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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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| <a name="Influencing-runtime-behavior"></a> |
| <h3 class="section">2.8 Influencing runtime behavior</h3> |
| <a name="index-options_002c-runtime"></a> |
| |
| <p>These options affect the runtime behavior of programs compiled with GNU Fortran. |
| </p> |
| <dl compact="compact"> |
| <dt><code>-fconvert=<var>conversion</var></code></dt> |
| <dd><a name="index-fconvert_003dconversion"></a> |
| <p>Specify the representation of data for unformatted files. Valid |
| values for conversion are: ‘<samp>native</samp>’, the default; ‘<samp>swap</samp>’, |
| swap between big- and little-endian; ‘<samp>big-endian</samp>’, use big-endian |
| representation for unformatted files; ‘<samp>little-endian</samp>’, use little-endian |
| representation for unformatted files. |
| </p> |
| <p><em>This option has an effect only when used in the main program. |
| The <code>CONVERT</code> specifier and the GFORTRAN_CONVERT_UNIT environment |
| variable override the default specified by <samp>-fconvert</samp>.</em> |
| </p> |
| </dd> |
| <dt><code>-frecord-marker=<var>length</var></code></dt> |
| <dd><a name="index-frecord_002dmarker_003dlength"></a> |
| <p>Specify the length of record markers for unformatted files. |
| Valid values for <var>length</var> are 4 and 8. Default is 4. |
| <em>This is different from previous versions of <code>gfortran</code></em>, |
| which specified a default record marker length of 8 on most |
| systems. If you want to read or write files compatible |
| with earlier versions of <code>gfortran</code>, use <samp>-frecord-marker=8</samp>. |
| </p> |
| </dd> |
| <dt><code>-fmax-subrecord-length=<var>length</var></code></dt> |
| <dd><a name="index-fmax_002dsubrecord_002dlength_003dlength"></a> |
| <p>Specify the maximum length for a subrecord. The maximum permitted |
| value for length is 2147483639, which is also the default. Only |
| really useful for use by the gfortran testsuite. |
| </p> |
| </dd> |
| <dt><code>-fsign-zero</code></dt> |
| <dd><a name="index-fsign_002dzero"></a> |
| <p>When enabled, floating point numbers of value zero with the sign bit set |
| are written as negative number in formatted output and treated as |
| negative in the <code>SIGN</code> intrinsic. <samp>-fno-sign-zero</samp> does not |
| print the negative sign of zero values (or values rounded to zero for I/O) |
| and regards zero as positive number in the <code>SIGN</code> intrinsic for |
| compatibility with Fortran 77. The default is <samp>-fsign-zero</samp>. |
| </p></dd> |
| </dl> |
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