Fortran is one of the earliest imperative computer programming languages around. It is often used for scientificand numeric programs. This page lists free Fortran compilers for various operating systems. Note that the differentsoftware listed are compliant with different Fortran standards, eg, ANSI Fortran 77, Fortran 95, Fortran 2003,Fortran 2008, Fortran 2018, and so on, so be sure to get the appropriate one for your purpose. Some of them may alsocome complete with debuggers,editors and anintegrated development environment (IDE).
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Free Fortran Compilers and IDEs
Pro Fortran for macOS System Requirements. Intel CPU based system – multi-core suggested for best performance. MacOS Sierra (10.12) through macOS Big Sur (11.0) OS X Snow Leopard (10.6) through OS X El Capitan (10.11) 2 GB RAM – 4 GB recommended for best performance. 1 GB free disk space for complete installation. FREE - FTN95 is free for personal and evaluation use. That includes the Visual Studio plug-ins and its unbeatable bug finding technology! That includes the Visual Studio plug-ins and its unbeatable bug finding technology! The Intel® Fortran Compiler (Beta) (. ) is a new compiler based on the Intel® Fortran Compiler Classic (. ) frontend and runtime libraries, using LLVM backend technology. At this time, ifx. Supports features of the Fortran 95 language, most OpenMP 4.5.
Flang is the Fortran compiler front end of the LLVM project (which also includes other compilers, suchas a C/C++ compiler).The current version (as at the date this was written) implements Fortran 2003 (with some features fromFortran 2008), while the next version (currently foundhere) implements Fortran 2018.The link above leads to the source code for the compiler. Thedownloadable binaries (ie, executables)can be found here. Note that the binaries are for Linux (both x86-64 and OpenPOWER) only, although work ona Windows port has begun.
The AMD Optimizing C/C++ Compiler Suite (or 'AOCC') includes an optimizing Fortran compiler that can generate code for32-bit and 64-bit Linux systems. It also comes with optimized libraries.
This system comes with the GNU G77 Fortran compiler (among other things, including aC/C++ compiler), which you can use to generate Win32 executables fromF77 code. Like many systems based on the GNU tools, Mingw32 comes with complete with various programming tools,such as a program maintainence program (ie, make), text processing tools (sed, grep),lexical analyser generator (flex), parser generator (bison), etc.
gfortran, part of the GNU Compiler Collection, is a free Fortran 95/2003/2008 compiler. Like all things from GNU, it comeswith source code. Precompiled binaries (executables) are available for Windows, Linux, Mac OS X, the old Mac OS (PPC), etc.
Silverfrost FTN95 is a Fortran 95 compiler that supports Fortran 77, Fortran 90 and Fortran 95. The compiler generates32-bit and 64-bit exectuables for Windows and the Microsoft .NET framework. It comes with CHECKMATE,a tool that lets programmers check the correctness of their code at runtime. Also included is Plato 3 (an IDE),full source level debugging, documentation and examples. You may only generate code for your personal use on yourhome computer, and all executables will display a banner on execution.
The Watcom (now OpenWatcom) Fortran 77 compiler is now available free of charge, complete with source code.This compiler, which generates code for Win32, Windows 3.1 (Win16), OS/2, Netware, MSDOS(16 and 32 bit), etc, was a well-known compiler some years back (until Sybase terminated it).
[Update (17 November 2020): their website does not seem to be working correctly, withonly a partial change log on the main page, and no links to the compiler or anything else. I'm not sure ifthis is just a temporary situation (eg, due to an error in their web server configuration, such as failing toinstall PHP, since there are fragments of PHP code on the page), or if the site has really gone.]
G95 is an open source Fortran 95 compiler. At the time this was written, most of the ISO Fortran 95 standardhas been implemented. Platforms supported include Linux(x86, Intel IA64, AMD x86_64), Windows, Macintosh OS X, FreeBSD,Sparc Solaris and HP-UX.
The Oracle Developer Studio includes C, C++ and Fortran compilers for Linux (specifically the Red Hat and Oracledistributions) andSolaris. Based on information displayed on the download page at the date this entry was written, it looks like you canfreely use the compiler for developing commercial applications if you wish. (As with all software, you should of courseverify this yourself, since the situation sometimes changes over time.)
f2j translates Fortran 77 source code to Java class files. It is distributed under theGNU GPL and runs on Linux, SunOS/Solaris.
This is a well-known Fortran to C converter that comes with source code. The site alsoincludes pre-compiled binaries (executables) for MSDOS and Microsoft Windows, althoughthese are by no means the only systems supported - the compiler works on Unix systems likeBSD, Linux, etc. You have to compile the compiler yourself on those systems.Libraries containing the runtime support needed (together with the C source code)are also included. You need a C compiler to generatebinaries from your Fortran sources.
This is a development system based on the well-known GNU compiler system that includes compilers for Fortran 77,C, C++, Objective C, etc.It generates 32 bit MSDOS executables that is Windows 95 long-filename-aware. It is a very complete system with IDEs,graphics libraries,lexical analyser generators (flex), parser generators (bison),text processing utilities (like grep, sed),a program maintainence utility (ie, make),a DOS extender, and so on. The compiler,utilities and libraries come with source code.
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Contents
Code::Blocks is a free, cross platform Integrated Development Environment (IDE) (www.codeblocks.org). This site is for those, who would like to use Code::Blocks IDE for Fortran. Here you can find a customized (more or less) version of IDE oriented towards Fortran language (pre-built binaries for Linux and Windows are available). Also you can find some useful information about how to use it for programming with Fortran.
