initial

android-ndk.sh

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+#!/usr/bin/env bash
+# Android NDK discovery for AndroidCast build scripts.
+# Source this file:  source "$(dirname "$0")/android-ndk.sh"
+#
+# Optional env:
+#   ANDROIDCAST_NDK_VERSION  — pin a version under $HOME/Android/Sdk/ndk (e.g. 29.0.14206865)
+#   ANDROID_NDK_HOME / ANDROID_NDK_ROOT — used when valid
+#
+set -euo pipefail
+
+_androidcast_sdk_base() {
+  printf '%s\n' "${ANDROIDCAST_SDK_BASE:-${ANDROID_HOME:-${ANDROID_SDK_ROOT:-$HOME/Android/Sdk}}}"
+}
+
+# Print absolute NDK root (directory containing ndk-build). Errors on stderr.
+androidcast_find_ndk_root() {
+  local project_root="${1:-}"
+  local ndk="" ndk_root ndk_ver parent pinned
+
+  if [[ -n "$project_root" && -f "$project_root/local.properties" ]]; then
+    ndk="$(sed -n 's/^[[:space:]]*ndk\.dir=//p' "$project_root/local.properties" | tr -d '\r' | head -1)"
+    ndk="${ndk%/}"
+    while [[ -n "$ndk" ]]; do
+      if [[ -x "$ndk/ndk-build" ]]; then
+        realpath "$ndk"
+        return 0
+      fi
+      parent="$(dirname "$ndk")"
+      [[ "$parent" == "$ndk" ]] && break
+      ndk="$parent"
+    done
+  fi
+
+  for ndk in "${ANDROID_NDK_HOME:-}" "${ANDROID_NDK_ROOT:-}"; do
+    ndk="${ndk%/}"
+    if [[ -n "$ndk" && -x "$ndk/ndk-build" ]]; then
+      realpath "$ndk"
+      return 0
+    fi
+  done
+
+  ndk_root="$(_androidcast_sdk_base)/ndk"
+  if [[ ! -d "$ndk_root" ]]; then
+    echo "ERROR: No Android NDK found. Install via SDK Manager ($ndk_root) or set ANDROID_NDK_HOME." >&2
+    return 1
+  fi
+
+  pinned="${ANDROIDCAST_NDK_VERSION:-}"
+  if [[ -n "$pinned" ]]; then
+    if [[ -d "$ndk_root/$pinned" ]]; then
+      ndk_ver="$pinned"
+    else
+      echo "ERROR: ANDROIDCAST_NDK_VERSION=$pinned not found under $ndk_root" >&2
+      return 1
+    fi
+  else
+    ndk_ver="$(ls -1 "$ndk_root" 2>/dev/null | sort -V | tail -n 1 || true)"
+    if [[ -z "$ndk_ver" ]]; then
+      echo "ERROR: No NDK versions under $ndk_root" >&2
+      return 1
+    fi
+  fi
+
+  ndk="$ndk_root/$ndk_ver"
+  if [[ ! -x "$ndk/ndk-build" ]]; then
+    echo "ERROR: ndk-build missing under $ndk" >&2
+    return 1
+  fi
+  realpath "$ndk"
+}
+
+# Print llvm prebuilt bin directory for the current host.
+androidcast_ndk_host_bin() {
+  local ndk_root="${1:?NDK root required}"
+  local os arch host_tag
+  case "$(uname -s)" in
+    Linux) os=linux ;;
+    Darwin) os=darwin ;;
+    *) os="$(uname -s | tr '[:upper:]' '[:lower:]')" ;;
+  esac
+  arch="$(uname -m)"
+  case "$arch" in
+    x86_64 | amd64) arch=x86_64 ;;
+    aarch64 | arm64) arch=aarch64 ;;
+  esac
+  host_tag="${os}-${arch}"
+  if [[ ! -d "$ndk_root/toolchains/llvm/prebuilt/${host_tag}/bin" ]]; then
+    host_tag="linux-x86_64"
+  fi
+  realpath "$ndk_root/toolchains/llvm/prebuilt/${host_tag}/bin"
+}