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<h2 class="chapter">2 GNU Fortran Command Options</h2>
<p><a name="index-GNU-Fortran-command-options-15"></a><a name="index-command-options-16"></a><a name="index-options_002c-_0040command_007bgfortran_007d-command-17"></a>
<!-- man begin DESCRIPTION -->
<p>The <samp><span class="command">gfortran</span></samp> command supports all the options supported by the
<samp><span class="command">gcc</span></samp> command. Only options specific to GNU Fortran are documented here.
<p>See <a href="../gcc/Invoking-GCC.html#Invoking-GCC">GCC Command Options</a>, for information
on the non-Fortran-specific aspects of the <samp><span class="command">gcc</span></samp> command (and,
therefore, the <samp><span class="command">gfortran</span></samp> command).
<p><a name="index-options_002c-negative-forms-18"></a>All GCC and GNU Fortran options
are accepted both by <samp><span class="command">gfortran</span></samp> and by <samp><span class="command">gcc</span></samp>
(as well as any other drivers built at the same time,
such as <samp><span class="command">g++</span></samp>),
since adding GNU Fortran to the GCC distribution
enables acceptance of GNU Fortran options
by all of the relevant drivers.
<p>In some cases, options have positive and negative forms;
the negative form of <samp><span class="option">-ffoo</span></samp> would be <samp><span class="option">-fno-foo</span></samp>.
This manual documents only one of these two forms, whichever
one is not the default.
<!-- man end -->
<ul class="menu">
<li><a accesskey="1" href="Option-Summary.html#Option-Summary">Option Summary</a>: Brief list of all <samp><span class="command">gfortran</span></samp> options,
without explanations.
<li><a accesskey="2" href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Fortran Dialect Options</a>: Controlling the variant of Fortran language
compiled.
<li><a accesskey="3" href="Preprocessing-Options.html#Preprocessing-Options">Preprocessing Options</a>: Enable and customize preprocessing.
<li><a accesskey="4" href="Error-and-Warning-Options.html#Error-and-Warning-Options">Error and Warning Options</a>: How picky should the compiler be?
<li><a accesskey="5" href="Debugging-Options.html#Debugging-Options">Debugging Options</a>: Symbol tables, measurements, and debugging dumps.
<li><a accesskey="6" href="Directory-Options.html#Directory-Options">Directory Options</a>: Where to find module files
<li><a accesskey="7" href="Link-Options.html#Link-Options">Link Options </a>: Influencing the linking step
<li><a accesskey="8" href="Runtime-Options.html#Runtime-Options">Runtime Options</a>: Influencing runtime behavior
<li><a accesskey="9" href="Code-Gen-Options.html#Code-Gen-Options">Code Gen Options</a>: Specifying conventions for function calls, data layout
and register usage.
<li><a href="Environment-Variables.html#Environment-Variables">Environment Variables</a>: Environment variables that affect <samp><span class="command">gfortran</span></samp>.
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