Note: FortranProject plugin, which makes C::B useful for Fortran, currently is included in an official Code::Blocks distribution for Windows (but not for Linux).
News
(26.07.2021)
A new release v1.8 is out. Improvements in this release:
Considerably improved support for the C Pre-Processor (PP) directives. During the parsing, every Fortran source code line now goes through the PP and only then the code is interpreted as a Fortran code. This improvement enables the code-completion in a code which uses such PP directives. As an example, I created a short tutorial how to use Fortran Template Library in CBFortran .
Code lines, which are excluded from the compilation by the use of the PP directives (such as '#ifdef') are marked (shadowed) in the C::B editor. This should improve readability of such code. See a screenshot below.
Added an option to the FortranProject plugin settings, which makes a word from the code-completion list always replace the word under the caret in the editor. Default behaviour is that the word under the caret is replaced only in a few circumstances.
(12.07.2020)
I took part inInternational Fortran Conference 2020 on 2-4 July 2020. There I spoked how Code::Blocks can be used for programming in Fortran. Presentation slides are below:
CodeBlocks_Fortran.odp (recommended, with gif animations)
CodeBlocks_Fortran.pdf (gif animations are not displayed)
(07.06.2020)
A new release v1.7 is out.
In this release Code::Blocks IDE was switched to use v3 of wxWidgets library. Perhaps, the biggest improvement is for users with HiDPI displays: now the used size of icons changes depending on the monitor's DPI.
Visual Fortran Free Download
There is more improvements for Fortran: Call-/Called-By tree now can show dependency between modules; dependency between Fortran files is accounted at a workspace level instead of a project level as it was before; some improvements in a logic used by smart-code-completion.
(12.01.2019)
Install Fortran Compiler Mac
A new release v1.6 is out. Improvements in this release:
Improvements in Debugger plugin:
Improved how arrays are displayed in the Watches window.
Improved how character, complex and dynamic-type variables are displayed in the Watches window. This feature requires GDB with Python support.
Implemented possibility to visualize content of 1D or 2D array as a curve or 2D surface directly from the debugger session. For this purpose Gnuplot external program is used. This feature requires the GDB with Python support and Gnuplot installed on the system. See the screen-shot below.
More information about debugging in C::B can be found in Debugging Fortran code in the Code::Blocks IDE.
Improvements in 'Call/Called by' tree view: now using the right-click menu is possible to go to the calling line.
Improved the logic behind the brace completion: more intelligent, more intuitive.
Implemented possibility to add an additional search path for the code-completion items in the project properties dialog. See screen-shot below.
Parser now interprets simple preprocessor directives. This should improve the work with code which contains such directives.
Added Flang compiler support. Compiler can be downloaded from github.com/flang-compiler.
(30.12.2018)
Fortran Download Free
I have uploaded a new video tutorial on YouTube which demonstrates how to debug Fortran code using C::B:
Features
Editor with Fortran syntax highlighting (fixed and free form).
Compilation of Fortran project directly from IDE. FortranProject plugin should care about Fortran file dependencies. Alternatively you can use your supplied makefile.
Possibility to jump directly to the code line with an error (currently the support of gfortran, flang, Intel Fortran, Oracle Solaris Studio Fortran and PGI Fortran is implemented).
Symbols browser with defined program units (functions, subroutines, modules etc.) in your project.
Possibility to jump to code line with subroutine/function definition directly from editor (right click on the name and select 'Jump to: 'name') or from the symbols browser (double click on the name) or using menu 'Search->Jump to declaration'.
Program debugging using GNU GDB.
Completion of names when you type or when you press Ctrl+Space (you can change the key combinations in Editor's Settings). The support for subroutine/function names, the names of variables, the components of derived types and the type-bound procedures is implemented.
Call-tips with subroutine/function argument list. Appears automatically or when you press Ctrl+Shift+Space.
Appearance of tooltips when you hold mouse on variable or name of subroutine.
Jump to the definition of procedure or the variable from code line where it is mentioned.
Possibility to generate a Makefile (Fortran->Genarate Makefile). This feature should generate a working makefile for the active target in simple cases. Or the generated makefile can be used as a draft in more sophisticated projects.
and more
License
Code::Blocks (and FortranProject plugin) is distributed at GPLv3.
User manual
You can download the Code::Blocks user manual from www.codeblocks.org/user-manual.
Development
The major part, which makes C::B IDE useful for Fortran, is FortranProject plugin. This plugin has a separate project for development onSourceforge.There you can download latest source code directly from svn.
Contribution
How to contribute to this project:
Spread a word about your experience with Code::Blocks.
Write tutorial about how to use C::B together with Fortran. Send it to CBFortran forum.
Prepare screencast (video tutorial) and upload it to e.g. Youtube. Drop link to CBFortran forum.
Suggest features you would like to be implemented into this IDE.
Report bugs to CBFortran forum or write directly to me.
Write a new plugin for Code::Blocks useful for Fortran developers.
Implement a new feature to FortranProject plugin or improve existing one. Send me a patch file.
About me
My name is Darius Markauskas. I develop for this project on my spare time.
Some info about my main job can be found here.
Have questions, suggestions? Found a bug?Write me to: darmar.lt@gmail.com