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<title>The GNU Fortran Compiler: _gfortran_set_options</title>
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<p>
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Next: <a href="_005fgfortran_005fset_005fconvert.html#g_t_005fgfortran_005fset_005fconvert" accesskey="n" rel="next">_gfortran_set_convert</a>, Previous: <a href="_005fgfortran_005fset_005fargs.html#g_t_005fgfortran_005fset_005fargs" accesskey="p" rel="prev">_gfortran_set_args</a>, Up: <a href="Non_002dFortran-Main-Program.html#Non_002dFortran-Main-Program" accesskey="u" rel="up">Non-Fortran Main Program</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="g_t_005fgfortran_005fset_005foptions-_002d_002d_002d-Set-library-option-flags"></a>
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<h4 class="subsection">7.3.2 <code>_gfortran_set_options</code> — Set library option flags</h4>
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<a name="index-_005fgfortran_005fset_005foptions"></a>
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<a name="index-libgfortran-initialization_002c-set_005foptions"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>_gfortran_set_options</code> sets several flags related to the Fortran
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standard to be used, whether backtracing should be enabled
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and whether range checks should be performed. The syntax allows for
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upward compatibility since the number of passed flags is specified; for
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non-passed flags, the default value is used. See also
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see <a href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a>. Please note that not all flags are actually
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used.
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>void _gfortran_set_options (int num, int options[])</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>num</var></td><td width="70%">number of options passed</td></tr>
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<tr><td width="15%"><var>argv</var></td><td width="70%">The list of flag values</td></tr>
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</table>
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</dd>
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<dt><em>option flag list</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>option</var>[0]</td><td width="70%">Allowed standard; can give run-time errors
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if e.g. an input-output edit descriptor is invalid in a given standard.
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Possible values are (bitwise or-ed) <code>GFC_STD_F77</code> (1),
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<code>GFC_STD_F95_OBS</code> (2), <code>GFC_STD_F95_DEL</code> (4), <code>GFC_STD_F95</code>
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(8), <code>GFC_STD_F2003</code> (16), <code>GFC_STD_GNU</code> (32),
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<code>GFC_STD_LEGACY</code> (64), <code>GFC_STD_F2008</code> (128),
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<code>GFC_STD_F2008_OBS</code> (256) and GFC_STD_F2008_TS (512). Default:
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<code>GFC_STD_F95_OBS | GFC_STD_F95_DEL | GFC_STD_F95 | GFC_STD_F2003
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| GFC_STD_F2008 | GFC_STD_F2008_TS | GFC_STD_F2008_OBS | GFC_STD_F77
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| GFC_STD_GNU | GFC_STD_LEGACY</code>.</td></tr>
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<tr><td width="15%"><var>option</var>[1]</td><td width="70%">Standard-warning flag; prints a warning to
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standard error. Default: <code>GFC_STD_F95_DEL | GFC_STD_LEGACY</code>.</td></tr>
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<tr><td width="15%"><var>option</var>[2]</td><td width="70%">If non zero, enable pedantic checking.
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Default: off.</td></tr>
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<tr><td width="15%"><var>option</var>[3]</td><td width="70%">Unused.</td></tr>
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<tr><td width="15%"><var>option</var>[4]</td><td width="70%">If non zero, enable backtracing on run-time
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errors. Default: off. (Default in the compiler: on.)
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Note: Installs a signal handler and requires command-line
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initialization using <code>_gfortran_set_args</code>.</td></tr>
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<tr><td width="15%"><var>option</var>[5]</td><td width="70%">If non zero, supports signed zeros.
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Default: enabled.</td></tr>
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<tr><td width="15%"><var>option</var>[6]</td><td width="70%">Enables run-time checking. Possible values
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are (bitwise or-ed): GFC_RTCHECK_BOUNDS (1), GFC_RTCHECK_ARRAY_TEMPS (2),
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GFC_RTCHECK_RECURSION (4), GFC_RTCHECK_DO (16), GFC_RTCHECK_POINTER (32).
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Default: disabled.</td></tr>
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<tr><td width="15%"><var>option</var>[7]</td><td width="70%">Unused.</td></tr>
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<tr><td width="15%"><var>option</var>[8]</td><td width="70%">Show a warning when invoking <code>STOP</code> and
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<code>ERROR STOP</code> if a floating-point exception occurred. Possible values
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are (bitwise or-ed) <code>GFC_FPE_INVALID</code> (1), <code>GFC_FPE_DENORMAL</code> (2),
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<code>GFC_FPE_ZERO</code> (4), <code>GFC_FPE_OVERFLOW</code> (8),
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<code>GFC_FPE_UNDERFLOW</code> (16), <code>GFC_FPE_INEXACT</code> (32). Default: None (0).
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(Default in the compiler: <code>GFC_FPE_INVALID | GFC_FPE_DENORMAL |
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GFC_FPE_ZERO | GFC_FPE_OVERFLOW | GFC_FPE_UNDERFLOW</code>.)</td></tr>
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</table>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample"> /* Use gfortran 4.9 default options. */
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static int options[] = {68, 511, 0, 0, 1, 1, 0, 0, 31};
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_gfortran_set_options (9, &options);
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</pre></div>
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</dd>
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</dl>
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Next: <a href="_005fgfortran_005fset_005fconvert.html#g_t_005fgfortran_005fset_005fconvert" accesskey="n" rel="next">_gfortran_set_convert</a>, Previous: <a href="_005fgfortran_005fset_005fargs.html#g_t_005fgfortran_005fset_005fargs" accesskey="p" rel="prev">_gfortran_set_args</a>, Up: <a href="Non_002dFortran-Main-Program.html#Non_002dFortran-Main-Program" accesskey="u" rel="up">Non-Fortran Main Program</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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