#!/usr/bin/make -f

# Some ATLAS code uses improper format strings, so disable this
export DEB_BUILD_MAINT_OPTIONS=hardening=-format

include /usr/share/dpkg/default.mk

# Parallel make variable, used by ATLAS build system
PMAKE := make
ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
PMAKE += -j $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
endif

GFORTRAN_LIB_PATH := $(shell $(CC) -print-search-dirs | grep ^install: | awk '{print $$2}')

# Flags common to both the generic and custom packages
CONFIGURE_FLAGS := --prefix="$(CURDIR)/debian/tmp"			 	\
	--incdir="$(CURDIR)/debian/tmp/usr/include/$(DEB_HOST_MULTIARCH)/"	\
	--libdir="$(CURDIR)/debian/tmp/usr/lib/$(DEB_HOST_MULTIARCH)/"		\
	--shared								\
	-D c -DWALL 								\
	-Ss f77lib "-L$(GFORTRAN_LIB_PATH) -lgfortran -lgcc_s -lpthread"	\
	-Ss pmake '$(PMAKE)'							\
	-v 2

ifeq (,$(filter custom,$(DEB_BUILD_OPTIONS)))
# Building the generic package, so enforce more configuration settings to make
# the package independent of the build host hardware.

# In particular, force the MACHTYPE and ISA.
# The following strings and numbers come from xprint_enums (compilable
# with "make -C build xprint_enums").
# N.B.: They can change across releases!

ifeq (yes,$(shell dpkg-vendor --derives-from Ubuntu && echo yes))
UBUNTU := yes
endif

# Select the machine type
ifeq ($(DEB_HOST_ARCH),s390x)
MACHTYPE := $(if $(UBUNTU),IBMz12,IBMz9)
else ifeq ($(DEB_HOST_ARCH_CPU),ppc64el)
MACHTYPE := POWER8
else ifeq ($(DEB_HOST_ARCH_CPU),i386)
# See http://math-atlas.sourceforge.net/atlas_install/node32.html
MACHTYPE := x86x87
else ifeq ($(DEB_HOST_ARCH_CPU),amd64)
MACHTYPE := x86SSE2
else ifeq ($(DEB_HOST_ARCH),ia64)
MACHTYPE := IA64Itan
else
# The same as UNKNOWN, except that it does not try autodetection
# See debian/patches/generic.diff
MACHTYPE := GENERIC
endif

# ISA corresponds to the instruction set architecture:
# - 1 means no instruction set extension
# - 768 means SSE1+SSE2 (always available on amd64)
# - 16384 means FPV3D16MAC (always available on armhf)
# VSX should also be enabled on ppc64el, but as of 3.10.3-2 it FTBFS.
ifeq ($(DEB_HOST_ARCH_CPU),amd64)
ISA := 768
else ifeq ($(DEB_HOST_ARCH),armhf)
ISA := 16384
else
ISA := 1
endif

# - the cripple-atlas-performance flag is needed for disabling the CPU
#   throttling check, because on some buildds CPU throttling is enabled and we
#   have no way of disabling it;
# - disable multi-threading (-t 0), because otherwise the package FTBFS on some
#   single-processor machines;
# - enforce gcc as the compiler for all uses (except for compiling probes,
#   in --cc), because otherwise architectural defaults do not work.
CONFIGURE_FLAGS +=	 					\
	-b $(DEB_HOST_ARCH_BITS)				\
	-A $(MACHTYPE) 						\
	-V $(ISA) 						\
	-t 0 							\
	--cc="$(CC)" 						\
	--cflags="$(CPPFLAGS) $(CFLAGS)"			\
	-C acg gcc						\
	-F acg "$(CPPFLAGS) $(CFLAGS)"				\
	-C if gfortran						\
	-F if "$(FFLAGS)"					\
	-Ss ADdir ../../debian/archdefs/$(DEB_HOST_ARCH_CPU)	\
	--cripple-atlas-performance

else
# Flags specific to the custom package

# Uncomment the following if the ATLAS build system still complains after you
# have set all the CPU governors to "performance"
#CONFIGURE_FLAGS += --cripple-atlas-performance
endif


GENERATED_DEBIAN_FILES := $(patsubst %.in,%,$(wildcard debian/*.pc.in debian/*.postinst.in debian/*.prerm.in))

