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<title>The GNU Fortran Compiler: Option Summary</title>

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<a name="Option-Summary"></a>
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<p>
Next: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options" accesskey="n" rel="next">Fortran Dialect Options</a>, Up: <a href="Invoking-GNU-Fortran.html#Invoking-GNU-Fortran" accesskey="u" rel="up">Invoking GNU Fortran</a> &nbsp; [<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="Option-summary"></a>
<h3 class="section">2.1 Option summary</h3>


<p>Here is a summary of all the options specific to GNU Fortran, grouped
by type.  Explanations are in the following sections.
</p>
<dl compact="compact">
<dt><em>Fortran Language Options</em></dt>
<dd><p>See <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options">Options controlling Fortran dialect</a>.
</p><div class="smallexample">
<pre class="smallexample">-fall-intrinsics -fbackslash -fcray-pointer -fd-lines-as-code 
-fd-lines-as-comments 
-fdec -fdec-structure -fdec-intrinsic-ints -fdec-static -fdec-math 
-fdefault-double-8 -fdefault-integer-8 
-fdefault-real-8 -fdollar-ok -ffixed-line-length-<var>n</var> 
-ffixed-line-length-none -ffree-form -ffree-line-length-<var>n</var> 
-ffree-line-length-none -fimplicit-none -finteger-4-integer-8 
-fmax-identifier-length -fmodule-private -ffixed-form -fno-range-check 
-fopenacc -fopenmp -freal-4-real-10 -freal-4-real-16 -freal-4-real-8 
-freal-8-real-10 -freal-8-real-16 -freal-8-real-4 -std=<var>std</var>
-ftest-forall-temp

</pre></div>

</dd>
<dt><em>Preprocessing Options</em></dt>
<dd><p>See <a href="Preprocessing-Options.html#Preprocessing-Options">Enable and customize preprocessing</a>.
</p><div class="smallexample">
<pre class="smallexample">-A-<var>question</var><span class="roman">[</span>=<var>answer</var><span class="roman">]</span>
-A<var>question</var>=<var>answer</var> -C -CC -D<var>macro</var><span class="roman">[</span>=<var>defn</var><span class="roman">]</span>
-H -P 
-U<var>macro</var> -cpp -dD -dI -dM -dN -dU -fworking-directory
-imultilib <var>dir</var> 
-iprefix <var>file</var> -iquote -isysroot <var>dir</var> -isystem <var>dir</var> -nocpp 
-nostdinc 
-undef

</pre></div>

</dd>
<dt><em>Error and Warning Options</em></dt>
<dd><p>See <a href="Error-and-Warning-Options.html#Error-and-Warning-Options">Options to request or suppress errors
and warnings</a>.
</p><div class="smallexample">
<pre class="smallexample">-Waliasing -Wall -Wampersand -Wargument-mismatch -Warray-bounds
-Wc-binding-type -Wcharacter-truncation 
-Wconversion -Wfunction-elimination -Wimplicit-interface 
-Wimplicit-procedure -Wintrinsic-shadow -Wuse-without-only -Wintrinsics-std 
-Wline-truncation -Wno-align-commons -Wno-tabs -Wreal-q-constant 
-Wsurprising -Wunderflow -Wunused-parameter -Wrealloc-lhs -Wrealloc-lhs-all 
-Wtarget-lifetime -fmax-errors=<var>n</var> -fsyntax-only -pedantic -pedantic-errors

</pre></div>

</dd>
<dt><em>Debugging Options</em></dt>
<dd><p>See <a href="Debugging-Options.html#Debugging-Options">Options for debugging your program or GNU Fortran</a>.
</p><div class="smallexample">
<pre class="smallexample">-fbacktrace -fdump-fortran-optimized -fdump-fortran-original 
-fdump-parse-tree -ffpe-trap=<var>list</var> -ffpe-summary=<var>list</var>

</pre></div>

</dd>
<dt><em>Directory Options</em></dt>
<dd><p>See <a href="Directory-Options.html#Directory-Options">Options for directory search</a>.
</p><div class="smallexample">
<pre class="smallexample">-I<var>dir</var>  -J<var>dir</var> -fintrinsic-modules-path <var>dir</var>
</pre></div>

</dd>
<dt><em>Link Options</em></dt>
<dd><p>See <a href="Link-Options.html#Link-Options">Options for influencing the linking step</a>.
</p><div class="smallexample">
<pre class="smallexample">-static-libgfortran
</pre></div>

</dd>
<dt><em>Runtime Options</em></dt>
<dd><p>See <a href="Runtime-Options.html#Runtime-Options">Options for influencing runtime behavior</a>.
</p><div class="smallexample">
<pre class="smallexample">-fconvert=<var>conversion</var> -fmax-subrecord-length=<var>length</var> 
-frecord-marker=<var>length</var> -fsign-zero

</pre></div>

</dd>
<dt><em>Code Generation Options</em></dt>
<dd><p>See <a href="Code-Gen-Options.html#Code-Gen-Options">Options for code generation conventions</a>.
</p><div class="smallexample">
<pre class="smallexample">-faggressive-function-elimination -fblas-matmul-limit=<var>n</var> 
-fbounds-check -ftail-call-workaround -ftail-call-workaround=<var>n</var> 
-fcheck-array-temporaries 
-fcheck=<var>&lt;all|array-temps|bounds|do|mem|pointer|recursion&gt;</var> 
-fcoarray=<var>&lt;none|single|lib&gt;</var> -fexternal-blas -ff2c
-ffrontend-optimize 
-finit-character=<var>n</var> -finit-integer=<var>n</var> -finit-local-zero 
-finit-derived 
-finit-logical=<var>&lt;true|false&gt;</var>
-finit-real=<var>&lt;zero|inf|-inf|nan|snan&gt;</var> 
-finline-matmul-limit=<var>n</var> 
-fmax-array-constructor=<var>n</var> -fmax-stack-var-size=<var>n</var>
-fno-align-commons 
-fno-automatic -fno-protect-parens -fno-underscoring 
-fsecond-underscore -fpack-derived -frealloc-lhs -frecursive 
-frepack-arrays -fshort-enums -fstack-arrays

</pre></div>
</dd>
</dl>

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Next: <a href="Fortran-Dialect-Options.html#Fortran-Dialect-Options" accesskey="n" rel="next">Fortran Dialect Options</a>, Up: <a href="Invoking-GNU-Fortran.html#Invoking-GNU-Fortran" accesskey="u" rel="up">Invoking GNU Fortran</a> &nbsp; [<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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