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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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- <h3 class="section">6.1 Extensions implemented in GNU Fortran</h3>
- <a name="index-extensions_002c-implemented"></a>
- <p>GNU Fortran implements a number of extensions over standard
- Fortran. This chapter contains information on their syntax and
- meaning. There are currently two categories of GNU Fortran
- extensions, those that provide functionality beyond that provided
- by any standard, and those that are supported by GNU Fortran
- purely for backward compatibility with legacy compilers. By default,
- <samp>-std=gnu</samp> allows the compiler to accept both types of
- extensions, but to warn about the use of the latter. Specifying
- either <samp>-std=f95</samp>, <samp>-std=f2003</samp> or <samp>-std=f2008</samp>
- disables both types of extensions, and <samp>-std=legacy</samp> allows both
- without warning. The special compile flag <samp>-fdec</samp> enables additional
- compatibility extensions along with those enabled by <samp>-std=legacy</samp>.
- </p>
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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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- <tr><td align="left" valign="top">• <a href="Type-variants-for-integer-intrinsics.html#Type-variants-for-integer-intrinsics">Type variants for integer intrinsics</a>:</td><td> </td><td align="left" valign="top">
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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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