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<title>The GNU Fortran Compiler: Extensions implemented in GNU Fortran</title>
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<a name="Extensions-implemented-in-GNU-Fortran"></a>
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<p>
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Next: <a href="Extensions-not-implemented-in-GNU-Fortran.html#Extensions-not-implemented-in-GNU-Fortran" accesskey="n" rel="next">Extensions not implemented in GNU Fortran</a>, Up: <a href="Extensions.html#Extensions" accesskey="u" rel="up">Extensions</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="Extensions-implemented-in-GNU-Fortran-1"></a>
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<h3 class="section">6.1 Extensions implemented in GNU Fortran</h3>
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<a name="index-extensions_002c-implemented"></a>
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<p>GNU Fortran implements a number of extensions over standard
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Fortran. This chapter contains information on their syntax and
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meaning. There are currently two categories of GNU Fortran
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extensions, those that provide functionality beyond that provided
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by any standard, and those that are supported by GNU Fortran
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purely for backward compatibility with legacy compilers. By default,
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<samp>-std=gnu</samp> allows the compiler to accept both types of
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extensions, but to warn about the use of the latter. Specifying
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either <samp>-std=f95</samp>, <samp>-std=f2003</samp> or <samp>-std=f2008</samp>
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disables both types of extensions, and <samp>-std=legacy</samp> allows both
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without warning.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Old_002dstyle-kind-specifications.html#Old_002dstyle-kind-specifications" accesskey="1">Old-style kind specifications</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Old_002dstyle-variable-initialization.html#Old_002dstyle-variable-initialization" accesskey="2">Old-style variable initialization</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Extensions-to-namelist.html#Extensions-to-namelist" accesskey="3">Extensions to namelist</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="X-format-descriptor-without-count-field.html#X-format-descriptor-without-count-field" accesskey="4">X format descriptor without count field</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Commas-in-FORMAT-specifications.html#Commas-in-FORMAT-specifications" accesskey="5">Commas in FORMAT specifications</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Missing-period-in-FORMAT-specifications.html#Missing-period-in-FORMAT-specifications" accesskey="6">Missing period in FORMAT specifications</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="I_002fO-item-lists.html#I_002fO-item-lists" accesskey="7">I/O item lists</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Q-exponent_002dletter.html#Q-exponent_002dletter" accesskey="8"><code>Q</code> exponent-letter</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="BOZ-literal-constants.html#BOZ-literal-constants" accesskey="9">BOZ literal constants</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Real-array-indices.html#Real-array-indices">Real array indices</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Unary-operators.html#Unary-operators">Unary operators</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Implicitly-convert-LOGICAL-and-INTEGER-values.html#Implicitly-convert-LOGICAL-and-INTEGER-values">Implicitly convert LOGICAL and INTEGER values</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Hollerith-constants-support.html#Hollerith-constants-support">Hollerith constants support</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Cray-pointers.html#Cray-pointers">Cray pointers</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="CONVERT-specifier.html#CONVERT-specifier">CONVERT specifier</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OpenMP.html#OpenMP">OpenMP</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="OpenACC.html#OpenACC">OpenACC</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Argument-list-functions.html#Argument-list-functions">Argument list functions</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Read_002fWrite-after-EOF-marker.html#Read_002fWrite-after-EOF-marker">Read/Write after EOF marker</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="STRUCTURE-and-RECORD.html#STRUCTURE-and-RECORD">STRUCTURE and RECORD</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="UNION-and-MAP.html#UNION-and-MAP">UNION and MAP</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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</table>
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<p>
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Next: <a href="Extensions-not-implemented-in-GNU-Fortran.html#Extensions-not-implemented-in-GNU-Fortran" accesskey="n" rel="next">Extensions not implemented in GNU Fortran</a>, Up: <a href="Extensions.html#Extensions" accesskey="u" rel="up">Extensions</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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