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Nix
at master
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let pythonWithPsutil = python3.withPackages (ps: [ ps.psutil ]);in
stdenv.mkDerivation rec { pname = "emscripten"; version = "5.0.6";
llvmEnv = symlinkJoin { name = "emscripten-llvm-${version}"; paths = with llvmPackages; [ clang-unwrapped (lib.getLib clang-unwrapped) lld llvm ]; };
nodeModules = buildNpmPackage { name = "emscripten-node-modules-${version}"; inherit pname version src;
npmDepsHash = "sha256-QW8wnNBBJs8nHsNuczZZevm6ELqtljsDdL21qtFo6pM=";
dontBuild = true;
# Copy node_modules directly. installPhase = '' cp -r node_modules $out/ ''; };
src = fetchFromGitHub { owner = "emscripten-core"; repo = "emscripten"; hash = "sha256-1lsM/qyNS1rRj0D45mSTtTz7ba+OZggdE0t9N4SHLBU="; rev = version; };
strictDeps = true;
nativeBuildInputs = [ makeWrapper python3 ]; buildInputs = [ nodejs ];
patches = [ (replaceVars ./0001-emulate-clang-sysroot-include-logic.patch { resourceDir = "${llvmEnv}/lib/clang/${lib.versions.major llvmPackages.llvm.version}/"; }) ];
buildPhase = '' runHook preBuild
# Make Python scripts executable so patchShebangs will patch their shebangs chmod +x *.py tools/*.py
patchShebangs .
# emscripten 5.0.0 expects LLVM tip-of-tree instead of LLVM 22 sed -i -e "s/EXPECTED_LLVM_VERSION = 23/EXPECTED_LLVM_VERSION = 22/g" tools/shared.py
# fixes cmake support sed -i -e "s/print \('emcc (Emscript.*\)/sys.stderr.write(\1); sys.stderr.flush()/g" emcc.py
sed -i "/^def check_sanity/a\\ return" tools/shared.py
echo "EMSCRIPTEN_ROOT = '$out/share/emscripten'" > .emscripten echo "LLVM_ROOT = '${llvmEnv}/bin'" >> .emscripten echo "NODE_JS = '${nodejs}/bin/node'" >> .emscripten echo "JS_ENGINES = [NODE_JS]" >> .emscripten echo "CLOSURE_COMPILER = ['${closurecompiler}/bin/closure-compiler']" >> .emscripten echo "JAVA = '${jre}/bin/java'" >> .emscripten # to make the test(s) below work # echo "SPIDERMONKEY_ENGINE = []" >> .emscripten echo "BINARYEN_ROOT = '${binaryen}'" >> .emscripten
# make emconfigure/emcmake use the correct (wrapped) binaries sed -i "s|^EMCC =.*|EMCC='$out/bin/emcc'|" tools/shared.py sed -i "s|^EMXX =.*|EMXX='$out/bin/em++'|" tools/shared.py sed -i "s|^EMAR =.*|EMAR='$out/bin/emar'|" tools/shared.py sed -i "s|^EMRANLIB =.*|EMRANLIB='$out/bin/emranlib'|" tools/shared.py
# Fix /tmp symlink issue (macOS: /tmp -> /private/tmp) causing relpath miscalculation sed -i 's/os\.path\.relpath(source_dir, build_dir)/os.path.relpath(source_dir, os.path.realpath(build_dir))/' tools/system_libs.py sed -i 's/os\.path\.relpath(src, build_dir)/os.path.relpath(src, os.path.realpath(build_dir))/' tools/system_libs.py
# Verify the relpath fix was applied grep -q 'os.path.realpath(build_dir)' tools/system_libs.py || (echo "ERROR: relpath fix not applied" && exit 1)
# Functional test: verify relpath resolves correctly through symlinks ${python3}/bin/python3 -c " import os, tempfile src = os.path.abspath('tools/system_libs.py') with tempfile.TemporaryDirectory() as tmpdir: build_dir_real = os.path.realpath(tmpdir) relpath = os.path.relpath(src, build_dir_real) resolved = os.path.normpath(os.path.join(build_dir_real, relpath)) assert resolved == src, f'relpath test failed: {resolved} != {src}' print('relpath symlink fix test passed') "
runHook postBuild '';
installPhase = '' runHook preInstall
appdir=$out/share/emscripten mkdir -p $appdir cp -r . $appdir chmod -R +w $appdir
mkdir -p $appdir/node_modules/.bin cp -r ${nodeModules}/* $appdir/node_modules cp -r ${nodeModules}/* $appdir/node_modules/.bin
cp ${./locate_cache.sh} $appdir/locate_cache.sh chmod +x $appdir/locate_cache.sh
export EM_CACHE=$out/share/emscripten/cache
mkdir -p $out/bin
# Wrap all tools consistently via their .py entry points for b in em++ emcc em-config emar embuilder emcmake emconfigure emmake emranlib emrun emscons emsize; do makeWrapper $appdir/$b.py $out/bin/$b \ --set NODE_PATH ${nodeModules} \ --set EM_EXCLUSIVE_CACHE_ACCESS 1 \ --set PYTHON ${python3}/bin/python \ --run "source $appdir/locate_cache.sh" done
# Create extensionless aliases for tools that need them (e.g., file_packager) for tool in file_packager; do ln -sf $appdir/tools/$tool.py $appdir/tools/$tool done
# Symlinks for CMake toolchain (expects tools in share/emscripten/) for tool in emcc em++ em-config emar emranlib emcmake emconfigure; do ln -sf $out/bin/$tool $appdir/$tool done
# precompile libc (etc.) in all variants: pushd $TMPDIR echo 'int __main_argc_argv( int a, int b ) { return 42; }' >test.c for LTO in -flto ""; do for BIND in "" "--bind"; do for PTHREAD in "" "-pthread"; do $out/bin/emcc $LTO $BIND $PTHREAD test.c || true done done done popd
export PYTHON=${python3}/bin/python export NODE_PATH=${nodeModules} pushd $appdir ${pythonWithPsutil}/bin/python test/runner.py test_hello_world popd
# fail if any .py files still have unpatched shebangs if grep -l '#!/usr/bin/env' $appdir/*.py $appdir/tools/*.py 2>/dev/null; then echo "ERROR: unpatched shebangs found in .py files" exit 1 fi
runHook postInstall '';
passthru = { # HACK: Make emscripten look more like a cc-wrapper to GHC # when building the javascript backend. targetPrefix = "em"; bintools = emscripten; updateScript = nix-update-script { extraArgs = [ "--subpackage" "nodeModules" ]; }; };
meta = { homepage = "https://github.com/emscripten-core/emscripten"; description = "LLVM-to-JavaScript Compiler"; platforms = lib.platforms.all; maintainers = with lib.maintainers; [ qknight raitobezarius willcohen ]; license = lib.licenses.ncsa; };}