8339783: Implement JEP 479: Remove the Windows 32-bit x86 Port

make/autoconf/platform.m4

@@ -659,6 +659,21 @@ AC_DEFUN_ONCE([PLATFORM_SETUP_OPENJDK_BUILD_AND_TARGET],
   PLATFORM_SET_MODULE_TARGET_OS_VALUES
   PLATFORM_SET_RELEASE_FILE_OS_VALUES
   PLATFORM_SETUP_LEGACY_VARS
+  PLATFORM_CHECK_DEPRECATION
+])
+
+AC_DEFUN([PLATFORM_CHECK_DEPRECATION],
+[
+  AC_ARG_ENABLE(deprecated-ports, [AS_HELP_STRING([--enable-deprecated-ports@<:@=yes/no@:>@],
+      [Suppress the error when configuring for a deprecated port @<:@no@:>@])])
+  # if test "x$OPENJDK_TARGET_CPU" = xx86; then
+  #   if test "x$enable_deprecated_ports" = "xyes"; then
+  #     AC_MSG_WARN([The x86 port is deprecated and may be removed in a future release.])
+  #   else
+  #     AC_MSG_ERROR(m4_normalize([The 32-bit x86 port is deprecated and may be removed in a future release.
+  #       Use --enable-deprecated-ports=yes to suppress this error.]))
+  #   fi
+  # fi
 ])
 
 AC_DEFUN_ONCE([PLATFORM_SETUP_OPENJDK_BUILD_OS_VERSION],

src/hotspot/os/windows/os_windows.cpp

@@ -133,7 +133,7 @@ static FILETIME process_kernel_time;
 #elif defined(_M_AMD64)
   #define __CPU__ amd64
 #else
-  #define __CPU__ unknown
+  #error "Unknown CPU"
 #endif
 
 #if defined(USE_VECTORED_EXCEPTION_HANDLING)