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GNU Fortran
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<h2 id="history">History</h2> <p>As of July 2020, GFortran had almost fully implemented <a href="/facts/Fortran_2008/m1KqjcMU">Fortran 2008</a>, and about 20% of <a href="/facts/Fortran_2018/m1KqjcMU">Fortran 2018</a>.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a><a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> It supports the <a href="/facts/OpenMP/69IpI80o">OpenMP</a><a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> <a href="/facts/Cross-platform_software/16zqdvNR">multi-platform</a> <a href="/facts/Shared_memory/zmpH7WuV">shared memory</a> <a href="/facts/Multiprocessing/aDCfehDQ">multiprocessing</a>, up to its latest version (4.5).<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> GFortran is also compatible with most language extensions and compilation options supported by g77,<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> and many other popular extensions of the Fortran language.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> </p><p>Since GCC version 4.0.0, released in April 2005,<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a> GFortran has replaced the older g77 compiler. The new Fortran <a href="/facts/Front-end_(computing)/QVUfH8gu">front-end</a> for GCC was rewritten from scratch,<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a> after the principal author and maintainer of g77, Craig Burley, decided in 2001 to stop working on the g77 front end.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> GFortran <a href="/facts/Fork_(software_development)/D6khxhpr">forked</a> off from <a href="/facts/G95/mPvrr2gq">g95</a> in January 2003, which itself started in early 2000. The two <a href="/facts/Codebase/MT0CJ4oD">codebases</a> have "significantly diverged" according to GCC developers,<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> and g95 has not been maintained since 2013. Since 2010 the front-end, like the rest of the GCC project, has been migrated to <a href="/facts/C%252B%252B/Et0F2qn9">C++</a>, where it was previously written in <a href="/facts/C_(programming_language)/Ky2No763">C</a>.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> Development of the compiler by volunteer users continues<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> and each new version of GCC incorporates better support for the latest language standards and bug fixes. </p> <h2 id="see-also">See also</h2> <ul> <li>Free and open-source software portal</li></ul> <ul><li><a href="/facts/Cray_pointer/Krve5QWn">Cray pointer</a></li> <li><a href="/facts/Quadruple-precision_floating-point_format/50oPmapW">Quadruple-precision floating-point format</a></li> <li><a href="/facts/Simply_Fortran/eo23l6yK">Simply Fortran</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="https://gcc.gnu.org/fortran/">Official website</a> </li> <li><a href="https://gcc.gnu.org/wiki/GFortran">GFortran on the GCC Wiki</a></li> <li>The <a href="https://fortranwiki.org/fortran/show/GFortran">GFortran</a> page of the Fortran Wiki.</li> <li><a href="https://sites.google.com/site/gfortransite/">OpenMP in gfortran information web page</a> <a href="https://web.archive.org/web/20101211125359/http://sites.google.com/site/gfortransite/">Archived</a> 2010-12-11 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Chart of Fortran 2003 Features supported by GNU Fortran". GNU. Retrieved 2009-06-25. <a href="https://gcc.gnu.org/wiki/Fortran2003Status" target="_blank">https://gcc.gnu.org/wiki/Fortran2003Status</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Chart of Fortran 2008 Features supported by GNU Fortran". GNU. Retrieved 2009-06-25. <a href="https://gcc.gnu.org/wiki/Fortran2008Status" target="_blank">https://gcc.gnu.org/wiki/Fortran2008Status</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Parallel Computing in Fortran with OpenMP". <a href="https://jblevins.org/log/openmp" target="_blank">https://jblevins.org/log/openmp</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"OpenMP (The GNU Fortran Compiler)". <a href="https://gcc.gnu.org/onlinedocs/gfortran/OpenMP.html#OpenMP" target="_blank">https://gcc.gnu.org/onlinedocs/gfortran/OpenMP.html#OpenMP</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"Discussion of incompatibilities between g77 and gfortran". GNU. Retrieved 2007-01-26. <a href="https://gcc.gnu.org/ml/fortran/2007-01/msg00619.html" target="_blank">https://gcc.gnu.org/ml/fortran/2007-01/msg00619.html</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"Extensions implemented in GNU Fortran (The GNU Fortran Compiler)". <a href="https://gcc.gnu.org/onlinedocs/gfortran/Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran" target="_blank">https://gcc.gnu.org/onlinedocs/gfortran/Extensions-implemented-in-GNU-Fortran.html#Extensions-implemented-in-GNU-Fortran</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"GCC 4.0 Release Series - GNU Project". <a href="https://gcc.gnu.org/gcc-4.0/" target="_blank">https://gcc.gnu.org/gcc-4.0/</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"GFORTRAN and G77 - the GNU Fortran 95 Compiler". <a href="https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gfortran/GFORTRAN-and-G77.html" target="_blank">https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gfortran/GFORTRAN-and-G77.html</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>"Why I'm Stopping My G77 Work". <a href="http://www.kilmnj.com/g77/why.html" target="_blank">http://www.kilmnj.com/g77/why.html</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>"The other GCC-based Fortran compiler". GNU. Retrieved 2007-04-11. <a href="https://gcc.gnu.org/wiki/TheOtherGCCBasedFortranCompiler" target="_blank">https://gcc.gnu.org/wiki/TheOtherGCCBasedFortranCompiler</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>"GCC allows C++ – to some degree - the H Open: News and Features". <a href="http://www.h-online.com/open/news/item/GCC-allows-C-to-some-degree-1012611.html" target="_blank">http://www.h-online.com/open/news/item/GCC-allows-C-to-some-degree-1012611.html</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>"Letter from GCC/gfortran contributor with a brief history". Fortran Discourse. 2023-02-12. Retrieved 2023-02-24. <a href="https://fortran-lang.discourse.group/t/letter-from-gcc-gfortran-contributor-with-a-brief-history/5188/2" target="_blank">https://fortran-lang.discourse.group/t/letter-from-gcc-gfortran-contributor-with-a-brief-history/5188/2</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> </ol>