--- old/common/autoconf/bootcycle-spec.gmk.in	2014-10-03 12:10:53.217479942 +0200
+++ new/common/autoconf/bootcycle-spec.gmk.in	2014-10-03 12:10:53.121475993 +0200
@@ -48,6 +48,13 @@
 # Use a different Boot JDK
 OLD_BOOT_JDK:=$(BOOT_JDK)
 BOOT_JDK:=@BUILD_OUTPUT@/images/j2sdk-image
-BOOT_RTJAR:=@BUILD_OUTPUT@/images/j2sdk-image/jre/lib/rt.jar
+BOOT_RTJAR:=$(BOOT_JDK)/jre/lib/rt.jar
+
+JAVA_CMD:=$(BOOT_JDK)/bin/java
+JAVAC_CMD:=$(BOOT_JDK)/bin/javac
+JAVAH_CMD:=$(BOOT_JDK)/bin/javah
+JAR_CMD:=$(BOOT_JDK)/bin/jar
+NATIVE2ASCII_CMD:=$(BOOT_JDK)/bin/native2ascii
+JARSIGNER_CMD:=$(BOOT_JDK)/bin/jarsigner
+SJAVAC_SERVER_JAVA_CMD:=$(JAVA_CMD)
 
-SJAVAC_SERVER_JAVA:=$(subst $(OLD_BOOT_JDK),$(BOOT_JDK),$(SJAVAC_SERVER_JAVA))
--- old/common/autoconf/build-performance.m4	2014-10-03 12:10:53.649497712 +0200
+++ new/common/autoconf/build-performance.m4	2014-10-03 12:10:53.541493270 +0200
@@ -296,7 +296,7 @@
   AC_SUBST(SJAVAC_SERVER_JAVA)
 
   if test "$MEMORY_SIZE" -gt "3000"; then
-    ADD_JVM_ARG_IF_OK([-d64],SJAVAC_SERVER_JAVA,[$SJAVAC_SERVER_JAVA])
+    ADD_JVM_ARG_IF_OK([-d64],SJAVAC_SERVER_JAVA_FLAGS,[$SJAVAC_SERVER_JAVA])
     if test "$JVM_ARG_OK" = true; then
       JVM_64BIT=true
       JVM_ARG_OK=false
@@ -320,7 +320,8 @@
   if test "$MX_VALUE" -lt "512"; then
     MX_VALUE=512
   fi
-  ADD_JVM_ARG_IF_OK([-Xms${MS_VALUE}M -Xmx${MX_VALUE}M],SJAVAC_SERVER_JAVA,[$SJAVAC_SERVER_JAVA])
+  ADD_JVM_ARG_IF_OK([-Xms${MS_VALUE}M -Xmx${MX_VALUE}M],SJAVAC_SERVER_JAVA_FLAGS,[$SJAVAC_SERVER_JAVA])
+  AC_SUBST(SJAVAC_SERVER_JAVA_FLAGS)
 
   AC_ARG_ENABLE([sjavac], [AS_HELP_STRING([--enable-sjavac],
       [use sjavac to do fast incremental compiles @<:@disabled@:>@])],
--- old/common/autoconf/generated-configure.sh	2014-10-03 12:10:54.149518281 +0200
+++ new/common/autoconf/generated-configure.sh	2014-10-03 12:10:53.989511700 +0200
@@ -633,6 +633,7 @@
 USE_PRECOMPILED_HEADER
 SJAVAC_SERVER_DIR
 ENABLE_SJAVAC
+SJAVAC_SERVER_JAVA_FLAGS
 SJAVAC_SERVER_JAVA
 JAVA_TOOL_FLAGS_SMALL
 JAVA_FLAGS_SMALL
@@ -4327,7 +4328,7 @@
 #CUSTOM_AUTOCONF_INCLUDE
 
 # Do not change or remove the following line, it is needed for consistency checks:
-DATE_WHEN_GENERATED=1410791401
+DATE_WHEN_GENERATED=1412329015
 
 ###############################################################################
 #
@@ -50472,7 +50473,7 @@
   FOUND_WARN=`$ECHO "$OUTPUT" | grep -i warn`
   FOUND_VERSION=`$ECHO $OUTPUT | grep " version \""`
   if test "x$FOUND_VERSION" != x && test "x$FOUND_WARN" = x; then
-    SJAVAC_SERVER_JAVA="$SJAVAC_SERVER_JAVA -d64"
+    SJAVAC_SERVER_JAVA_FLAGS="$SJAVAC_SERVER_JAVA_FLAGS -d64"
     JVM_ARG_OK=true
   else
     $ECHO "Arg failed:" >&5
@@ -50510,7 +50511,7 @@
   FOUND_WARN=`$ECHO "$OUTPUT" | grep -i warn`
   FOUND_VERSION=`$ECHO $OUTPUT | grep " version \""`
   if test "x$FOUND_VERSION" != x && test "x$FOUND_WARN" = x; then
-    SJAVAC_SERVER_JAVA="$SJAVAC_SERVER_JAVA -Xms${MS_VALUE}M -Xmx${MX_VALUE}M"
+    SJAVAC_SERVER_JAVA_FLAGS="$SJAVAC_SERVER_JAVA_FLAGS -Xms${MS_VALUE}M -Xmx${MX_VALUE}M"
     JVM_ARG_OK=true
   else
     $ECHO "Arg failed:" >&5
@@ -50519,6 +50520,7 @@
   fi
 
