Add build for lfortran (#98)

* Build lfortran

Author: mattgodbolt

.github/workflows/build.yml

@@ -23,6 +23,7 @@ jobs:
         - vast
         - mads
         - bloaty
+        - lfortran
     steps:
     - name: Docker Setup Buildx
       uses: docker/setup-buildx-action@v2

Dockerfile.lfortran

@@ -0,0 +1,26 @@
+FROM ubuntu:20.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt update -y -q && apt upgrade -y -q && apt update -y -q && \
+    apt install -y -q \
+    bison \
+    build-essential \
+    cmake \
+    curl \
+    git \
+    libzstd-dev \
+    llvm-12-dev \
+    ninja-build \
+    patchelf \
+    python-is-python3 \
+    python3 \
+    re2c \
+    unzip \
+    xz-utils \
+    zlib1g-dev
+
+RUN mkdir -p /root
+COPY lfortran /root/
+COPY common.sh /root/
+
+WORKDIR /root

lfortran/build.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+
+set -euo pipefail
+source common.sh
+
+VERSION="${1}"
+LAST_REVISION="${3-}"
+
+URL="https://github.com/lfortran/lfortran.git"
+if [[ "${VERSION}" == trunk ]]; then
+  VERSION=trunk-$(date +%Y%m%d)
+  BRANCH=main
+  REMOTE=heads/main
+else
+  BRANCH=v"${VERSION}"
+  REMOTE=tags/${BRANCH}
+fi
+
+FULLNAME=lfortran-${VERSION}
+OUTPUT=$2/${FULLNAME}.tar.xz
+REVISION=$(get_remote_revision "${URL}" "${REMOTE}")
+
+initialise "${REVISION}" "${OUTPUT}" "${LAST_REVISION}"
+
+git clone "${URL}" --depth=1 "--branch=${BRANCH}"
+
+OUTPUT=$(realpath "${OUTPUT}")
+DEST=$(realpath prefix)
+SOURCE=$(realpath lfortran)
+
+mkdir build
+cmake \
+    -GNinja \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_CXX_FLAGS_RELEASE="-Wall -Wextra -O3 -funroll-loops -DNDEBUG" \
+    -DWITH_LLVM=yes \
+    -DLFORTRAN_BUILD_ALL=yes \
+    -DWITH_STACKTRACE=no \
+    -DWITH_RUNTIME_STACKTRACE=yes \
+    -DCMAKE_INSTALL_PREFIX="${DEST}" \
+    -DCMAKE_INSTALL_LIBDIR=share/lfortran/lib \
+    -Bbuild \
+    -S"${SOURCE}"
+ninja -C build
+ninja -C build install
+
+mkdir "${DEST}/lib"
+
+# Copy all shared object dependencies into the release directory to create a hermetic build, per
+# Compiler Explorer requirements. Update rpath for these objects to $ORIGIN.
+cp $(ldd "${DEST}/bin/lfortran" | grep -E  '=> /' | grep -Ev 'lib(pthread|c|dl|rt).so' | awk '{print $3}') "${DEST}/lib"
+patchelf --set-rpath '$ORIGIN/../lib' "${DEST}/bin/lfortran"
+
+complete "${DEST}" "${FULLNAME}" "${OUTPUT}"