$(GENERATED_DEBIAN_FILES): %: %.in
	sed -e "s/@DEB_VERSION_UPSTREAM@/$(DEB_VERSION_UPSTREAM)/g" \
	    -e "s/@DEB_HOST_MULTIARCH@/$(DEB_HOST_MULTIARCH)/g" < $< > $@


%:
	dh $@

override_dh_auto_configure-arch: $(GENERATED_DEBIAN_FILES)
	mkdir -p build/
	cd build && ../configure $(CONFIGURE_FLAGS)
	@echo "=============================================="
	@echo -n "Configured arch: "
	@grep ARCH < build/Make.inc | head -1 | awk '{print $$3}'
	@echo "=============================================="

override_dh_auto_configure-indep:

override_dh_auto_build-arch:
	make -C build

	# We do not ship the lib{s,t}atlas.so created by ATLAS build system, they have an awkward name and an incorrect SONAME
	# Rather create our shared versions of individual ATLAS libraries
	gfortran $(LDFLAGS) -shared -Wl,-soname=libatlas.so.3 -o libatlas.so.$(DEB_VERSION_UPSTREAM) \
		-Wl,--whole-archive build/lib/libatlas.a -Wl,--no-whole-archive \
		$$(test -f build/lib/libptcblas.a && echo -lpthread) -lc -lm
	ln -sf libatlas.so.$(DEB_VERSION_UPSTREAM) libatlas.so.3
	ln -sf libatlas.so.$(DEB_VERSION_UPSTREAM) libatlas.so

	gfortran $(LDFLAGS) -shared -Wl,-soname=libcblas.so.3 -o libcblas.so.$(DEB_VERSION_UPSTREAM) \
		-Wl,--whole-archive build/lib/libcblas.a -Wl,--no-whole-archive \
		-L. -latlas -lm -lc
	ln -sf libcblas.so.$(DEB_VERSION_UPSTREAM) libcblas.so.3
	ln -sf libcblas.so.$(DEB_VERSION_UPSTREAM) libcblas.so

	gfortran $(LDFLAGS) -shared -Wl,-soname=libf77blas.so.3 -o libf77blas.so.$(DEB_VERSION_UPSTREAM) \
		-Wl,--whole-archive build/lib/libf77blas.a -Wl,--no-whole-archive \
		-L. -lcblas -latlas -lm -lc
	ln -sf libf77blas.so.$(DEB_VERSION_UPSTREAM) libf77blas.so.3
	ln -sf libf77blas.so.$(DEB_VERSION_UPSTREAM) libf77blas.so

	gfortran $(LDFLAGS) -shared -Wl,-soname=liblapack_atlas.so.3 -o liblapack_atlas.so.$(DEB_VERSION_UPSTREAM) \
		-Wl,--whole-archive build/lib/liblapack_atlas.a -Wl,--no-whole-archive \
		-L. -lf77blas -lcblas -latlas -lm -lc
	ln -sf liblapack_atlas.so.$(DEB_VERSION_UPSTREAM) liblapack_atlas.so.3
	ln -sf liblapack_atlas.so.$(DEB_VERSION_UPSTREAM) liblapack_atlas.so

	if test -f build/lib/libptcblas.a; then \
		gfortran $(LDFLAGS) -shared -Wl,-soname=libptcblas.so.3 \
			-o libptcblas.so.$(DEB_VERSION_UPSTREAM) \
			-Wl,--whole-archive build/lib/libptcblas.a -Wl,--no-whole-archive \
			-L. -latlas -lm -lc; \
		ln -sf libptcblas.so.$(DEB_VERSION_UPSTREAM) libptcblas.so.3; \
		ln -sf libptcblas.so.$(DEB_VERSION_UPSTREAM) libptcblas.so; \
	fi

	if test -f build/lib/libptf77blas.a; then \
		gfortran $(LDFLAGS) -shared -Wl,-soname=libptf77blas.so.3 \
			-o libptf77blas.so.$(DEB_VERSION_UPSTREAM) \
			-Wl,--whole-archive build/lib/libptf77blas.a -Wl,--no-whole-archive \
			-L. -lptcblas -latlas -lm -lc; \
		ln -sf libptf77blas.so.$(DEB_VERSION_UPSTREAM) libptf77blas.so.3; \
		ln -sf libptf77blas.so.$(DEB_VERSION_UPSTREAM) libptf77blas.so; \
	fi

