New package: emscripten

packages/emscripten/build.sh

@@ -0,0 +1,111 @@
+TERMUX_PKG_HOMEPAGE=https://emscripten.org/
+TERMUX_PKG_DESCRIPTION="Emscripten: An LLVM-to-WebAssembly Compiler"
+TERMUX_PKG_LICENSE="MIT"
+TERMUX_PKG_MAINTAINER="@termux"
+TERMUX_PKG_VERSION=2.0.16
+TERMUX_PKG_SRCURL=https://github.com/emscripten-core/emscripten/archive/${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_SHA256=6a1732596349637953ba5c403c47ce064c80773816050066a5b130293666f59c
+TERMUX_PKG_DEPENDS="python, nodejs, binaryen"
+TERMUX_PKG_BUILD_IN_SRC=true
+TERMUX_PKG_HOSTBUILD=true
+
+# https://github.com/emscripten-core/emscripten/blob/main/docs/packaging.md
+
+# https://github.com/emscripten-core/emscripten/issues/11362
+# switch to stable LLVM and drop building here once above is fixed
+# build from tip-of-tree main branch for now
+
+# https://chromium.googlesource.com/emscripten-releases/+/refs/heads/master/DEPS
+# refer llvm_project_revision above
+LLVM_COMMIT_HASH=a1d83776bfa186422ec2e1b19eb9d12c96c33348
+LLVM_CHECKSUM=dba8f95f55f1dbe45a7408056a5135a5c739f6504f5a29c13bf740db50a6f933
+
+# https://github.com/emscripten-core/emsdk/blob/master/emsdk.py
+LLVM_BUILD_ARGS="
+-DCMAKE_BUILD_TYPE=Release
+-DPython3_EXECUTABLE=$(which python3)
+-DLLVM_INCLUDE_EXAMPLES=OFF
+-DCLANG_INCLUDE_EXAMPLES=OFF
+-DLLVM_INCLUDE_TESTS=OFF
+-DCLANG_INCLUDE_TESTS=OFF
+-DLLVM_ENABLE_ASSERTIONS=OFF
+-DLLVM_ENABLE_PROJECTS='clang;clang;lld;lld'
+-DLLVM_TABLEGEN=$TERMUX_PKG_HOSTBUILD_DIR/bin/llvm-tblgen
+-DCLANG_TABLEGEN=$TERMUX_PKG_HOSTBUILD_DIR/bin/clang-tblgen
+-DGENERATOR_IS_MULTI_CONFIG=ON
+"
+
+termux_step_post_get_source() {
+	termux_download \
+		"https://github.com/llvm/llvm-project/archive/$LLVM_COMMIT_HASH.zip" \
+		"$TERMUX_PKG_CACHEDIR/llvm.zip" \
+		"$LLVM_CHECKSUM"
+	unzip -qo "$TERMUX_PKG_CACHEDIR/llvm.zip" -d "$TERMUX_PKG_CACHEDIR"
+}
+
+termux_step_host_build() {
+	termux_setup_cmake
+	cmake $LLVM_BUILD_ARGS "$TERMUX_PKG_CACHEDIR/llvm-project-$LLVM_COMMIT_HASH/llvm"
+	cmake --build "$TERMUX_PKG_HOSTBUILD_DIR" -j "$TERMUX_MAKE_PROCESSES" --target llvm-tblgen clang-tblgen
+}
+
+termux_step_make() {
+	# from packages/libllvm/build.sh
+	export LLVM_DEFAULT_TARGET_TRIPLE=${CCTERMUX_HOST_PLATFORM/-/-unknown-}
+	export LLVM_TARGET_ARCH
+	if [ $TERMUX_ARCH = "arm" ]; then
+		LLVM_TARGET_ARCH=ARM
+	elif [ $TERMUX_ARCH = "aarch64" ]; then
+		LLVM_TARGET_ARCH=AArch64
+	elif [ $TERMUX_ARCH = "i686" ] || [ $TERMUX_ARCH = "x86_64" ]; then
+		LLVM_TARGET_ARCH=X86
+	else
+		termux_error_exit "Invalid arch: $TERMUX_ARCH"
+	fi
+
+	LLVM_BUILD_ARGS+=" -DLLVM_TARGET_ARCH=$LLVM_TARGET_ARCH"
+	LLVM_BUILD_ARGS+=" -DLLVM_TARGETS_TO_BUILD=WebAssembly;$LLVM_TARGET_ARCH"
+	LLVM_BUILD_ARGS+=" -DLLVM_HOST_TRIPLE=$LLVM_DEFAULT_TARGET_TRIPLE"
