:1999). The <code>BIND(C)</code> attribute has been added +to inform the compiler that a symbol shall be interoperable with C; +also, some constraints are added. Note, however, that not +all C features have a Fortran equivalent or vice versa. For instance, +neither C’s unsigned integers nor C’s functions with variable number +of arguments have an equivalent in Fortran. +</p> +<p>Note that array dimensions are reversely ordered in C and that arrays in +C always start with index 0 while in Fortran they start by default with +1. Thus, an array declaration <code>A(n,m)</code> in Fortran matches +<code>A[m][n]</code> in C and accessing the element <code>A(i,j)</code> matches +<code>A[j-1][i-1]</code>. The element following <code>A(i,j)</code> (C: <code>A[j-1][i-1]</code>; +assuming <em>i < n</em>) in memory is <code>A(i+1,j)</code> (C: <code>A[j-1][i]</code>). +</p> + + + +</body> +</html> |