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

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{ stdenv, fetchFromGitHub, emscriptenfastcomp, python, nodejs, closurecompiler, jre }:
let
rev = "1.36.4";
appdir = "share/emscripten";
in
stdenv.mkDerivation {
name = "emscripten-${rev}";
src = fetchFromGitHub {
owner = "kripken";
repo = "emscripten";
sha256 = "1c9592i891z1v9rp4a4lnsp14nwiqfxnh37g6xwwjd1bqx7x4hn7";
inherit rev;
};
buildCommand = ''
mkdir -p $out/${appdir}
cp -r $src/* $out/${appdir}
chmod -R +w $out/${appdir}
grep -rl '^#!/usr.*python' $out/${appdir} | xargs sed -i -s 's@^#!/usr.*python.*@#!${python}/bin/python@'
sed -i -e "s,EM_CONFIG = '~/.emscripten',EM_CONFIG = '$out/${appdir}/config'," $out/${appdir}/tools/shared.py
sed -i -e 's,^.*did not see a source tree above the LLVM.*$, return True,' $out/${appdir}/tools/shared.py
sed -i -e 's,def check_sanity(force=False):,def check_sanity(force=False):\n return,' $out/${appdir}/tools/shared.py
mkdir $out/bin
ln -s $out/${appdir}/{em++,em-config,emar,embuilder.py,emcc,emcmake,emconfigure,emlink.py,emmake,emranlib,emrun,emscons} $out/bin
echo "EMSCRIPTEN_ROOT = '$out/${appdir}'" > $out/${appdir}/config
echo "LLVM_ROOT = '${emscriptenfastcomp}'" >> $out/${appdir}/config
echo "PYTHON = '${python}/bin/python'" >> $out/${appdir}/config
echo "NODE_JS = '${nodejs}/bin/node'" >> $out/${appdir}/config
echo "JS_ENGINES = [NODE_JS]" >> $out/${appdir}/config
echo "COMPILER_ENGINE = NODE_JS" >> $out/${appdir}/config
echo "CLOSURE_COMPILER = '${closurecompiler}/share/java/compiler.jar'" >> $out/${appdir}/config
echo "JAVA = '${jre}/bin/java'" >> $out/${appdir}/config
'';
meta = with stdenv.lib; {
homepage = https://github.com/kripken/emscripten;
description = "An LLVM-to-JavaScript Compiler";
platforms = platforms.all;
maintainers = with maintainers; [ qknight matthewbauer ];
license = licenses.ncsa;
};
}