add emscripten-activation

recipes/emscripten-activation/LICENSE

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+BSD 3-Clause License
+
+Copyright (c) 2012, Anaconda, Inc.
+Copyright (c) 2015-2019, conda-forge
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of the copyright holder nor the names of its
+      contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

recipes/emscripten-activation/activate.sh

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+if [ -z ${CONDA_FORGE_EMSCRIPTEN_ACTIVATED+x} ]; then
+
+    export CONDA_FORGE_EMSCRIPTEN_ACTIVATED=1
+
+    export EMSDK_PYTHON=${CONDA_PREFIX}/bin/python3
+    export PYTHON=${CONDA_PREFIX}/bin/python3
+
+    CONDA_EMSDK_DIR=$CONDA_PREFIX/opt/emsdk
+
+    export EMSCRIPTEN_VERSION=$PKG_VERSION
+    export EMSCRIPTEN_FORGE_EMSDK_DIR=$CONDA_EMSDK_DIR
+
+    # clear all prexisting cmake args / CC / CXX / AR / RANLIB
+    export CC="emcc"
+    export CXX="em++"
+    export AR="emar"
+    export RANLIB="emranlib"
+
+    export CMAKE_ARGS=""
+
+    # set the emscripten toolchain
+    export CMAKE_ARGS="$CMAKE_ARGS -DCMAKE_TOOLCHAIN_FILE=$CONDA_EMSDK_DIR/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake"
+
+    # conda prefix path
+    export CMAKE_ARGS="$CMAKE_ARGS -DCMAKE_PREFIX_PATH=$PREFIX"
+
+    # install prefix
+    export CMAKE_ARGS="$CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=$PREFIX"
+
+    # find root path mode package
+    export CMAKE_ARGS="$CMAKE_ARGS -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ON"
+
+    # fpic
+    export CMAKE_ARGS="$CMAKE_ARGS -DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=true"
+
+    cmake () {
+        emcmake cmake "$@"
+    }
+
+    # useful variables
+    export PY_SIDE_LD_FLAGV
+
+    # basics
+    export EM_FORGE_OPTFLAGS="-O2"
+    export EM_FORGE_DBGFLAGS="-g0"
+
+    # basics ld
+    export EM_FORGE_LDFLAGS_BASE="-s MODULARIZE=1 -s LINKABLE=1 -s EXPORT_ALL=1 -s WASM=1 -std=c++14 -s LZ4=1"
+    export EM_FORGE_LDFLAGS_BASE="${EM_FORGE_OPTFLAGS} ${EM_FORGE_DBGFLAGS} ${EM_FORGE_LDFLAGS_BASE}"
+
+    # basics cflags
+    export EM_FORGE_CFLAGS_BASE="-fPIC"
+    export EM_FORGE_CFLAGS_BASE="${EM_FORGE_OPTFLAGS} ${EM_FORGE_DBGFLAGS} ${EM_FORGE_CFLAGS_BASE}"
+
+    # side module
+    export EM_FORGE_SIDE_MODULE_LDFLAGS="${LDFLAGS_BASE} -s SIDE_MODULE=1"
+    export EM_FORGE_SIDE_MODULE_CFLAGS="${EM_FORGE_CFLAGS_BASE} -I${PREFIX}/include"
+
+    # wasm bigint
+    export LDFLAGS="$LDFLAGS -sWASM_BIGINT"
+
+fi

recipes/emscripten-activation/conda_build_config.yaml

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+CBUILD:
+  - x86_64-conda-linux-gnu
+
+CHOST:
+  - wasm32-unknown-emscripten
+
+cross_target_platform:
+  - emscripten-wasm32
+
+# needs clang 19
+channel_sources:
+  - conda-forge/label/llvm_rc,conda-forge

recipes/emscripten-activation/deactivate.sh

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+#!/bin/bash
+
+unset cmake
+
+unset CONDA_FORGE_EMSCRIPTEN_ACTIVATED
+unset PY_SIDE_LD_FLAGV
+unset EM_FORGE_OPTFLAGS
+unset EM_FORGE_DBGFLAGS
+unset EM_FORGE_LDFLAGS_BASE
+unset EM_FORGE_CFLAGS_BASE
+unset EM_FORGE_SIDE_MODULE_LDFLAGS
+unset EM_FORGE_SIDE_MODULE_CFLAGS

