Modernize conda build

.github/workflows/build-and-test.yaml

@@ -42,7 +42,7 @@ jobs:
       - name: Setup Fortran compiler for Windows
         if: ${{ matrix.os == 'Windows' }}
         run: |
-          echo "[build]`ncompiler=mingw32" | Out-File -Encoding ASCII ~/pydistutils.cfg
+          echo "[build]`ncompiler=flang" | Out-File -Encoding ASCII ~/pydistutils.cfg
       - name: Build and install
         run: |
           python -m pip install --no-deps .

.github/workflows/conda-build.yaml

@@ -1,6 +1,13 @@
 name: Conda-build
 
-on: push
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+  schedule:
+    - cron: '35 4 * * TUE' # Tuesday at 04:35 UTC”
 
 jobs:
 
@@ -13,17 +20,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8"]
+        python-version: ["3.12"]
         os: [Ubuntu, macOS, Windows]
         include:
           - os: Ubuntu
-            environment-file: ci/requirements-linux.yaml
             shell: bash -l {0}
           - os: macOS
-            environment-file: ci/requirements-macos.yaml
             shell: bash -l {0}
           - os: Windows
-            environment-file: ci/requirements-windows.yaml
             shell: powershell
 
     steps:
@@ -33,13 +37,9 @@ jobs:
           miniconda-version: "latest"
           python-version: ${{ matrix.python-version }}
           channels: conda-forge
-      - name: Setup Fortran compiler for Windows
-        if: ${{ matrix.os == 'Windows' }}
-        run: |
-          echo "[build]`ncompiler=mingw32" | Out-File -Encoding ASCII ~/pydistutils.cfg
       - name: Install conda-build
         run: |
-          conda install conda-build
+          conda install -c conda-forge conda-build
       - name: Run conda-build
         run: |
           conda-build -c conda-forge conda-recipe

conda-recipe/meta.yaml

@@ -1,5 +1,5 @@
 {% set name = "minimalf2py" %}
-{% set version = "0.1" %}
+{% set version = "0.2" %}
 
 package:
   name: {{ name|lower }}
@@ -9,32 +9,43 @@ source:
   path: ../
 
 build:
-  skip: True  # [win and py<30]
-  number: 0
+  script: {{ PYTHON }} -m pip install . --no-deps -vv
+  number: 1
 
 requirements:
   build:
-    - {{ compiler('fortran') }}
-    - {{ compiler('m2w64_fortran') }}  # [win]
+    - ninja                                  
+    - pkg-config                             # [unix]
+    - clang                                  # [win]
+    # use flang as fortran compiler on windows (uses clang driver)
+    - flang <18                              # [win]
+    # use llvm linker for both of the above
+    - lld                                    # [win]
     - {{ compiler('c') }}
+    - {{ stdlib("c") }}
+    - {{ compiler('fortran') }}              # [unix]
   host:
-    - libpython  # [win]
+    - compiler-rt                            # [win]
+    - meson-python
+    # limit this for now because incompatible changes
+    # have accumulated in meson_dev channel for 1.4+
+    - meson <1.4                             # [win]
     - python
-    - setuptools
-    - pip
+    - python-build
     - numpy
+    - pip
+    - packaging >=20.0
   run:
     - python
-    - {{ pin_compatible('numpy') }}
-    #- scipy  # uncommenting this line causes conda-build to hang forever on Mac OS
+    - numpy
 
 test:
   requires:
     - pytest
   imports:
     - minimalf2py
   commands:
-    - pytest -v --pyargs minimalf2py.tests
+    - pytest -v --pyargs minimalf2py
 
 extra:
   recipe-maintainers:

environment.yml

@@ -6,4 +6,4 @@ dependencies:
   - numpy
   - fortran-compiler
   - pytest
-  - meson-python
+  - meson-python

minimalf2py/setup.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+from __future__ import division, print_function
+
+def configuration(parent_package='',top_path=None):
+    global config
+    from numpy.distutils.misc_util import Configuration
+    # from numpy.distutils.fcompiler import get_default_fcompiler, CompilerNotFound
+    from numpy.distutils.fcompiler import CompilerNotFound
+
+    compiler = get_default_fcompiler()
+    # set some fortran compiler-dependent flags
+    f90flags = []
+    if compiler == 'gnu95':
+        f90flags.append('-fdefault-real-8')
+    elif compiler == 'intel' or compiler == 'intelem':
+        f90flags.append('-132')
+        f90flags.append('-r8')
+    #  Set aggressive optimization level
+    f90flags.append('-O3')
+    #  Suppress all compiler warnings (avoid huge CI log files)
+    f90flags.append('-w')
+    config = Configuration('minimalf2py',
+                           parent_name=parent_package,
+                           top_path=top_path)
+    config.add_subpackage('tests')
+    config.add_extension(name='add',
+                         sources=['add.f', 'add.pyf'],
+                         extra_f90_compile_args=f90flags,)
+    return config
+
+def get_default_fcompiler(osname=None, platform=None, requiref90=False,
+                          c_compiler=None):
+    """Determine the default Fortran compiler to use for the given
+    platform.
+    This version is copied from numpy.distutils.fcompiler.__init__.py
+    but with a hack to prioritize flang"""
+    from numpy.distutils.fcompiler import available_fcompilers_for_platform, _find_existing_fcompiler
+    from numpy.distutils import log
+
+    matching_compiler_types = available_fcompilers_for_platform(osname,
+                                                                platform)
+    # Move flang to front of list so it has top priority
+    if 'flang' in matching_compiler_types:
+        matching_compiler_types.insert(0, 'flang')
+    log.info("get_default_fcompiler: matching types: '%s'",
+             matching_compiler_types)
+    compiler_type =  _find_existing_fcompiler(matching_compiler_types,
+                                              osname=osname,
+                                              platform=platform,
+                                              requiref90=requiref90,
+                                              c_compiler=c_compiler)
+    return compiler_type
+
+if __name__ == '__main__':
+    print('This is the wrong setup.py file to run')