gfortran

GNU Fortran compiler

TLDR

Compile Fortran file

$ gfortran [source.f90] -o [output]

Compile with optimization

$ gfortran -O3 [source.f90] -o [output]

Enable warnings

$ gfortran -Wall [source.f90] -o [output]

Debug build

$ gfortran -g [source.f90] -o [output]

Link math library

$ gfortran [source.f90] -o [output] -lm

gfortran is the GNU Fortran compiler, part of GCC. It compiles Fortran 77, 90, 95, 2003, and 2008 standards to native executables.The compiler provides extensive optimization, debugging support, and interoperability with C code. It benefits from GCC's mature infrastructure.gfortran is the standard open source Fortran compiler for scientific computing.

PARAMETERS

FILES

Fortran source files (.f, .f90, .f95).

-o FILE

Output filename.

-c

Compile only, no linking.

-g

Generate debug info.

-O LEVEL

Optimization level (0-3).

-Wall

Enable warnings.

-l LIBRARY

Link library.

--help

Display help information.

INSTALL

sudo apt install gfortran

sudo apk add gfortran

brew install gfortran

nix profile install nixpkgs#gfortran

CAVEATS

Standard compliance varies by feature. Array bounds checking optional. Legacy code may need adaptation.

HISTORY

gfortran replaced g77 as GCC's Fortran compiler starting with GCC 4.0. It supports modern Fortran standards while maintaining compatibility with older code.