Add script to build OpenJDK 21 for linux

Bug: 302395149
Test: TH
Change-Id: I2c356e46e2c84a9b402fc917bada0e1b933583ad

build-openjdk21-linux.sh

diff --git a/build-openjdk21-linux.sh b/build-openjdk21-linux.sh
new file mode 100755
index 0000000..e768786
--- /dev/null
+++ b/build-openjdk21-linux.sh
@@ -0,0 +1,136 @@
+#!/bin/bash
+#
+# Builds JDK21, optionally creating distribution artifacts for it.
+# Usage:
+#   build_openjdk21-linux.sh [-q] [-d <dist_dir>] build_dir
+# The JDK is built in <build_dir>.
+# With -d, creates the following artifacts in <dist_dir>:
+#   jdk.zip              archive of the JDK distribution
+#   jdk-debuginfo.zip    .debuginfo files for JDK's shared libraries
+#   configure.log
+#   build.log
+# Specify -q to suppress most of the output noise
+
+set -eu
+declare -r prog="${0##*/}"
+
+function usage() {
+  cat <<EOF
+Usage:
+    $prog [-q] [-d <dist_dir>] <build_dir>
+JDK is built in <build_dir>.
+With -d, creates the artifacts in <dist_dir>.
+With -q, runs with minimum noise.
+EOF
+  exit 1
+}
+
+# Creates the directory if it does not exist and returns its absolute path
+function make_target_dir() {
+  mkdir -p "$1" && realpath "$1"
+}
+
+while getopts 'qd:' opt; do
+  case $opt in
+    d) dist_dir=$(make_target_dir $OPTARG) ;;
+    q) quiet=t ;;
+    *) usage ;;
+  esac
+done
+shift $(($OPTIND-1))
+(($#==1)) || usage
+
+declare -r out_path=$(make_target_dir "$1")
+declare -r sysroot="$out_path/sysroot"
+declare -r build_dir="$out_path/build"
+declare -r top=$(realpath "$(dirname "$0")/../../..")
+declare -r clang_bin="$top/prebuilts/clang/host/linux-x86/clang-r450784e/bin"
+
+# "Installs" given Debian packages into specified directory.
+function unpack_dependencies() {
+  local -r target_dir="$1"
+  local -r ar="$clang_bin/llvm-ar"
+  shift
+  mkdir -p "$target_dir"
+  
+  for deb in "$@"; do
+    # Debian package is actually 'ar' archive. The package files are in data.tar.<type>
+    # member. Extract and untar it.
+    case $("$ar" -t "$deb" | grep data.tar) in
+      data.tar.xz)
+        "$ar" -p "$deb" data.tar.xz | (cd "$target_dir" && tar -Jx) ;;
+      data.tar.bz2)
+        "$ar" -p "$deb" data.tar.bz2 | (cd "$target_dir" && tar -jx) ;;
+      data.tar.gz)
+        "$ar" -p "$deb" data.tar.gz | (cd "$target_dir" && tar -zx) ;;
+      *)
+        printf "%s does not contain expected archive\n" "$deb"
+        exit 1
+        ;;
+    esac
+    [[ -n "${quiet:-}" ]] || printf "Unpacked %s\n" "$deb"
+  done
+
+  # Rewrite absolute symlinks that point outside the sysroot to relative
+  # symlinks to the corresponding files in the sysroot.
+  for link in $(find "${target_dir}" -type l -lname '/*'); do
+    target=$(readlink ${link})
+    relative_target_dir=$(python -c 'import os.path, sys; print(os.path.relpath(*sys.argv[1:]))' ${target_dir} $(dirname ${link}))
+    relative_target=${relative_target_dir}/${target}
+    ln -sfn ${relative_target} ${link}
+  done
+}
+
+# Prepare
+unpack_dependencies "$sysroot" $top/toolchain/jdk/deps/*.deb
+
+function dist_logs() {
+    [[ -n "${dist_dir:-}" && -e "${build_dir}/build.log" ]] && cp "${build_dir}/build.log" "${dist_dir}/"
+    [[ -n "${dist_dir:-}" && -e "${build_dir}/configure-support/config.log" ]] && cp "${build_dir}/configure-support/config.log" "${dist_dir}/"
+}
+trap dist_logs EXIT
+
+# Configure
+mkdir -p "$build_dir"
+[[ -n "${quiet:-}" ]] || set -x
+(cd "$build_dir" && 
+   bash +x "$top/toolchain/jdk/jdk21/configure" \
+     "${quiet:+--quiet}" \
+     --disable-full-docs \
+     --disable-warnings-as-errors \
+     --with-alsa-include="$sysroot/usr/include" \
+     --with-alsa-lib="$sysroot/usr/lib/x86_64-linux-gnu" \
+     --with-boot-jdk="$top/prebuilts/jdk/jdk21/linux-x86" \
+     --with-cups-include="$sysroot/usr/include" \
+     --with-sysroot="$sysroot"\
+     --with-freetype=system \
+     --with-freetype-lib="$sysroot/usr/lib/x86_64-linux-gnu" \
+     --with-freetype-include="$sysroot/usr/include/freetype2" \
+     --with-libpng=bundled \
+     --with-native-debug-symbols=external \
+     --with-stdc++lib=static \
+     --with-toolchain-type=clang \
+     --with-tools-dir="$clang_bin" \
+     --with-version-pre= \
+     --with-version-opt=${BUILD_NUMBER:-0} \
+     --with-vendor-version-string=Android_PDK \
+     --with-zlib=bundled \
+     --x-libraries="$sysroot/usr/lib/x86_64-linux-gnu" \
+     --x-includes="$sysroot/usr/include" \
+     --with-extra-cflags="--sysroot=$sysroot -fno-delete-null-pointer-checks" \
+     --with-extra-cxxflags="--sysroot=$sysroot -fno-delete-null-pointer-checks" \
+     --with-extra-ldflags="--sysroot=$sysroot -fuse-ld=lld" \
+     AR=llvm-ar NM=llvm-nm OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump STRIP=llvm-strip
+)
+
+# Make
+declare -r make_log_level=${quiet:+warn}
+make -C "$build_dir" LOG=${make_log_level:-debug} ${quiet:+-s} images
+[[ -n "${dist_dir:-}" ]] || exit 0
+
+# Dist
+rm -rf "$dist_dir"/{jdk.zip,jdk-debuginfo.zip,build.log,configure.log}
+(cd "$build_dir/images/jdk" && 
+  zip -9rDy${quiet:+q} "$dist_dir"/jdk.zip . -x 'demo/*' -x'man/*' -x'*.debuginfo' && 
+  zip -9rDy${quiet:+q} "$dist_dir"/jdk-debuginfo.zip . -i'*.debuginfo'
+)