Harden LinuxCNC wasm and native probe workflows

test-linuxcnc-wasm-source-syntax.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cd "$(dirname "$0")"
+
+linuxcnc_root=${LINUXCNC_ROOT:-../linuxcnc}
+manifest=${1:-linuxcnc-rs274-wasm-source-files.txt}
+cxx=${CXX:-g++}
+
+if [[ ! -f "$manifest" ]]; then
+    echo "missing manifest: $manifest" >&2
+    exit 1
+fi
+
+if [[ ! -d "$linuxcnc_root" ]]; then
+    echo "missing LinuxCNC root: $linuxcnc_root" >&2
+    exit 1
+fi
+
+common_flags=(
+    -std=c++20
+    -DULAPI
+    -fsyntax-only
+    -include wctype.h
+    -I "$(pwd)/core/include"
+    -I "$(pwd)/core/src"
+    -I "$(pwd)/core/wasm_shims"
+    -I "$linuxcnc_root/src"
+    -I "$linuxcnc_root/src/emc"
+    -I "$linuxcnc_root/src/emc/nml_intf"
+    -I "$linuxcnc_root/src/emc/rs274ngc"
+    -I "$linuxcnc_root/src/emc/motion"
+    -I "$linuxcnc_root/include"
+)
+
+sources=()
+while IFS=: read -r group path note; do
+    case "$group" in
+        core)
+            if [[ ! -f "$linuxcnc_root/$path" ]]; then
+                echo "missing manifest source: $path" >&2
+                exit 1
+            fi
+            sources+=("$path")
+            ;;
+        ""|\#*|blocked)
+            ;;
+        *)
+            echo "unknown manifest group: $group" >&2
+            exit 1
+            ;;
+    esac
+done < "$manifest"
+
+for source in "${sources[@]}"; do
+    "$cxx" "${common_flags[@]}" "$linuxcnc_root/$source"
+done
+
+echo "linuxcnc wasm-safe source syntax probe passed (${#sources[@]} files)"