Fortran

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Resources

Wikipedia

#fortran (webchat)

Fortran is a general-purpose, compiled imperative programming language that is especially suited to numeric computation and scientific computing.

Installation

GCC

gfortran is GCC's Fortran . Enable fortran to obtain gfortran.

If your package.use is a file:

FILE /etc/portage/package.use

sys-devel/gcc fortran

If your package.use is a folder:

FILE /etc/portage/package.use/gcc-fortran

sys-devel/gcc fortran

For more information, see this wiki.

Flang

Flang is LLVM's fortran compiler.

USE flags for llvm-runtimes/flang-rt LLVM's Fortran runtime

+debug	Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
test	Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)

Data provided by the Gentoo Package Database · Last update: 2025-05-17 12:59 More information about USE flags

Change the FC variable in /etc/portage/make.conf to select the Flang compiler.

FILE /etc/portage/make.conf

FCFLAGS="${FCFLAGS}"
FFLAGS="${FFLAGS}"
F77FLAGS="${F77FLAGS}"

FC="flang"