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--- openjdk.orig/common/autoconf/boot-jdk.m4	2016-01-21 18:33:47.586288044 +0000
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+++ openjdk/common/autoconf/boot-jdk.m4	2016-02-05 15:56:09.012242707 +0000
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@@ -1,5 +1,6 @@
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 #
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 # Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
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+# Copyright 2014 Red Hat, Inc.
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 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 #
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 # This code is free software; you can redistribute it and/or modify it
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@@ -303,6 +323,9 @@
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 AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK_ARGUMENTS],
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 [
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+  # Ensure OPENJDK_TARGET_CPU_ARCH has been setup
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+  AC_REQUIRE([PLATFORM_SETUP_OPENJDK_BUILD_AND_TARGET])
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+
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   ##############################################################################
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   #
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   # Specify options for anything that is run with the Boot JDK.
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@@ -325,16 +348,23 @@
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   JAVA_FLAGS=$boot_jdk_jvmargs
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   AC_SUBST(JAVA_FLAGS)
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-
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   AC_MSG_CHECKING([flags for boot jdk java command for big workloads])
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   # Starting amount of heap memory.
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-  ADD_JVM_ARG_IF_OK([-Xms64M],boot_jdk_jvmargs_big,[$JAVA])
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+  if test "x$OPENJDK_BUILD_CPU_ARCH" = "xs390"; then
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+    ADD_JVM_ARG_IF_OK([-Xms256M],boot_jdk_jvmargs_big,[$JAVA])
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+  else
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+    ADD_JVM_ARG_IF_OK([-Xms64M],boot_jdk_jvmargs_big,[$JAVA])
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+  fi
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   # Maximum amount of heap memory.
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   # Maximum stack size.
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   if test "x$BOOT_JDK_BITS" = x32; then
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-    JVM_MAX_HEAP=1100M
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+    if test "x$OPENJDK_BUILD_CPU_ARCH" = "xs390"; then
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+      JVM_MAX_HEAP=768M
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+    else
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+      JVM_MAX_HEAP=1100M
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+    fi
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     STACK_SIZE=768
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   else
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     # Running Javac on a JVM on a 64-bit machine, takes more space since 64-bit