feat: add riscv64 clang build with pointer compression enabled

Signed-off-by: Stewart X Addison <sxa@ibm.com>

Author: sxa

README.md

@@ -35,6 +35,7 @@ This list of officially supported platforms is available in the Node.js [BUILDIN
  * **linux-x64-pointer-compression**: Linux x64 binaries compiled with V8 pointer compression enabled (`--experimental-enable-pointer-compression`).
  * **linux-armv6l**: Linux ARMv6 binaries, cross-compiled on Ubuntu 22.04 with a [custom GCC 12 toolchain](https://github.com/rvagg/rpi-newer-crosstools). Binaries are optimized for `armv6zk` which is suitable for Raspberry Pi devices (1, 1+ and Zero in particular).
  * **linux-riscv64**: Linux RISC-V 64-bit, cross-compiled on Ubuntu 24.04 with GCC 14.
+ * **linux-riscv64-pointer-compression**: Linux RISC-V 64-bit, cross-compiled on Ubuntu 24.04 with clang-19 and  --experimental-pointer-compression enabled to reduce RAM usage.
  * **linux-loong64**: Linux LoongArch64, cross-compiled with the Loongson toolchain.
  * **linux-x86**: Linux x86 (32-bit) binaries compiled against libc 2.17. 32-bit Linux binaries were dropped for Node.js 10 and 32-bit support is now considered "Experimental".
  * **linux-x64-usdt**: Linux x64 binaries compiled with DTrace/USDT support.
@@ -56,6 +57,7 @@ Builds are published at <https://unofficial-builds.nodejs.org/download/release/>
 | linux-arm64-musl | All | Added in [#189] |
 | linux-loong64 | >= v23; also v20.10+, v21, v22.14+ | Toolchain upgraded in [#172] |
 | linux-riscv64 | >= v17 | Note: 26 will require [extra CXXFLAGS](https://github.com/nodejs/build/issues/4099#issuecomment-3619150119) |
+| linux-riscv64-pointer-compression | >= v22 | Built with clang instead of GCC ([#222]) |
 | linux-x64-glibc-217 | v18 - v23 | v24+: Python too old in CentOS 7 container ([#177], [#176]) |
 | linux-x64-debug | v18 - v23 | v24+: C++ compiler too old ([#180]) |
 | linux-x64-pointer-compression | v14 - v22 | v23+: CentOS 7 toolchain too old ([#155], [#158]) |
@@ -66,6 +68,7 @@ Builds are published at <https://unofficial-builds.nodejs.org/download/release/>
 [#155]: https://github.com/nodejs/unofficial-builds/pull/155
 [#158]: https://github.com/nodejs/unofficial-builds/pull/158
 [#172]: https://github.com/nodejs/unofficial-builds/pull/172
+[#222]: https://github.com/nodejs/unofficial-builds/pull/222
 [#176]: https://github.com/nodejs/unofficial-builds/issues/176
 [#177]: https://github.com/nodejs/unofficial-builds/pull/177
 [#179]: https://github.com/nodejs/unofficial-builds/pull/179

bin/_config.sh

@@ -8,6 +8,7 @@ recipes=(
   "arm64-musl"
   "riscv64"
   "loong64"
+  "riscv64-pointer-compression"
 
   # Legacy recipes, currently gated out for modern Node.js versions
   "x86"                     # major < 22

recipes/riscv64-pointer-compression/Dockerfile

@@ -0,0 +1,31 @@
+FROM ubuntu:24.04
+
+ARG GID=1000
+ARG UID=1000
+
+RUN apt -y update && \
+    apt -y dist-upgrade && \
+    apt install -y \
+        clang-19 \
+        lld \
+        gcc-riscv64-linux-gnu \
+        g++-riscv64-linux-gnu \
+        ccache \
+        make \
+        git \
+        xz-utils \
+        adduser && \
+    apt install -y less file bzip2 curl adduser joe
+
+RUN (addgroup --gid $GID node || groupmod -n node $(getent group $GID | cut -d: -f1)) \
+    && (adduser --gid $GID --uid $UID --disabled-password --gecos "" node || usermod -l node -g $GID -d /home/node -m $(getent passwd $UID | cut -d: -f1))
+
+COPY --chown=node:node run.sh /home/node/run.sh
+
+VOLUME /home/node/.ccache
+VOLUME /out
+VOLUME /home/node/node.tar.xz
+
+USER node
+
+ ENTRYPOINT [ "/home/node/run.sh" ]

recipes/riscv64-pointer-compression/run.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+
+release_urlbase="$1"
+disttype="$2"
+customtag="$3"
+datestring="$4"
+commit="$5"
+fullversion="$6"
+source_url="$7"
+source_urlbase="$8"
+config_flags="--openssl-no-asm --use_clang --experimental-enable-pointer-compression"
+
+cd /home/node
+
+tar -xf node.tar.xz
+cd "node-${fullversion}"
+
+export CCACHE_BASEDIR="$PWD"
+export CC='ccache clang-19  --target=riscv64-linux-gnu -march=rv64gc'
+export CXX='ccache clang++-19  --target=riscv64-linux-gnu -march=rv64gc'
+export CC_host='ccache clang-19'
+export CXX_host='ccache clang++-19'
+
+#make -j$(getconf _NPROCESSORS_ONLN) binary \
+
+make -j4 binary \
+  DESTCPU="riscv64" \
+  ARCH="riscv64" \
+  VARIATION="" \
+  DISTTYPE="$disttype" \
+  CUSTOMTAG="$customtag" \
+  DATESTRING="$datestring" \
+  COMMIT="$commit" \
+  RELEASE_URLBASE="$release_urlbase" \
+  CONFIG_FLAGS="$config_flags"
+
+# If removal of ICU is desired, add "BUILD_INTL_FLAGS=--with-intl=none" above
+
+mv node-*.tar.?z /out/

recipes/riscv64-pointer-compression/should-build.sh

@@ -0,0 +1,11 @@
+#!/bin/bash -xe
+
+__dirname=$1
+fullversion=$2
+
+. ${__dirname}/_decode_version.sh
+
+decode "$fullversion"
+
+# v20 does not build successfully with clang19
+test "$major" -ge "22"