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<title>The GNU Fortran Compiler: Project Status</title>
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<p>
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Next: <a href="Standards.html#Standards" accesskey="n" rel="next">Standards</a>, Previous: <a href="GNU-Fortran-and-G77.html#GNU-Fortran-and-G77" accesskey="p" rel="prev">GNU Fortran and G77</a>, Up: <a href="Introduction.html#Introduction" accesskey="u" rel="up">Introduction</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="Project-Status-1"></a>
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<h3 class="section">1.5 Project Status</h3>
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<blockquote>
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<p>As soon as <code>gfortran</code> can parse all of the statements correctly,
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it will be in the “larva” state.
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When we generate code, the “puppa” state.
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When <code>gfortran</code> is done,
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we’ll see if it will be a beautiful butterfly,
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or just a big bug....
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</p>
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<p>–Andy Vaught, April 2000
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</p></blockquote>
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<p>The start of the GNU Fortran 95 project was announced on
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the GCC homepage in March 18, 2000
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(even though Andy had already been working on it for a while,
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of course).
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</p>
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<p>The GNU Fortran compiler is able to compile nearly all
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standard-compliant Fortran 95, Fortran 90, and Fortran 77 programs,
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including a number of standard and non-standard extensions, and can be
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used on real-world programs. In particular, the supported extensions
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include OpenMP, Cray-style pointers, some old vendor extensions, and several
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Fortran 2003 and Fortran 2008 features, including TR 15581. However, it is
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still under development and has a few remaining rough edges.
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There also is initial support for OpenACC.
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Note that this is an experimental feature, incomplete, and subject to
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change in future versions of GCC. See
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<a href="https://gcc.gnu.org/wiki/OpenACC">https://gcc.gnu.org/wiki/OpenACC</a> for more information.
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</p>
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<p>At present, the GNU Fortran compiler passes the
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<a href="http://www.fortran-2000.com/ArnaudRecipes/fcvs21_f95.html">NIST Fortran 77 Test Suite</a>, and produces acceptable results on the
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<a href="http://www.netlib.org/lapack/faq.html#1.21">LAPACK Test Suite</a>.
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It also provides respectable performance on
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the <a href="http://www.polyhedron.com/fortran-compiler-comparisons/polyhedron-benchmark-suite">Polyhedron Fortran
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compiler benchmarks</a> and the
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<a href="http://www.netlib.org/benchmark/livermore">Livermore Fortran Kernels test</a>. It has been used to compile a number of
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large real-world programs, including
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<a href="http://hirlam.org/">the HARMONIE and HIRLAM weather forecasting code</a> and
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<a href="http://physical-chemistry.scb.uwa.edu.au/tonto/wiki/index.php/Main_Page">the Tonto quantum chemistry package</a>; see
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<a href="https://gcc.gnu.org/wiki/GfortranApps">https://gcc.gnu.org/wiki/GfortranApps</a> for an extended list.
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</p>
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<p>Among other things, the GNU Fortran compiler is intended as a replacement
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for G77. At this point, nearly all programs that could be compiled with
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G77 can be compiled with GNU Fortran, although there are a few minor known
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regressions.
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</p>
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<p>The primary work remaining to be done on GNU Fortran falls into three
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categories: bug fixing (primarily regarding the treatment of invalid code
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and providing useful error messages), improving the compiler optimizations
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and the performance of compiled code, and extending the compiler to support
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future standards—in particular, Fortran 2003 and Fortran 2008.
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