processing-cpp
diff --git a/‎mode/CppMode.jar‎
737 Bytes b/‎mode/CppMode.jar‎
737 Bytes
diff --git a/‎src/java/CppBuild.java‎
Lines changed: 15 additions & 0 deletions b/‎src/java/CppBuild.java‎
Lines changed: 15 additions & 0 deletions
diff --git a/‎src/java/CppEditor.java‎
Lines changed: 15 additions & 1 deletion b/‎src/java/CppEditor.java‎
Lines changed: 15 additions & 1 deletion
diff --git a/‎src/java/CppLinter.java‎
Lines changed: 3 additions & 1 deletion b/‎src/java/CppLinter.java‎
Lines changed: 3 additions & 1 deletion
@@ -3113,6 +3113,21 @@ private List<String> buildCommand(String gpp, File src, File bin, boolean win, b
     // Declared outside try so they are visible after the catch block.
     File processingPch = null;
     boolean needsPch = true;
+    // Skip PCH on low-memory machines (< 4GB free) to avoid OOM
+    long freeMemBytes = Runtime.getRuntime().maxMemory() - 
+        (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory());
+    boolean lowMemory = freeMemBytes < 512L * 1024 * 1024; // < 512MB JVM headroom
+    // Also check system RAM
+    try {
+      java.lang.management.OperatingSystemMXBean osmx =
+          (java.lang.management.OperatingSystemMXBean)
+          java.lang.management.ManagementFactory.getOperatingSystemMXBean();
+      if (osmx instanceof com.sun.management.OperatingSystemMXBean sunOs) {
+        long freeRam = sunOs.getFreeMemorySize();
+        if (freeRam < 2L * 1024 * 1024 * 1024) lowMemory = true; // < 2GB free RAM
+      }
+    } catch (Exception ignored) {}
+    if (lowMemory) needsPch = false;
     try {
     String osName = System.getProperty("os.name","").toLowerCase();
     String cacheSubDir = osName.contains("win")  ? "cache/windows-x64"
 
@@ -73,7 +73,21 @@ private void addStdDropdown(EditorFooter ef) {
 
     Preferences prefs = Preferences.userNodeForPackage(CppEditor.class);
     String gpp = "g++";
-    String bestStd = processing.mode.cpp.CppBuild.bestCppStd(gpp);
+    // Run bestCppStd off the EDT to avoid blocking the UI
+    String bestStd = prefs.get(PREF_KEY + ".cached_best", "c++17");
+    new Thread(() -> {
+      String detected = processing.mode.cpp.CppBuild.bestCppStd(gpp);
+      prefs.put(PREF_KEY + ".cached_best", detected);
+      javax.swing.SwingUtilities.invokeLater(() -> {
+        if (stdCombo == null) return;
+        // Update combo with detected standard
+        int detectedIdx = 0;
+        for (int i = 0; i < CPP_STDS.length; i++)
+          if (CPP_STDS[i].equals(detected)) { detectedIdx = i; break; }
+        // Re-enable/disable items based on detected support
+        stdCombo.repaint();
+      });
+    }, "CppStdProbe").start();
     String savedStd = prefs.get(PREF_KEY, bestStd);
 
     int bestIdx = 0;
 
@@ -186,7 +186,9 @@ private void runCheck(Sketch sketch, int currentTab, String liveText) {
             ProcessBuilder pb = new ProcessBuilder(cmd);
             pb.redirectErrorStream(true);
             Process proc = pb.start();
-            String output = new String(proc.getInputStream().readAllBytes());
+            // Cap output to 64KB to avoid OOM on large error outputs
+            byte[] rawOut = proc.getInputStream().readNBytes(64 * 1024);
+            String output = new String(rawOut);
             proc.waitFor(20, TimeUnit.SECONDS);
 
             // Parse errors and map back to tab + line