gfortran

GFortran is the GNU Fortran compiler, part of the GNU Compiler Collection (GCC). It is free software released under the GNU General Public License and runs on multiple platforms, including Linux, Windows, and macOS. GFortran translates Fortran source code into native machine code and is widely used in scientific, engineering, and numerical computing for its portability, compatibility with GCC tooling, and performance.

GFortran implements a substantial portion of the Fortran language standards. It has strong support for Fortran 95 and features from later revisions, with ongoing development to cover additional capabilities from Fortran 2003 and Fortran 2008, and some elements from newer standards. The compiler supports common Fortran primitives such as modules, derived types, allocatable and automatic arrays, array operations, interface blocks, and various procedure attributes. It provides interoperability with C through the ISO_C_BINDING module, enabling calls between Fortran and C and other languages. OpenMP support is available via the -fopenmp option for shared-memory parallelism, and users can leverage GCC’s optimization infrastructure for performance, including link-time optimization when available. Debugging and development tooling integrate with standard utilities such as gdb and common build environments.

As part of GCC, gfortran benefits from a unified compiler backend, cross-language interoperability, consistent software packaging, and broad platform support. It is widely used in academic research, government and industry scientific computing, and in high-performance computing environments. Development is coordinated with GCC releases, ensuring compatibility with other languages in the GCC ecosystem and with a broad ecosystem of numerical libraries and applications written in Fortran.