130 lines
5.8 KiB
HTML
130 lines
5.8 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1999-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>The GNU Fortran Compiler: Runtime Options</title>
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<meta name="description" content="The GNU Fortran Compiler: Runtime Options">
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<meta name="keywords" content="The GNU Fortran Compiler: Runtime Options">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Invoking-GNU-Fortran.html#Invoking-GNU-Fortran" rel="up" title="Invoking GNU Fortran">
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<link href="Code-Gen-Options.html#Code-Gen-Options" rel="next" title="Code Gen Options">
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<link href="Link-Options.html#Link-Options" rel="prev" title="Link Options">
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Runtime-Options"></a>
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<div class="header">
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<p>
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Next: <a href="Code-Gen-Options.html#Code-Gen-Options" accesskey="n" rel="next">Code Gen Options</a>, Previous: <a href="Link-Options.html#Link-Options" accesskey="p" rel="prev">Link Options</a>, Up: <a href="Invoking-GNU-Fortran.html#Invoking-GNU-Fortran" accesskey="u" rel="up">Invoking GNU Fortran</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>
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</div>
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<hr>
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<a name="Influencing-runtime-behavior"></a>
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<h3 class="section">2.8 Influencing runtime behavior</h3>
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<a name="index-options_002c-runtime"></a>
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<p>These options affect the runtime behavior of programs compiled with GNU Fortran.
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</p>
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<dl compact="compact">
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<dt><code>-fconvert=<var>conversion</var></code></dt>
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<dd><a name="index-fconvert_003dconversion"></a>
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<p>Specify the representation of data for unformatted files. Valid
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values for conversion are: ‘<samp>native</samp>’, the default; ‘<samp>swap</samp>’,
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swap between big- and little-endian; ‘<samp>big-endian</samp>’, use big-endian
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representation for unformatted files; ‘<samp>little-endian</samp>’, use little-endian
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representation for unformatted files.
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</p>
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<p><em>This option has an effect only when used in the main program.
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The <code>CONVERT</code> specifier and the GFORTRAN_CONVERT_UNIT environment
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variable override the default specified by <samp>-fconvert</samp>.</em>
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</p>
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</dd>
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<dt><code>-frecord-marker=<var>length</var></code></dt>
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<dd><a name="index-frecord_002dmarker_003dlength"></a>
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<p>Specify the length of record markers for unformatted files.
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Valid values for <var>length</var> are 4 and 8. Default is 4.
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<em>This is different from previous versions of <code>gfortran</code></em>,
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which specified a default record marker length of 8 on most
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systems. If you want to read or write files compatible
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with earlier versions of <code>gfortran</code>, use <samp>-frecord-marker=8</samp>.
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</p>
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</dd>
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<dt><code>-fmax-subrecord-length=<var>length</var></code></dt>
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<dd><a name="index-fmax_002dsubrecord_002dlength_003dlength"></a>
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<p>Specify the maximum length for a subrecord. The maximum permitted
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value for length is 2147483639, which is also the default. Only
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really useful for use by the gfortran testsuite.
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</p>
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</dd>
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<dt><code>-fsign-zero</code></dt>
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<dd><a name="index-fsign_002dzero"></a>
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<p>When enabled, floating point numbers of value zero with the sign bit set
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are written as negative number in formatted output and treated as
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negative in the <code>SIGN</code> intrinsic. <samp>-fno-sign-zero</samp> does not
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print the negative sign of zero values (or values rounded to zero for I/O)
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and regards zero as positive number in the <code>SIGN</code> intrinsic for
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compatibility with Fortran 77. The default is <samp>-fsign-zero</samp>.
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</p></dd>
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</dl>
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</body>
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</html>
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