Lfortran is a unique Fortran compiler in that it is:

• Interactive (or compiles as usual from command line)
• works with Jupyter notebook
• targets modern Fortran
• loads module files from other compilers

Quite a unique feature set, but still quite experimental.

This method is for installing Lfortran from the Git repo in Linux / Windows Subsystem for Linux. It assumes Anaconda / Miniconda Python.

Install Java JRE

apt install default-java

Install Antler

mkdir ~/ext
cd ~/ext

curl -O  https://www.antlr.org/download/antlr-4.7.2-complete.jar

Setup Python for Lfortran

conda create -n lfortran python=3.7 pytest llvmlite prompt_toolkit
conda activate lfortran
pip install antlr4-python3-runtime

Add Antler to path:

export CLASSPATH="$HOME/ext/antlr-4.7.2-complete.jar:$CLASSPATH"

Clone Lfortran repo

cd ~
git clone https://gitlab.com/lfortran/lfortran
cd lfortran

Complete Lfortran install

./build.sh

Run the selftest

pytest