	# Create static and shared full BLAS
	mkdir tmp
	cd tmp && \
		if test -f ../build/lib/libptf77blas.a -a -f ../build/lib/libptcblas.a; then \
			ar x ../build/lib/libptf77blas.a && \
			ar x ../build/lib/libptcblas.a; \
		else \
			ar x ../build/lib/libf77blas.a && \
			ar x ../build/lib/libcblas.a; \
		fi
	ar r libblas.a tmp/*.o
	rm -rf tmp
	gfortran $(LDFLAGS) -shared -Wl,-soname=libblas.so.3 -o libblas.so.$(DEB_VERSION_UPSTREAM) \
		-Wl,--whole-archive libblas.a -Wl,--no-whole-archive \
		-L. -latlas $$(test -f build/lib/libptcblas.a && echo -lpthread) -lm -lc
	ln -sf libblas.so.$(DEB_VERSION_UPSTREAM) libblas.so.3
	ln -sf libblas.so.$(DEB_VERSION_UPSTREAM) libblas.so

	# Kludge to fix blas-atlas.pc by adding -lpthread when needed
	if test -f build/lib/libptcblas.a; then sed -i 's/^Libs.private: \(.*\)/Libs.private: \1 -lpthread/' debian/blas-atlas.pc; fi

	# Create static and shared full LAPACK
	# Note that we unpack liblapack_atlas.a after liblapack_pic.a, in order to overwrite routines in the latter
	mkdir tmp
	cd tmp && \
		ar x /usr/lib/$(DEB_HOST_MULTIARCH)/liblapack_pic.a && \
		ar x ../build/lib/liblapack_atlas.a
	ar r liblapack.a tmp/*.o
	rm -rf tmp
	gfortran $(LDFLAGS) -shared -Wl,-soname=liblapack.so.3 -o liblapack.so.$(DEB_VERSION_UPSTREAM) \
		-Wl,--whole-archive liblapack.a -Wl,--no-whole-archive \
		-L. -lblas -latlas -lm -lc
	ln -sf liblapack.so.$(DEB_VERSION_UPSTREAM) liblapack.so.3
	ln -sf liblapack.so.$(DEB_VERSION_UPSTREAM) liblapack.so

override_dh_auto_build-indep:
	# Build PDF documentation
ifeq (,$(filter nodoc,$(DEB_BUILD_OPTIONS)))
	make -C TexDoc atlas_contrib.pdf atlas_devel.pdf atlas_install.pdf cblasqref.pdf f77blasqref.pdf lapackqref.pdf
endif

override_dh_auto_test-arch:
	make -C build check
	if test -f build/lib/libptcblas.a; then make -C build ptcheck; fi

override_dh_auto_install-arch:
	make -C build install # The build system does not support setting DESTDIR at install time
	mv debian/tmp/usr/include/$(DEB_HOST_MULTIARCH)/cblas.h debian/tmp/usr/include/$(DEB_HOST_MULTIARCH)/cblas-atlas.h

override_dh_installdocs-indep:
	dh_installdocs -plibatlas-doc --doc-main-package=libatlas-base-dev

# We want packages using libblas/liblapack to depend on any BLAS/LAPACK
# alternative, and we want packages depending on ATLAS-specific libraries
# (e.g. libatlas.so) to depend specifically on libatlas3-base.
#
# Such a setting is not supported by dh_makeshlibs, so we ship a hand-crafted
# shlibs file.
execute_after_dh_makeshlibs-arch:
	cp debian/libatlas3-base.shlibs debian/libatlas3-base/DEBIAN/shlibs
	if test -f libptcblas.so; then echo "libptcblas 3 libatlas3-base" >> debian/libatlas3-base/DEBIAN/shlibs; fi
	if test -f libptf77blas.so; then echo "libptf77blas 3 libatlas3-base" >> debian/libatlas3-base/DEBIAN/shlibs; fi

override_dh_shlibdeps-arch:
	dh_shlibdeps -a -l $$(pwd)

override_dh_auto_clean:
	rm -rf build
	rm -f TexDoc/*.pdf
	rm -f debian/blas-atlas.pc debian/lapack-atlas.pc
	rm -f *.a *.so *.so.*

execute_after_dh_clean:
	rm -f $(GENERATED_DEBIAN_FILES)