130 lines
5.8 KiB
HTML
130 lines
5.8 KiB
HTML
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<head>
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<title>The GNU Fortran Compiler: Runtime Options</title>
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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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<a name="Runtime-Options"></a>
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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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