export CERN=$(shell pwd)
ifdef CERNLIB_VERSION
export CERN_LEVEL=$(CERNLIB_VERSION)
else
export CERN_LEVEL=2006
endif
export CERN_ROOT=$(CERN)/$(CERN_LEVEL)
export CVSCOSRC=$(CERN_ROOT)/src
export PATH:=$(CERN_ROOT)/bin:$(PATH)

WHICH_GFORTRAN = $(shell which gfortran)
ifneq (,$(findstring gfortran,$(WHICH_GFORTRAN)))
      FC=gfortran
      PATCH_PACKLIB = $(shell $(BUILD_SCRIPTS)/patches/cernlib/packlib_patch.pl)
else
      FC=g77
      PATCH_PACKLIB = false
endif

UBUNTU_MARKER := $(shell ls /etc/lsb-release)

all: info make_cernlib make_links final_patches

info:
	@echo FC = $(FC)
	@echo PATCH_PACKLIB = $(PATCH_PACKLIB)
	@echo WHICH_GFORTRAN = $(WHICH_GFORTRAN)

$(CERN_ROOT)/.untar_src_done: $(CERN_LEVEL)_src.tar.gz
	tar zxf $<
	date > $@

$(CERN_ROOT)/.untar_include_done: include.tar.gz
	tar zxf $<
	date > $@

make_cernlib: $(CERN_ROOT)/build/scripts/install.bin
	$(MAKE) -C$(CERN_ROOT)/build FC=$(FC)

$(CERN_ROOT)/build/scripts/Makefile:
	$(MAKE) -C$(CERN_ROOT)/build scripts/Makefile

make_links:
ifneq ($(UBUNTU_MARKER),/etc/lsb-release)
	cd $(CERN_ROOT)/lib ; test -L libblas.a || ln -s /usr/lib/libblas.a libblas.a
	cd $(CERN_ROOT)/lib ; test -L liblapack3.a || ln -s /usr/lib/liblapack.a liblapack3.a
else
	cd $(CERN_ROOT)/lib ; test -L libblas.a || ln -s /usr/lib/atlas-base/atlas/libblas.a libblas.a
	cd $(CERN_ROOT)/lib ; test -L liblapack3.a || ln -s /usr/lib/atlas-base/atlas/liblapack.a liblapack3.a
endif

%.tar.gz:
	wget http://cernlib.web.cern.ch/cernlib/download/${CERN_LEVEL}_source/tar/$@

$(CERN_ROOT)/cernlib_patch_file.txt:
	cat $(BUILD_SCRIPTS)/patches/cernlib/*.txt > $@

$(CERN_ROOT)/.patch_done: $(CERN_ROOT)/.untar_src_done $(CERN_ROOT)/.untar_include_done $(CERN_ROOT)/cernlib_patch_file.txt
	cd $(CERN_ROOT); patch -p1 < $(CERN_ROOT)/cernlib_patch_file.txt
	date > $@

$(CERN_ROOT)/.dirs_done:
	cd $(CERN_ROOT); mkdir -p build bin lib
	date > $@

$(CERN_ROOT)/.imake_boot_done: $(CERN_ROOT)/.patch_done $(CERN_ROOT)/.dirs_done
	cd $(CERN_ROOT)/build; $(CVSCOSRC)/config/imake_boot
	date > $@

$(CERN_ROOT)/bin/kuipc: $(CERN_ROOT)/.imake_boot_done
	$(MAKE) -C$(CERN_ROOT)/build bin/kuipc

$(CERN_ROOT)/scripts/Makefile: $(CERN_ROOT)/bin/kuipc
	$(MAKE) -C$(CERN_ROOT)/build scripts/Makefile

$(CERN_ROOT)/build/scripts/install.bin: $(CERN_ROOT)/scripts/Makefile
	$(MAKE) -C$(CERN_ROOT)/build/scripts install.bin

final_patches: $(CERN_ROOT)/.packlib_patch_done

$(CERN_ROOT)/.packlib_patch_done:
	gcc -c $(BUILD_SCRIPTS)/patches/cernlib/lshift.c
	ar rv $(CERN_ROOT)/lib/libpacklib.a lshift.o
	date > $@