176 lines
8.6 KiB
HTML
176 lines
8.6 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1999-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>The GNU Fortran Compiler: Debugging Options</title>
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<meta name="description" content="The GNU Fortran Compiler: Debugging Options">
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<meta name="keywords" content="The GNU Fortran Compiler: Debugging Options">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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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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<link href="Directory-Options.html#Directory-Options" rel="next" title="Directory Options">
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<link href="Error-and-Warning-Options.html#Error-and-Warning-Options" rel="prev" title="Error and Warning Options">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Debugging-Options"></a>
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<div class="header">
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<p>
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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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</div>
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<hr>
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<a name="Options-for-debugging-your-program-or-GNU-Fortran"></a>
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<h3 class="section">2.5 Options for debugging your program or GNU Fortran</h3>
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<a name="index-options_002c-debugging"></a>
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<a name="index-debugging-information-options"></a>
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<p>GNU Fortran has various special options that are used for debugging
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either your program or the GNU Fortran compiler.
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</p>
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<dl compact="compact">
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<dt><code>-fdump-fortran-original</code></dt>
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<dd><a name="index-fdump_002dfortran_002doriginal"></a>
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<p>Output the internal parse tree after translating the source program
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into internal representation. Only really useful for debugging the
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GNU Fortran compiler itself.
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</p>
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</dd>
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<dt><code>-fdump-fortran-optimized</code></dt>
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<dd><a name="index-fdump_002dfortran_002doptimized"></a>
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<p>Output the parse tree after front-end optimization. Only really
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useful for debugging the GNU Fortran compiler itself.
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</p>
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</dd>
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<dt><code>-fdump-parse-tree</code></dt>
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<dd><a name="index-fdump_002dparse_002dtree"></a>
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<p>Output the internal parse tree after translating the source program
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into internal representation. Only really useful for debugging the
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GNU Fortran compiler itself. This option is deprecated; use
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<code>-fdump-fortran-original</code> instead.
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</p>
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</dd>
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<dt><code>-ffpe-trap=<var>list</var></code></dt>
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<dd><a name="index-ffpe_002dtrap_003dlist"></a>
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<p>Specify a list of floating point exception traps to enable. On most
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systems, if a floating point exception occurs and the trap for that
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exception is enabled, a SIGFPE signal will be sent and the program
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being aborted, producing a core file useful for debugging. <var>list</var>
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is a (possibly empty) comma-separated list of the following
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exceptions: ‘<samp>invalid</samp>’ (invalid floating point operation, such as
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<code>SQRT(-1.0)</code>), ‘<samp>zero</samp>’ (division by zero), ‘<samp>overflow</samp>’
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(overflow in a floating point operation), ‘<samp>underflow</samp>’ (underflow
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in a floating point operation), ‘<samp>inexact</samp>’ (loss of precision
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during operation), and ‘<samp>denormal</samp>’ (operation performed on a
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denormal value). The first five exceptions correspond to the five
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IEEE 754 exceptions, whereas the last one (‘<samp>denormal</samp>’) is not
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part of the IEEE 754 standard but is available on some common
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architectures such as x86.
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</p>
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<p>The first three exceptions (‘<samp>invalid</samp>’, ‘<samp>zero</samp>’, and
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‘<samp>overflow</samp>’) often indicate serious errors, and unless the program
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has provisions for dealing with these exceptions, enabling traps for
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these three exceptions is probably a good idea.
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</p>
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<p>Many, if not most, floating point operations incur loss of precision
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due to rounding, and hence the <code>ffpe-trap=inexact</code> is likely to
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be uninteresting in practice.
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</p>
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<p>By default no exception traps are enabled.
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</p>
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</dd>
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<dt><code>-ffpe-summary=<var>list</var></code></dt>
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<dd><a name="index-ffpe_002dsummary_003dlist"></a>
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<p>Specify a list of floating-point exceptions, whose flag status is printed
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to <code>ERROR_UNIT</code> when invoking <code>STOP</code> and <code>ERROR STOP</code>.
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<var>list</var> can be either ‘<samp>none</samp>’, ‘<samp>all</samp>’ or a comma-separated list
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of the following exceptions: ‘<samp>invalid</samp>’, ‘<samp>zero</samp>’, ‘<samp>overflow</samp>’,
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‘<samp>underflow</samp>’, ‘<samp>inexact</samp>’ and ‘<samp>denormal</samp>’. (See
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<samp>-ffpe-trap</samp> for a description of the exceptions.)
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</p>
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<p>By default, a summary for all exceptions but ‘<samp>inexact</samp>’ is shown.
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</p>
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</dd>
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<dt><code>-fno-backtrace</code></dt>
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<dd><a name="index-fno_002dbacktrace"></a>
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<a name="index-backtrace"></a>
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<a name="index-trace"></a>
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<p>When a serious runtime error is encountered or a deadly signal is
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emitted (segmentation fault, illegal instruction, bus error,
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floating-point exception, and the other POSIX signals that have the
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action ‘<samp>core</samp>’), the Fortran runtime library tries to output a
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backtrace of the error. <code>-fno-backtrace</code> disables the backtrace
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generation. This option only has influence for compilation of the
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Fortran main program.
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</p>
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</dd>
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</dl>
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<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
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debugging options.
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</p>
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<hr>
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<div class="header">
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<p>
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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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</div>
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</body>
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</html>
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