nixpkgs/pkgs/development/compilers/emscripten/default.nix

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{ stdenv, fetchFromGitHub, python3, nodejs, closurecompiler
, jre, binaryen
, llvmPackages_11
, symlinkJoin, makeWrapper
, mkYarnModules
}:
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stdenv.mkDerivation rec {
pname = "emscripten";
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version = "2.0.1";
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llvmEnv = symlinkJoin {
name = "emscripten-llvm-${version}";
paths = with llvmPackages_11; [ clang-unwrapped lld llvm ];
};
nodeModules = mkYarnModules {
name = "emscripten-node-modules-${version}";
inherit pname version;
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# it is vitally important the the package.json has name and version fields
packageJSON = ./package.json;
yarnLock = ./yarn.lock;
yarnNix = ./yarn.nix;
};
src = fetchFromGitHub {
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owner = "emscripten-core";
repo = "emscripten";
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sha256 = "06dsd819qjv4n2ihrz1mpn5aigmbv0gpkm7iw06wrqx30nzphnpk";
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rev = version;
};
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nativeBuildInputs = [ makeWrapper ];
buildInputs = [ nodejs python3 ];
outputs = [ "out" "appdir" ];
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buildPhase = ''
patchShebangs .
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# fixes cmake support
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sed -i -e "s/print \('emcc (Emscript.*\)/sys.stderr.write(\1); sys.stderr.flush()/g" emcc.py
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# disables cache in user home, use installation directory instead
sed -i '/^def/!s/root_is_writable()/True/' tools/shared.py
sed -i "/^def check_sanity/a\\ return" tools/shared.py
# required for wasm2c
ln -s ${nodeModules}/node_modules .
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echo "EMSCRIPTEN_ROOT = '$appdir'" > .emscripten
echo "LLVM_ROOT = '${llvmEnv}/bin'" >> .emscripten
echo "NODE_JS = '${nodejs}/bin/node'" >> .emscripten
echo "JS_ENGINES = [NODE_JS]" >> .emscripten
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echo "CLOSURE_COMPILER = ['${closurecompiler}/bin/closure-compiler']" >> .emscripten
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echo "JAVA = '${jre}/bin/java'" >> .emscripten
# to make the test(s) below work
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# echo "SPIDERMONKEY_ENGINE = []" >> .emscripten
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echo "BINARYEN_ROOT = '${binaryen}'" >> .emscripten
'';
installPhase = ''
rm -rf cache
cp -r . $appdir
chmod -R +w $appdir
mkdir -p $out/bin
for b in em++ em-config emar embuilder.py emcc emcmake emconfigure emlink.py emmake emranlib emrun emscons; do
makeWrapper $appdir/$b $out/bin/$b \
--set NODE_PATH ${nodeModules}/node_modules \
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--set EM_EXCLUSIVE_CACHE_ACCESS 1 \
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--set PYTHON ${python3}/bin/python
done
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# precompile libc in all four variants:
# wasm, wasm-pic, wasm-lto, wasm-lto-pic
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export PYTHON=${python3}/bin/python
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export NODE_PATH=${nodeModules}/node_modules
pushd $appdir
for lto in wasm2 wasmlto2; do
for pic in test_hello_world test_relocatable_void_function; do
python tests/runner.py $lto.$pic
done
done
popd
'';
meta = with stdenv.lib; {
homepage = "https://github.com/emscripten-core/emscripten";
description = "An LLVM-to-JavaScript Compiler";
platforms = platforms.all;
maintainers = with maintainers; [ qknight matthewbauer ];
license = licenses.ncsa;
};
}