ICU 56 update step 1

source/tools/gencolusb/Makefile

+## Makefile for rebuilding 'unsafe backward' data
+## Copyright (c) 2015, International Business Machines Corporation and
+## others. All Rights Reserved.
+
+##
+## CONFIGURATION:
+## 1. create Makefile.local containing overrides if necessary:
+##    BUILD_ROOT=/home/user/icu-build    (location of 'config.status' etc.)
+##    PATH_VAR=DYLD_LIBRARY_PATH         (if on OSX etc)
+##
+## UPDATING
+## 1.  make 'reset-icu' will reset ICU to 'bootstrap' state, zeroing out source/i18n/collunsafe.h
+## 2.  make 'gen-file'  will generate and test source/i18n/collunsafe.h
+
+subdir=tools/gencolusb
+srcdir=$(shell pwd)
+SOURCE_ROOT=$(shell cd ../.. ; pwd)
+BUILD_ROOT=$(SOURCE_ROOT)
+BUILD_HERE=$(BUILD_ROOT)/$(subdir)
+TOOL=extract_unsafe_backwards
+TEST=verify_uset
+PATH_VAR=LD_LIBRARY_PATH
+
+-include Makefile.local
+
+GEN_FILE=$(SOURCE_ROOT)/i18n/collunsafe.h
+BUILD_OPTS=-I$(SOURCE_ROOT)/common -I$(SOURCE_ROOT)/i18n -L$(BUILD_ROOT)/lib -licuuc -licui18n -licudata
+RUN_OPTS=env $(PATH_VAR)=$(BUILD_ROOT)/lib
+
+reset-icu:
+        >$(GEN_FILE)
+        $(MAKE) -C $(BUILD_ROOT)/i18n
+
+gen-file: reset-icu
+        mkdir -p $(BUILD_HERE)
+        $(CXX) -o $(BUILD_HERE)/$(TOOL) $(srcdir)/$(TOOL).cpp  $(BUILD_OPTS)
+        $(RUN_OPTS) $(BUILD_HERE)/$(TOOL) > $(GEN_FILE) || exit 1
+        $(CXX) -o $(BUILD_HERE)/$(TEST) $(srcdir)/$(TEST).cpp $(BUILD_OPTS)
+        $(RUN_OPTS) $(BUILD_HERE)/$(TEST) || exit 1
+        $(MAKE) -C $(BUILD_ROOT)/i18n
+        $(RUN_OPTS) $(BUILD_HERE)/$(TEST) || exit 1
+
+.PHONY: reset-icu gen-file