8002028: build-infra: need no-hotspot partial build

Summary: Added configure option --with-import-hotspot=/path/to/j2sdkimage
Reviewed-by: dholmes, tbell
Contributed-by: erik.joelsson@oracle.com

common/autoconf/source-dirs.m4

@@ -253,5 +253,24 @@ AC_DEFUN_ONCE([SRCDIRS_SETUP_OUTPUT_DIRS],
 BUILD_OUTPUT="$OUTPUT_ROOT"
 AC_SUBST(BUILD_OUTPUT)
 
+HOTSPOT_DIST="$OUTPUT_ROOT/hotspot/dist"
+BUILD_HOTSPOT=true
+AC_SUBST(HOTSPOT_DIST)
+AC_SUBST(BUILD_HOTSPOT)
+AC_ARG_WITH(import-hotspot, [AS_HELP_STRING([--with-import-hotspot],
+	[import hotspot binaries from this jdk image or hotspot build dist dir instead of building from source])])
+if test "x$with_import_hotspot" != x; then
+    CURDIR="$PWD"
+    cd "$with_import_hotspot"
+    HOTSPOT_DIST="`pwd`"
+    cd "$CURDIR"
+    if ! (test -d $HOTSPOT_DIST/lib && test -d $HOTSPOT_DIST/jre/lib); then
+        AC_MSG_ERROR([You have to import hotspot from a full jdk image or hotspot build dist dir!])
+    fi
+    AC_MSG_CHECKING([if hotspot should be imported])
+    AC_MSG_RESULT([yes from $HOTSPOT_DIST])
+    BUILD_HOTSPOT=false
+fi
+
 JDK_OUTPUTDIR="$OUTPUT_ROOT/jdk"
 ])

common/autoconf/spec.gmk.in

@@ -224,7 +224,9 @@ LANGTOOLS_DIST=$(LANGTOOLS_OUTPUTDIR)/dist
 CORBA_DIST=$(CORBA_OUTPUTDIR)/dist
 JAXP_DIST=$(JAXP_OUTPUTDIR)/dist
 JAXWS_DIST=$(JAXWS_OUTPUTDIR)/dist
-HOTSPOT_DIST=$(HOTSPOT_OUTPUTDIR)/dist
+HOTSPOT_DIST=@HOTSPOT_DIST@
+
+BUILD_HOTSPOT=@BUILD_HOTSPOT@
 
 # The boot jdk to use
 BOOT_JDK:=@BOOT_JDK@

common/makefiles/Main.gmk

@@ -94,11 +94,13 @@ jaxws-only: start-make
 	@($(CD) $(JAXWS_TOPDIR)/makefiles && $(BUILD_LOG_WRAPPER) $(MAKE) $(MAKE_ARGS) -f BuildJaxws.gmk)
 	@$(call TargetExit)
 
+ifeq ($(BUILD_HOTSPOT),true)
 hotspot: hotspot-only
 hotspot-only: start-make
 	@$(call TargetEnter)
 	@($(CD) $(SRC_ROOT)/common/makefiles && $(BUILD_LOG_WRAPPER) $(MAKE) $(MAKE_ARGS) -f HotspotWrapper.gmk)
 	@$(call TargetExit)
+endif
 
 jdk: langtools hotspot corba jaxp jaxws jdk-only
 jdk-only: start-make