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There are other extensions recognized, such as. If the file is named code.F90 gfortran supposes it is free-form source and preprocess it. If the file is named code.F gfortran supposes it is fixed-form source and performs preprocessing. If the file is named code.f90 gfortran supposes it is free-form source, with no preprocessing needed. If the file is named code.f gfortran supposes it is fixed-form source, with no preprocessing needed. Complete example is:įree-form, fixed-form and file extensionsīy default, gfortran is aware of a few file extensions, and its action depends on the extension of the file you ask it to compile. One way to avoid this (more ideas can be found on the binaries page) is to use the so-called "static linking", available with option -static gfortran then put the library code inside the program created, thus enabling it to run without the library present (like, on a computer where gfortran is not installed). That explains why, if gfortran is installed in a non-standard directory, it may compile your code fine but the executable may fail with an error message like library not found. Gfortran is composed of two main parts: the compiler, which creates the executable program from your code, and the library, which is used when you run your program afterwards. _This section does not apply to Windows users, except for Cygwin users with gcc4-4.3.2-2 or later._ Getting one file compiled: static linking Of course, you might consider giving it a more appropriate name: you can specify the name you want with the -o option: This executable will be called a.out on unix systems and a.exe on Windows. Gfortran will then create an executable from your code. If your program is only in one file (a hello-world program, or any simple code that doesn't require external libraries), the compilation is straightforward:

Content is in increasing order of accointance with the compiler. This page is here to explain the basic use of the compiler and to teach you its most commonly used options. You have downloaded and installed gfortran (or it was already installed with your system), and now you would like to use it.