 
+
   # Check whether --enable-sjavac was given.
 if test "${enable_sjavac+set}" = set; then :
   enableval=$enable_sjavac; ENABLE_SJAVAC="${enableval}"
--- old/common/autoconf/spec.gmk.in	2014-10-03 12:10:55.281564848 +0200
+++ new/common/autoconf/spec.gmk.in	2014-10-03 12:10:55.165560077 +0200
@@ -256,7 +256,8 @@
 
 BUILD_HOTSPOT=@BUILD_HOTSPOT@
 
-# The boot jdk to use
+# The boot jdk to use. These are overridden in bootcycle-spec.gmk. Make sure to keep
+# them in sync.
 BOOT_JDK:=@BOOT_JDK@
 BOOT_RTJAR:=@BOOT_RTJAR@
 BOOT_TOOLSJAR=$(BOOT_JDK)/lib/tools.jar
@@ -453,23 +454,35 @@
 JAVA_FLAGS_BIG:=@JAVA_FLAGS_BIG@
 JAVA_FLAGS_SMALL:=@JAVA_FLAGS_SMALL@
 JAVA_TOOL_FLAGS_SMALL:=@JAVA_TOOL_FLAGS_SMALL@
+SJAVAC_SERVER_JAVA_FLAGS:=@SJAVAC_SERVER_JAVA_FLAGS@
 
-JAVA=@FIXPATH@ @JAVA@ $(JAVA_FLAGS_BIG) $(JAVA_FLAGS)
-JAVA_SMALL=@FIXPATH@ @JAVA@ $(JAVA_FLAGS_SMALL) $(JAVA_FLAGS)
+# The *_CMD variables are defined separately to be easily overridden in bootcycle-spec.gmk 
+# for bootcycle-images build. Make sure to keep them in sync. Do not use the *_CMD
+# versions of the variables directly.
+JAVA_CMD:=@JAVA@
+JAVAC_CMD:=@JAVAC@
+JAVAH_CMD:=@JAVAH@
+JAR_CMD:=@JAR@
+NATIVE2ASCII_CMD:=@NATIVE2ASCII@
+JARSIGNER_CMD:=@JARSIGNER@
+SJAVAC_SERVER_JAVA_CMD:=@SJAVAC_SERVER_JAVA@
+# These variables are meant to be used. They are defined with = instead of := to make
+# it possible to override only the *_CMD variables.
+JAVA=@FIXPATH@ $(JAVA_CMD) $(JAVA_FLAGS_BIG) $(JAVA_FLAGS)
+JAVA_SMALL=@FIXPATH@ $(JAVA_CMD) $(JAVA_FLAGS_SMALL) $(JAVA_FLAGS)
+JAVAC=@FIXPATH@ $(JAVAC_CMD)
+JAVAH=@FIXPATH@ $(JAVAH_CMD)
+JAR=@FIXPATH@ $(JAR_CMD)
+NATIVE2ASCII=@FIXPATH@ $(NATIVE2ASCII_CMD) $(JAVA_TOOL_FLAGS_SMALL)
+JARSIGNER=@FIXPATH@ $(JARSIGNER_CMD)
+# A specific java binary with specific options can be used to run
+# the long running background sjavac servers and other long running tasks.
+SJAVAC_SERVER_JAVA=@FIXPATH@ $(SJAVAC_SERVER_JAVA_CMD) $(SJAVAC_SERVER_JAVA_FLAGS)
 
-JAVAC:=@FIXPATH@ @JAVAC@
 # Hotspot sets this variable before reading the SPEC when compiling sa-jdi.jar. Avoid
 # overriding that value by using ?=.
 JAVAC_FLAGS?=@JAVAC_FLAGS@
 
-JAVAH:=@FIXPATH@ @JAVAH@
-
-JAR:=@FIXPATH@ @JAR@
-
-NATIVE2ASCII:=@FIXPATH@ @NATIVE2ASCII@ $(JAVA_TOOL_FLAGS_SMALL)
-
-JARSIGNER:=@FIXPATH@ @JARSIGNER@
-
 # You run the new javac using the boot jdk with $(BOOT_JDK)/bin/java $(NEW_JAVAC) ...
 INTERIM_LANGTOOLS_JAR := $(LANGTOOLS_OUTPUTDIR)/dist/interim_langtools.jar
 INTERIM_LANGTOOLS_ARGS := "-Xbootclasspath/p:$(INTERIM_LANGTOOLS_JAR)" -cp $(INTERIM_LANGTOOLS_JAR)
@@ -486,10 +499,6 @@
   RC_FLAGS:=@RC_FLAGS@
 endif
 
-# A specific java binary with specific options can be used to run
-# the long running background sjavac servers and other long running tasks.
-SJAVAC_SERVER_JAVA:=@FIXPATH@ @SJAVAC_SERVER_JAVA@
-
 # Tools adhering to a minimal and common standard of posix compliance.
 AWK:=@AWK@
 BASENAME:=@BASENAME@