[WIP] Add scipy

recipes/recipes_emscripten/scipy/build.sh

@@ -1,10 +1,53 @@
 #!/bin/bash
 
-PYODIDE_PACKED=$RECIPE_DIR/scipy-1.11.1-cp311-cp311-emscripten_3_1_45_wasm32.whl
-# unzip 
-unzip $PYODIDE_PACKED
-
-# copy complete folder scipy to side-packages
-mkdir -p $PREFIX/lib/python3.11/site-packages
-cp -r scipy $PREFIX/lib/python3.11/site-packages
-cp -r scipy-1.11.1.dist-info $PREFIX/lib/python3.11/site-packages
+set -ex
+
+# Using flang as a WASM cross-compiler
+# https://github.com/serge-sans-paille/llvm-project/blob/feature/flang-wasm/README.wasm.md
+# https://github.com/conda-forge/flang-feedstock/pull/69
+micromamba install -p $BUILD_PREFIX \
+    conda-forge/label/llvm_rc::libllvm19=19.1.0.rc2 \
+    conda-forge/label/llvm_dev::flang=19.1.0.rc2 \
+    -y --no-channel-priority
+rm $BUILD_PREFIX/bin/clang # links to clang19
+ln -s $BUILD_PREFIX/bin/clang-20 $BUILD_PREFIX/bin/clang # links to emsdk clang
+
+export FC=flang-new
+export FFLAGS="-g --target=wasm32-unknown-emscripten"
+
+# stderr: flang-new: error: unknown argument: '-s'
+# flang-new: error: no such file or directory: 'SIDE_MODULE=1'
+export LDFLAGS=""
+# export FC_LD=wasm-ld
+
+
+mkdir builddir
+
+meson_config_args=(
+    -Dblas=blas
+    -Dlapack=lapack
+    -Duse-pythran=false
+)
+
+meson setup builddir \
+    "${meson_config_args[@]}" \
+    --buildtype=release \
+    --default-library=static \
+    --prefer-static \
+    --prefix=$PREFIX \
+    --wrap-mode=nofallback \
+    --cross-file=$RECIPE_DIR/emscripten.meson.cross
+
+# # -wnx flags mean: --wheel --no-isolation --skip-dependency-check
+# $PYTHON -m build -w -n -x \
+#     -Cbuilddir=builddir \
+#     -Cinstall-args=--tags=runtime,python-runtime,devel \
+#     -Csetup-args=-Dblas=blas \
+#     -Csetup-args=-Dlapack=lapack \
+#     -Csetup-args=-Duse-g77-abi=true \
+#     -Csetup-args=${MESON_ARGS// / -Csetup-args=}
+
+# # copy complete folder scipy to side-packages
+# mkdir -p $PREFIX/lib/python3.11/site-packages
+# cp -r scipy $PREFIX/lib/python3.11/site-packages
+# cp -r scipy-1.11.1.dist-info $PREFIX/lib/python3.11/site-packages

recipes/recipes_emscripten/scipy/emscripten.meson.cross

@@ -0,0 +1,14 @@
+[properties]
+needs_exe_wrapper = true
+skip_sanity_check = true
+longdouble_format = 'IEEE_QUAD_LE' # for numpy
+
+[host_machine]
+system = 'emscripten'
+cpu_family = 'wasm32'
+cpu = 'wasm'
+endian = 'little'
+
+[binaries]
+exe_wrapper = 'node'
+pkg-config = 'pkg-config'

recipes/recipes_emscripten/scipy/recipe.yaml

@@ -1,20 +1,54 @@
 context:
-  version: 1.11.1
   name: scipy
+  version: 1.15.1
 
 package:
   name: ${{ name }}
   version: ${{ version }}
 
+source:
+  - url: https://pypi.org/packages/source/s/${{ name }}/${{ name }}-${{ version }}.tar.gz
+    sha256: 033a75ddad1463970c96a88063a1df87ccfddd526437136b6ee81ff0312ebdf6
+
 build:
-  number: 1
+  number: 0
 
 requirements:
   build:
-  - ${{ compiler('c') }}
+    - python
+    - cross-python_${{ target_platform }}
+    - cython
+    - numpy
+    - pybind11
+    - meson-python
+    - cmake
+    - ninja
+    - pkg-config
+    - ${{ compiler('c') }}
+    - ${{ compiler('cxx') }}
+    - cmake
+    # - ${{ compiler('fortran') }}
+  host:
+    - libblas >=3.12
+    - libcblas >=3.12
+    - liblapack >=3.12
+    - python
+    - cython
+    - python-build
+    - pybind11
+    - pythran
+    - numpy
+    - pip
   run:
-  - openblas
-  - numpy
+    - python
+    # numpy's run-export only requires <3 because not every package
+    # is exposed as deeply to its ABI. scipy however only supports
+    # the two next minor versions after the numpy we build against, see
+    # https://scipy.github.io/devdocs/dev/core-dev/index.html#version-ranges-for-numpy-and-other-dependencies
+    - numpy <2.3
+    # double-check lower bound from
+    # https://github.com/scipy/scipy/blob/v${{ version }}/pyproject.toml#L55
+    - numpy >=1.23.5
 
 tests:
 - script: pytester
@@ -26,6 +60,18 @@ tests:
     - pytester
     run:
     - pytester-run
+
+about:
+  homepage: http://www.scipy.org/
+  license: BSD-3-Clause
+  license_file: LICENSE.txt
+  summary: Scientific Library for Python
+  description: |
+    SciPy is a Python-based ecosystem of open-source software for mathematics,
+    science, and engineering.
+  documentation: http://www.scipy.org/docs.html
+  repository: https://github.com/scipy/scipy
+
 extra:
   recipe-maintainers:
   - DerThorsten