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| <title>The GNU Fortran Compiler: Debugging Options</title> |
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| Next: <a href="Directory-Options.html#Directory-Options" accesskey="n" rel="next">Directory Options</a>, Previous: <a href="Error-and-Warning-Options.html#Error-and-Warning-Options" accesskey="p" rel="prev">Error and Warning 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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| <hr> |
| <a name="Options-for-debugging-your-program-or-GNU-Fortran"></a> |
| <h3 class="section">2.5 Options for debugging your program or GNU Fortran</h3> |
| <a name="index-options_002c-debugging"></a> |
| <a name="index-debugging-information-options"></a> |
| |
| <p>GNU Fortran has various special options that are used for debugging |
| either your program or the GNU Fortran compiler. |
| </p> |
| <dl compact="compact"> |
| <dt><code>-fdump-fortran-original</code></dt> |
| <dd><a name="index-fdump_002dfortran_002doriginal"></a> |
| <p>Output the internal parse tree after translating the source program |
| into internal representation. Only really useful for debugging the |
| GNU Fortran compiler itself. |
| </p> |
| </dd> |
| <dt><code>-fdump-fortran-optimized</code></dt> |
| <dd><a name="index-fdump_002dfortran_002doptimized"></a> |
| <p>Output the parse tree after front-end optimization. Only really |
| useful for debugging the GNU Fortran compiler itself. |
| </p> |
| </dd> |
| <dt><code>-fdump-parse-tree</code></dt> |
| <dd><a name="index-fdump_002dparse_002dtree"></a> |
| <p>Output the internal parse tree after translating the source program |
| into internal representation. Only really useful for debugging the |
| GNU Fortran compiler itself. This option is deprecated; use |
| <code>-fdump-fortran-original</code> instead. |
| </p> |
| </dd> |
| <dt><code>-ffpe-trap=<var>list</var></code></dt> |
| <dd><a name="index-ffpe_002dtrap_003dlist"></a> |
| <p>Specify a list of floating point exception traps to enable. On most |
| systems, if a floating point exception occurs and the trap for that |
| exception is enabled, a SIGFPE signal will be sent and the program |
| being aborted, producing a core file useful for debugging. <var>list</var> |
| is a (possibly empty) comma-separated list of the following |
| exceptions: ‘<samp>invalid</samp>’ (invalid floating point operation, such as |
| <code>SQRT(-1.0)</code>), ‘<samp>zero</samp>’ (division by zero), ‘<samp>overflow</samp>’ |
| (overflow in a floating point operation), ‘<samp>underflow</samp>’ (underflow |
| in a floating point operation), ‘<samp>inexact</samp>’ (loss of precision |
| during operation), and ‘<samp>denormal</samp>’ (operation performed on a |
| denormal value). The first five exceptions correspond to the five |
| IEEE 754 exceptions, whereas the last one (‘<samp>denormal</samp>’) is not |
| part of the IEEE 754 standard but is available on some common |
| architectures such as x86. |
| </p> |
| <p>The first three exceptions (‘<samp>invalid</samp>’, ‘<samp>zero</samp>’, and |
| ‘<samp>overflow</samp>’) often indicate serious errors, and unless the program |
| has provisions for dealing with these exceptions, enabling traps for |
| these three exceptions is probably a good idea. |
| </p> |
| <p>Many, if not most, floating point operations incur loss of precision |
| due to rounding, and hence the <code>ffpe-trap=inexact</code> is likely to |
| be uninteresting in practice. |
| </p> |
| <p>By default no exception traps are enabled. |
| </p> |
| </dd> |
| <dt><code>-ffpe-summary=<var>list</var></code></dt> |
| <dd><a name="index-ffpe_002dsummary_003dlist"></a> |
| <p>Specify a list of floating-point exceptions, whose flag status is printed |
| to <code>ERROR_UNIT</code> when invoking <code>STOP</code> and <code>ERROR STOP</code>. |
| <var>list</var> can be either ‘<samp>none</samp>’, ‘<samp>all</samp>’ or a comma-separated list |
| of the following exceptions: ‘<samp>invalid</samp>’, ‘<samp>zero</samp>’, ‘<samp>overflow</samp>’, |
| ‘<samp>underflow</samp>’, ‘<samp>inexact</samp>’ and ‘<samp>denormal</samp>’. (See |
| <samp>-ffpe-trap</samp> for a description of the exceptions.) |
| </p> |
| <p>By default, a summary for all exceptions but ‘<samp>inexact</samp>’ is shown. |
| </p> |
| </dd> |
| <dt><code>-fno-backtrace</code></dt> |
| <dd><a name="index-fno_002dbacktrace"></a> |
| <a name="index-backtrace"></a> |
| <a name="index-trace"></a> |
| <p>When a serious runtime error is encountered or a deadly signal is |
| emitted (segmentation fault, illegal instruction, bus error, |
| floating-point exception, and the other POSIX signals that have the |
| action ‘<samp>core</samp>’), the Fortran runtime library tries to output a |
| backtrace of the error. <code>-fno-backtrace</code> disables the backtrace |
| generation. This option only has influence for compilation of the |
| Fortran main program. |
| </p> |
| </dd> |
| </dl> |
| |
| <p>See <a href="http://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html#Debugging-Options">Options for Debugging Your Program or GCC</a> in <cite>Using the GNU Compiler Collection (GCC)</cite>, for more information on |
| debugging options. |
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| Next: <a href="Directory-Options.html#Directory-Options" accesskey="n" rel="next">Directory Options</a>, Previous: <a href="Error-and-Warning-Options.html#Error-and-Warning-Options" accesskey="p" rel="prev">Error and Warning 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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