Add a Meson build system

.cirrus.yml

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+task:
+  matrix:
+    - name: FreeBSD
+      freebsd_instance:
+        image: freebsd-13-2-release-amd64
+    - name: MacOS M1
+      macos_instance:
+        image: ghcr.io/cirruslabs/macos-monterey-base:latest
+  dependencies_script: |
+    echo $(uname)
+    if [ "$(uname)" = "FreeBSD" ]; then
+      pkg install -y py39-pip meson bash gcc12
+    else
+      brew install python meson gcc
+    fi
+  configure_script: |
+    if [ "$(uname -s)" = "FreeBSD" ]; then
+      FC=gfortran12 CC=gcc12 CXX=g++12 meson setup builddir
+    else
+      FC=gfortran-12 CC=gcc-12 CXX=g++-12 meson setup builddir
+    fi
+  build_script: |
+    meson compile -C builddir
+  install_script: |
+    meson install -C builddir
+  test_script: |
+    meson test -C builddir
+  on_failure:
+    log_artifacts:
+      path: builddir/meson-logs/*log.txt

.github/workflows/meson.yml

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+name: Meson
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  build:
+    name: SIFDecode/${{ matrix.os }}/${{ matrix.fc_cmd }}/${{ matrix.compiler_version }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, ubuntu-latest, macos-latest]
+        compiler_version: [12]
+        include:
+          - compiler: gnu
+            fc_cmd: gfortran
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Check out SIFDecode
+        uses: actions/checkout@v3
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+
+      - name: Install Meson and Ninja
+        run: pip install meson ninja
+
+      - name: Install GNU compilers
+        if: matrix.compiler == 'gnu'
+        uses: awvwgk/setup-fortran@main
+        with:
+          compiler: gcc
+          version: ${{ matrix.compiler_version }}
+
+      - name: Install classic Intel compilers
+        if: matrix.compiler == 'intel'
+        uses: awvwgk/setup-fortran@main
+        with:
+          compiler: intel-classic
+          version: ${{ matrix.compiler_version }}
+
+      - name: Install nextgen Intel compilers
+        if: matrix.compiler == 'intel-llvm'
+        uses: awvwgk/setup-fortran@main
+        with:
+          compiler: intel
+          version: ${{ matrix.compiler_version }}
+
+      # Uncomment this section to obtain ssh access to VM
+      # - name: Setup tmate session
+      # if: matrix.os == 'windows-latest'
+      # uses: mxschmitt/action-tmate@v3
+
+      - name: Setup SIFDecode
+        shell: bash
+        run: |
+          meson setup builddir --prefix=$GITHUB_WORKSPACE/../meson
+        env:
+          FC: ${{ matrix.fc_cmd }}
+
+      - name: Build SIFDecode
+        shell: bash
+        run: |
+          meson compile -C builddir
+      - uses: actions/upload-artifact@v3
+        if: failure()
+        with:
+          name: ${{ matrix.os }}_${{ matrix.fc_cmd }}_${{ matrix.compiler_version }}_meson-log.txt
+          path: builddir/meson-logs/meson-log.txt
+
+      - name: Install SIFDecode
+        shell: bash
+        run: |
+          meson install -C builddir
+      - uses: actions/upload-artifact@v3
+        if: failure()
+        with:
+          name: ${{ matrix.os }}_${{ matrix.fc_cmd }}_${{ matrix.compiler_version }}_install-log.txt
+          path: builddir/meson-logs/install-log.txt

.gitignore

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+objects/*
+modules/*
+versions/*
+makefiles/*
+bin/sys/*

install_modules.py

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+#!/usr/bin/env python3
+# Initially proposed by Sebastian Ehlert (@awvwgk)
+from os import environ, listdir, makedirs, walk
+from os.path import join, isdir, exists
+from sys import argv
+from shutil import copy
+
+build_dir = environ["MESON_BUILD_ROOT"]
+if "MESON_INSTALL_DESTDIR_PREFIX" in environ:
+    install_dir = environ["MESON_INSTALL_DESTDIR_PREFIX"]
+else:
+    install_dir = environ["MESON_INSTALL_PREFIX"]
+
+include_dir = "modules"
+module_dir = join(install_dir, include_dir)
+
+modules = []
+# finds $build_dir/**/*.mod and $build_dir/**/*.smod
+for root, dirs, files in walk(build_dir):
+    modules += [join(root, f) for f in files if f.endswith(".mod") or f.endswith(".smod")]
+
+if not exists(module_dir):
+    makedirs(module_dir)
+
+for mod in modules:
+    print("Installing", mod, "to", module_dir)
+    copy(mod, module_dir)

meson.build

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+project(
+  'SIFDecode',
+  'fortran',
+  version: '2023.10.13',
+  meson_version: '>= 0.63.0',
+  default_options: [
+    'buildtype=release',
+    'libdir=lib',
+    'default_library=shared',
+    'warning_level=0',
+  ],
+)
+
+libsifdecode_src = []
+sifdecode_binaries = []
+
+# Sources
+subdir('src/check')
+subdir('src/decode')
+subdir('src/select')
+
+# Library
+libsifdecode = library('sifdecode',
+                       sources : libsifdecode_src,
+                       install : true)
+
+# Binaries
+foreach binary: sifdecode_binaries
+  binname = binary[0]
+  binfile = binary[1]
+  executable(binname,
+             sources : binfile,
+             link_with : libsifdecode,
+             install : true)
+endforeach
+
+# Fortran modules
+script_modules = files('install_modules.py')
+meson.add_install_script(script_modules)

src/check/meson.build

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+libsifdecode_src += files('check_derivs.f90', 'random.f90')
+# sifdecode_binaries += [['check_derivs_main', files('check_derivs_main.f90')]]

src/decode/meson.build

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+libsifdecode_src += files('sifdecode.f90')
+sifdecode_binaries += [['sifdecode_main', files('sifdecode_main.f90')]]

src/select/meson.build

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+sifdecode_binaries += [['clsf', files('clsf.f')],
+                       ['slct', files('slct.f')]]