recipes/emscripten-activation/install_emscripten.sh

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+#!/bin/bash
+set -ex
+
+# Copy the [de]activate scripts to $PREFIX/etc/conda/[de]activate.d.
+# This will allow them to be run on environment activation.
+for CHANGE in "activate" "deactivate"
+do
+    mkdir -p "${PREFIX}/etc/conda/${CHANGE}.d"
+    envsubst '$PKG_VERSION' < "${RECIPE_DIR}/${CHANGE}.sh" > "${PREFIX}/etc/conda/${CHANGE}.d/${PKG_NAME}_${CHANGE}.sh"
+done
+
+mkdir -p ${PREFIX}/bin
+cp "${PREFIX}/etc/conda/${CHANGE}.d/${PKG_NAME}_${CHANGE}.sh" ${PREFIX}/bin/activate_emscripten.sh

recipes/emscripten-activation/install_emscripten_impl.sh

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+#!/bin/bash
+set -ex
+
+pushd "${PREFIX}"/bin
+  for BINARY in "em++" "em-config" "emar" "embuilder" "emcc" "emcmake" "emconfigure" "emmake" "emranlib" "emrun" "emscons" "emsize" "emstrip" "emsymbolizer"; do
+    ln -s $BINARY ${CHOST}-$BINARY
+    if [[ "${CBUILD}" != ${CHOST} ]]; then
+      ln -s $BINARY ${CBUILD}-$BINARY
+    fi
+  done
+popd

recipes/emscripten-activation/meta.yaml

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+{% set version = "3.1.58" %}
+# emscripten expects specific clang version, see
+# https://github.com/emscripten-core/emscripten/blob/3.1.58/tools/shared.py#L62
+{% set clang_version = 19 %}
+
+package:
+  name: emscripten-activation
+  version: {{ version }}
+
+build:
+  number: 0
+  skip: true  # [win]
+
+outputs:
+  - name: emscripten_impl_{{ cross_target_platform }}
+    script: install_emscripten_impl.sh   # [unix]
+    requirements:
+      - emscripten ={{ version }}
+      - clang {{ clang_version }}
+      - clangxx {{ clang_version }}
+    test:
+      commands:
+        - {{ CBUILD }}-emcc --version   # [unix]
+        - {{ CHOST }}-emcc --version    # [unix]
+
+  - name: emscripten_{{ cross_target_platform }}
+    script: install_emscripten.sh   # [unix]
+    run_exports:
+      strong:
+        - {{ pin_subpackage("emscripten-abi", max_pin="x.x.x") }}
+    requirements:
+      build:
+        - gettext
+      run:
+        - {{ pin_subpackage("emscripten_impl_" ~ cross_target_platform, exact=True) }}
+    test:
+      files:
+        - testfile.c
+      commands:
+        - emcc ./testfile.c
+        - node a.out.js
+
+  - name: emscripten-abi
+    build:
+      noarch: generic
+    test:
+      commands:
+        - echo "emscripten abi is built."
+
+about:
+  home: https://emscripten.org
+  license: BSD-3-Clause
+  license_file: LICENSE
+  summary: An LLVM-to-WebAssembly Compiler
+  description: Emscripten compiles C and C++ to WebAssembly using LLVM and Binaryen. Emscripten output can run on the Web, in Node.js, and in wasm runtimes.
+  dev_url: https://github.com/emscripten-core/emscripten
+  doc_url: https://emscripten.org/
+
+extra:
+  recipe-maintainers:
+    - DerThorsten
+    - wolfv
+    - h-vetinari
+    - conda-forge/emscripten

recipes/emscripten-activation/testfile.c

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+/*
+ * Copyright 2011 The Emscripten Authors.  All rights reserved.
+ * Emscripten is available under two separate licenses, the MIT license and the
+ * University of Illinois/NCSA Open Source License.  Both these licenses can be
+ * found in the LICENSE file.
+ */
+
+#include <stdio.h>
+
+int main() {
+  printf("hello, world!\n");
+  return 0;
+}
+
+