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| <h3 class="section">2.8 Influencing runtime behavior</h3> |
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| <p><a name="index-options_002c-runtime-225"></a> |
| These options affect the runtime behavior of programs compiled with GNU Fortran. |
| |
| <dl> |
| <dt><code>-fconvert=</code><var>conversion</var><dd><a name="index-g_t_0040code_007bfconvert_003d_007d_0040var_007bconversion_007d-226"></a>Specify the representation of data for unformatted files. Valid |
| values for conversion are: ‘<samp><span class="samp">native</span></samp>’, the default; ‘<samp><span class="samp">swap</span></samp>’, |
| swap between big- and little-endian; ‘<samp><span class="samp">big-endian</span></samp>’, use big-endian |
| representation for unformatted files; ‘<samp><span class="samp">little-endian</span></samp>’, use little-endian |
| representation for unformatted files. |
| |
| <p><em>This option has an effect only when used in the main program. |
| The </em><code>CONVERT</code><em> specifier and the GFORTRAN_CONVERT_UNIT environment |
| variable override the default specified by </em><samp><span class="option">-fconvert</span></samp><em>.</em> |
| |
| <br><dt><code>-frecord-marker=</code><var>length</var><dd><a name="index-g_t_0040code_007bfrecord_002dmarker_003d_007d_0040var_007blength_007d-227"></a>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 </em><samp><span class="command">gfortran</span></samp>, |
| 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 <samp><span class="command">gfortran</span></samp>, use <samp><span class="option">-frecord-marker=8</span></samp>. |
| |
| <br><dt><code>-fmax-subrecord-length=</code><var>length</var><dd><a name="index-g_t_0040code_007bfmax_002dsubrecord_002dlength_003d_007d_0040var_007blength_007d-228"></a>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. |
| |
| <br><dt><code>-fsign-zero</code><dd><a name="index-g_t_0040code_007bfsign_002dzero_007d-229"></a>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><span class="option">-fno-sign-zero</span></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><span class="option">-fsign-zero</span></samp>. |
| </dl> |
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