+	LLVM_BUILD_ARGS+=" -DCMAKE_INSTALL_PREFIX=$TERMUX_PREFIX/lib/emscripten-llvm"
+
+	termux_setup_cmake
+	if [ -z $(grep "$LLVM_COMMIT_HASH" "$TERMUX_PKG_CACHEDIR/build/TERMUX_BUILT_FOR_${TERMUX_PKG_VERSION}" 2>/dev/null) ]; then
+		rm -fr "$TERMUX_PKG_CACHEDIR/build"
+	fi
+	cmake $LLVM_BUILD_ARGS -S "$TERMUX_PKG_CACHEDIR/llvm-project-$LLVM_COMMIT_HASH/llvm" -B "$TERMUX_PKG_CACHEDIR/build"
+	echo "$LLVM_COMMIT_HASH" > "$TERMUX_PKG_CACHEDIR/build/TERMUX_BUILT_FOR_${TERMUX_PKG_VERSION}"
+	cmake --build "$TERMUX_PKG_CACHEDIR/build" -j "$TERMUX_MAKE_PROCESSES" --target install
+}
+
+termux_step_make_install() {
+	# skip using Makefile which does host npm install, tar archive and extract steps
+	rm -fr "$TERMUX_PREFIX/lib/emscripten"
+	./tools/install.py "$TERMUX_PREFIX/lib/emscripten"
+
+	# first run generates .emscripten and exits immediately
+	./emcc
+	sed -i .emscripten -e "s|'EMSCRIPTEN'.*|'EMSCRIPTEN', '$TERMUX_PREFIX/lib/emscripten')) # directory|"
+	sed -i .emscripten -e "s|'LLVM'.*|'LLVM', '$TERMUX_PREFIX/lib/emscripten-llvm/bin')) # directory|"
+	sed -i .emscripten -e "s|'BINARYEN'.*|'BINARYEN', '$TERMUX_PREFIX')) # directory|"
+	sed -i .emscripten -e "s|'NODE'.*|'NODE', '$TERMUX_PREFIX/bin/node')) # executable|"
+	install -Dm644 "$TERMUX_PKG_SRCDIR/.emscripten" "$TERMUX_PREFIX/lib/emscripten/.emscripten"
+
+	# https://github.com/emscripten-core/emscripten/issues/9098
+	echo "#!$TERMUX_PREFIX/bin/sh" > "$TERMUX_PKG_TMPDIR/emscripten.sh"
+	echo "export PATH=\$PATH:$TERMUX_PREFIX/lib/emscripten" >> "$TERMUX_PKG_TMPDIR/emscripten.sh"
+	echo "export EMCC_CORES=1" >> "$TERMUX_PKG_TMPDIR/emscripten.sh"
+	install -Dm644 "$TERMUX_PKG_TMPDIR/emscripten.sh" "$TERMUX_PREFIX/etc/profile.d/emscripten.sh"
+}
+
+termux_step_create_debscripts() {
+	echo "#!$TERMUX_PREFIX/bin/sh" > ./postinst
+	echo "echo \"Running \"npm ci\" in $TERMUX_PREFIX/lib/emscripten ...\"" >> ./postinst
+	echo "cd \"$TERMUX_PREFIX/lib/emscripten\"" >> ./postinst
+	echo "npm ci" >> ./postinst
+
+	echo "#!$TERMUX_PREFIX/bin/sh" > ./postrm
+	echo "case \"\$1\" in" >> ./postrm
+	echo "purge|remove)" >> ./postrm
+	echo "	rm -fr \"$TERMUX_PREFIX/lib/emscripten\" ;;" >> ./postrm
+	echo "esac" >> ./postrm
+}

packages/emscripten/tools_install.py.patch

@@ -0,0 +1,12 @@
+--- a/tools/install.py
++++ b/tools/install.py
+@@ -37,6 +37,9 @@
+
+
+ def add_revision_file(target):
++  if not os.path.exists('.git'):
++    print('skipping generate emscripten-revision.txt as .git directory does not exist')
++    return
+   # text=True would be better than encoding here, but it's only supported in 3.7+
+   git_hash = subprocess.check_output(['git', 'rev-parse', 'HEAD'], encoding='utf-8').strip()
+   with open(os.path.join(target, 'emscripten-revision.txt'), 'w') as f: