SAP · SapMachine · Feb 5, 2026 · Feb 5, 2026 · Feb 5, 2026 · Feb 5, 2026
diff --git a/doc/hotspot-style.html b/doc/hotspot-style.html
@@ -965,9 +965,8 @@ <h3 id="nullptr">nullptr</h3>
 <code>NULL</code>.</p>
 <p>Don't use (constant expression or literal) 0 for pointers. Note that
 C++14 removed non-literal 0 constants from <em>null pointer
-constants</em>, though some compilers continue to treat them as such.
-For historical reasons there may be lingering uses of 0 as a
-pointer.</p>
+constants</em>, though some compilers continue to treat them as
+such.</p>
 <h3 id="atomic">&lt;atomic&gt;</h3>
 <p>Do not use facilities provided by the <code>&lt;atomic&gt;</code>
 header (<a

diff --git a/doc/hotspot-style.md b/doc/hotspot-style.md
@@ -884,8 +884,7 @@ rather than `NULL`.  See the paper for reasons to avoid `NULL`.
 
 Don't use (constant expression or literal) 0 for pointers.  Note that C++14
 removed non-literal 0 constants from _null pointer constants_, though some
-compilers continue to treat them as such.  For historical reasons there may be
-lingering uses of 0 as a pointer.
+compilers continue to treat them as such.
 
 ### &lt;atomic&gt;
 

diff --git a/make/autoconf/flags-cflags.m4 b/make/autoconf/flags-cflags.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -209,7 +209,10 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],
       BUILD_CC_DISABLE_WARNING_PREFIX="-wd"
       CFLAGS_WARNINGS_ARE_ERRORS="-WX"
 
-      WARNINGS_ENABLE_ALL="-W3"
+      WARNINGS_ENABLE_ALL_NORMAL="-W3"
+      WARNINGS_ENABLE_ADDITIONAL=""
+      WARNINGS_ENABLE_ADDITIONAL_CXX=""
+      WARNINGS_ENABLE_ADDITIONAL_JVM=""
       DISABLED_WARNINGS="4800 5105"
       ;;
 
@@ -218,14 +221,16 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],
       BUILD_CC_DISABLE_WARNING_PREFIX="-Wno-"
       CFLAGS_WARNINGS_ARE_ERRORS="-Werror"
 
+      WARNINGS_ENABLE_ALL_NORMAL="-Wall -Wextra"
+
       # Additional warnings that are not activated by -Wall and -Wextra
-      WARNINGS_ENABLE_ADDITIONAL="-Winvalid-pch -Wpointer-arith -Wreturn-type \
+      WARNINGS_ENABLE_ADDITIONAL="-Wformat=2 \
+          -Winvalid-pch -Wpointer-arith -Wreturn-type \
           -Wsign-compare -Wtrampolines -Wtype-limits -Wundef -Wuninitialized \
           -Wunused-const-variable=1 -Wunused-function -Wunused-result \
           -Wunused-value"
       WARNINGS_ENABLE_ADDITIONAL_CXX="-Woverloaded-virtual -Wreorder"
-      WARNINGS_ENABLE_ALL_CFLAGS="-Wall -Wextra -Wformat=2 $WARNINGS_ENABLE_ADDITIONAL"
-      WARNINGS_ENABLE_ALL_CXXFLAGS="$WARNINGS_ENABLE_ALL_CFLAGS $WARNINGS_ENABLE_ADDITIONAL_CXX"
+      WARNINGS_ENABLE_ADDITIONAL_JVM="-Wzero-as-null-pointer-constant"
 
       # These warnings will never be turned on, since they generate too many
       # false positives.
@@ -241,16 +246,24 @@ AC_DEFUN([FLAGS_SETUP_WARNINGS],
       BUILD_CC_DISABLE_WARNING_PREFIX="-Wno-"
       CFLAGS_WARNINGS_ARE_ERRORS="-Werror"
 
+      WARNINGS_ENABLE_ALL_NORMAL="-Wall -Wextra"
+
       # Additional warnings that are not activated by -Wall and -Wextra
-      WARNINGS_ENABLE_ADDITIONAL="-Wpointer-arith -Wsign-compare -Wreorder \
+      WARNINGS_ENABLE_ADDITIONAL="-Wformat=2 \
+          -Wpointer-arith -Wsign-compare -Wreorder \
           -Wunused-function -Wundef -Wunused-value -Woverloaded-virtual"
-      WARNINGS_ENABLE_ALL="-Wall -Wextra -Wformat=2 $WARNINGS_ENABLE_ADDITIONAL"
+      WARNINGS_ENABLE_ADDITIONAL_CXX=""
+      WARNINGS_ENABLE_ADDITIONAL_JVM="-Wzero-as-null-pointer-constant"
 
       # These warnings will never be turned on, since they generate too many
       # false positives.
       DISABLED_WARNINGS="unknown-warning-option unused-parameter"
       ;;
   esac
+  WARNINGS_ENABLE_ALL="$WARNINGS_ENABLE_ALL_NORMAL $WARNINGS_ENABLE_ADDITIONAL"
+  WARNINGS_ENABLE_ALL_CXX="$WARNINGS_ENABLE_ALL $WARNINGS_ENABLE_ADDITIONAL_CXX"
+  WARNINGS_ENABLE_ALL_JVM="$WARNINGS_ENABLE_ALL_CXX $WARNINGS_ENABLE_ADDITIONAL_JVM"
+
   AC_SUBST(DISABLE_WARNING_PREFIX)
   AC_SUBST(BUILD_CC_DISABLE_WARNING_PREFIX)
   AC_SUBST(CFLAGS_WARNINGS_ARE_ERRORS)
@@ -604,19 +617,9 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_HELPER],
   ADLC_LANGSTD_CXXFLAGS="$LANGSTD_CXXFLAGS"
 
   # CFLAGS WARNINGS STUFF
-  # Set JVM_CFLAGS warning handling
-  if test "x$TOOLCHAIN_TYPE" = xgcc; then
-    WARNING_CFLAGS_JDK_CONLY="$WARNINGS_ENABLE_ALL_CFLAGS"
-    WARNING_CFLAGS_JDK_CXXONLY="$WARNINGS_ENABLE_ALL_CXXFLAGS"
-    WARNING_CFLAGS_JVM="$WARNINGS_ENABLE_ALL_CXXFLAGS"
-
-  elif test "x$TOOLCHAIN_TYPE" = xclang; then
-    WARNING_CFLAGS="$WARNINGS_ENABLE_ALL"
-
-  elif test "x$TOOLCHAIN_TYPE" = xmicrosoft; then
-    WARNING_CFLAGS="$WARNINGS_ENABLE_ALL"
-
-  fi
+  WARNING_CFLAGS_JDK_CONLY="$WARNINGS_ENABLE_ALL"
+  WARNING_CFLAGS_JDK_CXXONLY="$WARNINGS_ENABLE_ALL_CXX"
+  WARNING_CFLAGS_JVM="$WARNINGS_ENABLE_ALL_JVM"
 
   # Set some additional per-OS defines.
 
@@ -878,12 +881,12 @@ AC_DEFUN([FLAGS_SETUP_CFLAGS_CPU_DEP],
   CFLAGS_JVM_COMMON="$ALWAYS_CFLAGS_JVM $ALWAYS_DEFINES_JVM \
       $TOOLCHAIN_CFLAGS_JVM ${$1_TOOLCHAIN_CFLAGS_JVM} \
       $OS_CFLAGS $OS_CFLAGS_JVM $CFLAGS_OS_DEF_JVM $DEBUG_CFLAGS_JVM \
-      $WARNING_CFLAGS $WARNING_CFLAGS_JVM $JVM_PICFLAG $FILE_MACRO_CFLAGS \
+      $WARNING_CFLAGS_JVM $JVM_PICFLAG $FILE_MACRO_CFLAGS \
       $REPRODUCIBLE_CFLAGS $BRANCH_PROTECTION_CFLAGS"
 
   CFLAGS_JDK_COMMON="$ALWAYS_DEFINES_JDK $TOOLCHAIN_CFLAGS_JDK \
       $OS_CFLAGS $CFLAGS_OS_DEF_JDK $DEBUG_CFLAGS_JDK $DEBUG_OPTIONS_FLAGS_JDK \
-      $WARNING_CFLAGS $WARNING_CFLAGS_JDK $DEBUG_SYMBOLS_CFLAGS_JDK \
+      $DEBUG_SYMBOLS_CFLAGS_JDK \
       $FILE_MACRO_CFLAGS $REPRODUCIBLE_CFLAGS $BRANCH_PROTECTION_CFLAGS"
 
   # Use ${$2EXTRA_CFLAGS} to block EXTRA_CFLAGS to be added to build flags.

diff --git a/make/autoconf/lib-tests.m4 b/make/autoconf/lib-tests.m4
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -28,7 +28,7 @@
 ################################################################################
 
 # Minimum supported versions
-JTREG_MINIMUM_VERSION=8.1
+JTREG_MINIMUM_VERSION=8.2.1
 GTEST_MINIMUM_VERSION=1.14.0
 
 ################################################################################

diff --git a/make/conf/github-actions.conf b/make/conf/github-actions.conf
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2020, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2020, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -26,7 +26,7 @@
 # Versions and download locations for dependencies used by GitHub Actions (GHA)
 
 GTEST_VERSION=1.14.0
-JTREG_VERSION=8.1+1
+JTREG_VERSION=8.2.1+1
 
 LINUX_X64_BOOT_JDK_EXT=tar.gz
 LINUX_X64_BOOT_JDK_URL=https://download.java.net/java/GA/jdk25/bd75d5f9689641da8e1daabeccb5528b/36/GPL/openjdk-25_linux-x64_bin.tar.gz

diff --git a/make/conf/jib-profiles.js b/make/conf/jib-profiles.js
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2025, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2026, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -1174,9 +1174,9 @@ var getJibProfilesDependencies = function (input, common) {
         jtreg: {
             server: "jpg",
             product: "jtreg",
-            version: "8.1",
+            version: "8.2.1",
             build_number: "1",
-            file: "bundles/jtreg-8.1+1.zip",
+            file: "bundles/jtreg-8.2.1+1.zip",
             environment_name: "JT_HOME",
             environment_path: input.get("jtreg", "home_path") + "/bin",
             configure_args: "--with-jtreg=" + input.get("jtreg", "home_path"),

diff --git a/make/jdk/src/classes/build/tools/cldrconverter/CLDRConverter.java b/make/jdk/src/classes/build/tools/cldrconverter/CLDRConverter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2026, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -293,8 +293,10 @@ public static void main(String[] args) throws Exception {
         bundleGenerator = new ResourceBundleGenerator();
 
         // Parse data independent of locales
-        parseSupplemental();
+        // parseBCP47() must precede parseSupplemental(). The latter depends
+        // on IANA alias map, which is produced by the former.
         parseBCP47();
+        parseSupplemental();
 
         // rules maps
         pluralRules = generateRules(handlerPlurals);
@@ -536,6 +538,12 @@ private static void parseBCP47() throws Exception {
 
         // canonical tz name map
         // alias -> primary
+        //
+        // Note that CLDR meta zones do not necessarily align with IANA's
+        // current time zone identifiers. For example, the CLDR "India"
+        // meta zone maps to "Asia/Calcutta", whereas IANA now uses
+        // "Asia/Kolkata" for the zone. Accordingly, "canonical" here is
+        // defined in terms of CLDR's zone mappings.
         handlerTimeZone.getData().forEach((k, v) -> {
             String[] ids = ((String)v).split("\\s");
             for (int i = 1; i < ids.length; i++) {

diff --git a/make/jdk/src/classes/build/tools/cldrconverter/TimeZoneParseHandler.java b/make/jdk/src/classes/build/tools/cldrconverter/TimeZoneParseHandler.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2017, 2026, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -27,6 +27,9 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
 
 import org.xml.sax.Attributes;
 import org.xml.sax.InputSource;
@@ -40,6 +43,10 @@
 class TimeZoneParseHandler extends AbstractLDMLHandler<Object> {
     private static final String PREF_PREFIX = "preferred:";
 
+    // CLDR aliases to IANA ids map. The initial capacity is estimated
+    // from the number of aliases in timezone.xml as of CLDR v48
+    private final Map<String, String> ianaAliasMap = HashMap.newHashMap(32);
+
     @Override
     public InputSource resolveEntity(String publicID, String systemID) throws IOException, SAXException {
         // avoid HTTP traffic to unicode.org
@@ -61,7 +68,16 @@ public void startElement(String uri, String localName, String qName, Attributes
                         put(attributes.getValue("name"), PREF_PREFIX + preferred);
                     }
                 } else {
-                    put(attributes.getValue("name"), attributes.getValue("alias"));
+                    var alias = attributes.getValue("alias");
+                    var iana = attributes.getValue("iana");
+                    if (iana != null) {
+                        for (var a : alias.split("\\s+")) {
+                            if (!a.equals(iana)) {
+                                ianaAliasMap.put(a, iana);
+                            }
+                        }
+                    }
+                    put(attributes.getValue("name"), alias);
                 }
             }
             break;
@@ -80,4 +96,8 @@ public void endDocument() throws SAXException {
             .forEach(e -> map.put(e.getKey(),
                 map.get(e.getValue().toString().substring(PREF_PREFIX.length()))));
     }
+
+    Map<String, String> getIanaAliasMap() {
+        return ianaAliasMap;
+    }
 }
diff --git a/make/jdk/src/classes/build/tools/cldrconverter/WinZonesParseHandler.java b/make/jdk/src/classes/build/tools/cldrconverter/WinZonesParseHandler.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -56,6 +56,7 @@ public void startElement(String uri, String localName, String qName, Attributes
             String zoneName = attributes.getValue("other");
             String territory = attributes.getValue("territory");
             String javatz = attributes.getValue("type").replaceFirst("\\s.*", "");
+            javatz = CLDRConverter.handlerTimeZone.getIanaAliasMap().getOrDefault(javatz, javatz);
             put(zoneName + ":" + territory, javatz);
             pushIgnoredContainer(qName);
             break;

diff --git a/make/modules/jdk.jpackage/Lib.gmk b/make/modules/jdk.jpackage/Lib.gmk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2018, 2025, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2018, 2026, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -54,7 +54,7 @@ $(eval $(call SetupJdkExecutable, BUILD_JPACKAGEAPPLAUNCHER, \
     SRC := applauncher, \
     EXTRA_SRC := common, \
     INCLUDE_FILES := $(JPACKAGEAPPLAUNCHER_INCLUDE_FILES), \
-    OPTIMIZATION := LOW, \
+    OPTIMIZATION := SIZE, \
     DISABLED_WARNINGS_clang_JvmLauncherLib.c := format-nonliteral, \
     DISABLED_WARNINGS_clang_LinuxPackage.c := format-nonliteral, \
     DISABLED_WARNINGS_clang_Log.cpp := unused-const-variable, \
@@ -91,7 +91,7 @@ ifeq ($(call isTargetOs, linux), true)
           common, \
       EXCLUDE_FILES := LinuxLauncher.c LinuxPackage.c, \
       LINK_TYPE := C++, \
-      OPTIMIZATION := LOW, \
+      OPTIMIZATION := SIZE, \
       DISABLED_WARNINGS_gcc_Log.cpp := unused-const-variable, \
       DISABLED_WARNINGS_clang_JvmLauncherLib.c := format-nonliteral, \
       DISABLED_WARNINGS_clang_tstrings.cpp := format-nonliteral, \