More robust cmake usage iOS (#695)

Author: CedricGuillemet

Modules/@babylonjs/react-native/package.json

@@ -26,6 +26,7 @@
     "readmeFilename": "README.md",
     "dependencies": {
         "base-64": "^0.1.0",
+        "cmake-runtime": "3.31.0",
         "semver": "^7.3.2"
     },
     "peerDependencies": {
@@ -35,7 +36,6 @@
         "react-native-permissions": ">=3.0.0"
     },
     "devDependencies": {
-        "cmake-runtime": "3.31.0",
         "@babel/core": "^7.8.4",
         "@babel/runtime": "^7.8.4",
         "@babylonjs/core": ">=5.53.1",

Modules/@babylonjs/react-native/postinstall.js

@@ -1,14 +1,29 @@
 const os = require("os");
+const path = require("path");
+
+function getCmakeExecutable() {
+  try {
+    // cmake-runtime ships the cmake binary; resolve it directly to avoid
+    // relying on npx or PATH.
+    const pkgDir = path.dirname(require.resolve('cmake-runtime/package.json'));
+    const pkg = require('cmake-runtime/package.json');
+    // cmake-runtime exposes the binary path via its "bin" field
+    const binRelative = typeof pkg.bin === 'string' ? pkg.bin : pkg.bin['cmake'];
+    return path.join(pkgDir, binRelative);
+  } catch (e) {
+    // Fall back to a cmake on PATH (e.g. homebrew or system install)
+    return 'cmake';
+  }
+}
 
 function iosCMake() {
   const { spawn } = require('child_process');
 
-  const cmake = spawn('npx', [
-    'cmake',
-    '-S', 'ios',
-    '-B', 'Build/iOS',
+  const cmake = spawn(getCmakeExecutable(), [
+    '-S', path.join(__dirname, 'ios'),
+    '-B', path.join(__dirname, 'Build/iOS'),
     '-G', 'Xcode',
-  ], { stdio: 'inherit' });
+  ], { stdio: 'inherit', cwd: __dirname });
 
   cmake.on('exit', code => {
     if (code !== 0) {