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<title>The GNU Fortran Compiler: Standards</title>

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<a name="Standards-1"></a>
<h3 class="section">1.6 Standards</h3>
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<p>The GNU Fortran compiler implements
ISO/IEC 1539:1997 (Fortran 95).  As such, it can also compile essentially all
standard-compliant Fortran 90 and Fortran 77 programs.   It also supports
the ISO/IEC TR-15581 enhancements to allocatable arrays.
</p>
<p>GNU Fortran also have a partial support for ISO/IEC 1539-1:2004 (Fortran
2003), ISO/IEC 1539-1:2010 (Fortran 2008), the Technical Specification
<code>Further Interoperability of Fortran with C</code> (ISO/IEC TS 29113:2012).
Full support of those standards and future Fortran standards is planned.
The current status of the support is can be found in the
<a href="Fortran-2003-status.html#Fortran-2003-status">Fortran 2003 status</a>, <a href="Fortran-2008-status.html#Fortran-2008-status">Fortran 2008 status</a>, <a href="TS-29113-status.html#TS-29113-status">TS 29113 status</a>
and <a href="TS-18508-status.html#TS-18508-status">TS 18508 status</a> sections of the documentation.
</p>
<p>Additionally, the GNU Fortran compilers supports the OpenMP specification
(version 4.0 and most of the features of the 4.5 version,
<a href="http://openmp.org/wp/openmp-specifications/">http://openmp.org/wp/openmp-specifications/</a>).
There also is initial support for the OpenACC specification (targeting
version 2.0, <a href="http://www.openacc.org/">http://www.openacc.org/</a>).
Note that this is an experimental feature, incomplete, and subject to
change in future versions of GCC.  See
<a href="https://gcc.gnu.org/wiki/OpenACC">https://gcc.gnu.org/wiki/OpenACC</a> for more information.
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