#!/usr/bin/make -f
include /usr/share/dpkg/default.mk
export DEB_BUILD_MAINT_OPTIONS=hardening=+all

# Disable unaligned access on armhf
ifneq (,$(filter $(DEB_HOST_ARCH),armhf))
	export DEB_CFLAGS_MAINT_APPEND += -mno-unaligned-access
endif

# Ensure pcre_h.jl and errno_h.jl are sorted reproducibly
export LC_ALL=C.UTF-8
# HOME is needed to avoid "mkdir(): Permission denied" while building docs.
# Some tests also need a HOME directory.
export HOME=/tmp
# If you want to do a custom build of Julia against MKL, set it to 1.
export CUSTOM_MKL ?= 0
# If you want to do a custom build for native machine architecture
export CUSTOM_NATIVE ?= 0

LLVM_VER = $(shell grep -e 'llvm-.*-dev' debian/control | cut -d- -f2)

# NOTES:
# 1. Some of these flags come from upstream's Make.inc .
# 2. To enable USE_BLAS64=0 (ILP64), we need to set INTERFACE64=1 for OpenBLAS.
# 3. Julia is tightly coupled with a specific libuv1 version. we cannot use the one provided in archive.
# 4. ∴ is unicode "therefore", ⛬  is unicode "historic site" https://unicode-table.com/en/26EC/
COMMON_FLAGS = \
	prefix=/usr \
	sysconfdir=/etc \
	DESTDIR=debian/tmp/ \
	LLVM_CONFIG=/usr/bin/llvm-config-$(LLVM_VER) \
	LLVM_VER=$(LLVM_VER) \
	MULTIARCH=$(DEB_HOST_MULTIARCH) \
	MULTIARCH_INSTALL=1 \
	NO_GIT=1 \
	TAGGED_RELEASE_BANNER='$(DEB_VENDOR) ⛬  julia/$(DEB_VERSION)' \
	USE_BINARYBUILDER=0 \
	USE_BLAS64=1  \
	USE_LLVM_SHLIB=1 \
	USE_SYSTEM_BLAS=0 \
	USE_SYSTEM_CURL=1 \
	USE_SYSTEM_DSFMT=1 \
	USE_SYSTEM_GMP=1 \
	USE_SYSTEM_LAPACK=0 \
	USE_SYSTEM_LIBGIT2=1 \
	USE_SYSTEM_LIBSSH2=1 \
	USE_SYSTEM_LIBUNWIND=1 \
	USE_SYSTEM_LIBUV=0 \
	USE_SYSTEM_LLVM=1 \
	USE_SYSTEM_MBEDTLS=1 \
	USE_SYSTEM_MPFR=1 \
	USE_SYSTEM_OPENSPECFUN=1 \
	USE_SYSTEM_P7ZIP=1 \
	USE_SYSTEM_PATCHELF=1 \
	USE_SYSTEM_PCRE=1 \
	USE_SYSTEM_SUITESPARSE=0 \
	USE_SYSTEM_UTF8PROC=1 \
	USE_SYSTEM_ZLIB=1 \
	VERBOSE=1

# Set architecture specific CPU targets. See: #910784
ifneq (,$(filter $(DEB_HOST_ARCH),amd64 kfreebsd-amd64 x32))
COMMON_FLAGS += MARCH=x86-64 \
	JULIA_CPU_TARGET="generic;sandybridge,-xsaveopt,clone_all;haswell,-rdrnd,base(1)"
else ifneq (,$(filter $(DEB_HOST_ARCH),i386 hurd-i386 kfreebsd-i386))
COMMON_FLAGS += USE_BLAS64=0
COMMON_FLAGS += MARCH=pentium4 \
	JULIA_CPU_TARGET="pentium4;sandybridge,-xsaveopt,clone_all"
else ifneq (,$(filter $(DEB_HOST_ARCH),arm64))
COMMON_FLAGS += USE_BLAS64=0
else ifneq (,$(filter $(DEB_HOST_ARCH),armhf))
COMMON_FLAGS += USE_BLAS64=0
COMMON_FLAGS += JULIA_CPU_TARGET="armv7-a;armv7-a,neon;armv7-a,neon,vfp4"
else ifneq (,$(filter $(DEB_HOST_ARCH),ppc64el))
COMMON_FLAGS += JULIA_CPU_TARGET="pwr8"
else
COMMON_FLAGS += JULIA_CPU_TARGET="generic"
endif

# Use libopenlibm on architectures that have it
ifneq (,$(filter $(DEB_HOST_ARCH),amd64 kfreebsd-amd64 x32))
COMMON_FLAGS += USE_SYSTEM_OPENLIBM=1 USE_SYSTEM_LIBM=0
else ifneq (,$(filter $(DEB_HOST_ARCH),i386 hurd-i386 kfreebsd-i386))
COMMON_FLAGS += USE_SYSTEM_OPENLIBM=1 USE_SYSTEM_LIBM=0
else ifneq (,$(filter $(DEB_HOST_ARCH),arm64 armhf mips mips64el mipsel powerpc ppc64 ppc64el))
COMMON_FLAGS += USE_SYSTEM_OPENLIBM=1 USE_SYSTEM_LIBM=0
else
# Use libm elsewhere
COMMON_FLAGS += USE_SYSTEM_OPENLIBM=0 USE_SYSTEM_LIBM=1
endif

# Use libopenblas on architectures that have it.
# Use libblas and liblapack elsewhere
ifeq (,$(filter $(DEB_HOST_ARCH),amd64 arm64 armhf i386 kfreebsd-amd64 kfreebsd-i386 mips64el ppc64el s390x))
COMMON_FLAGS += LIBBLAS=-lblas LIBBLASNAME=libblas \
                LIBLAPACK=-llapack LIBLAPACKNAME=liblapack
endif

# Set number of parallel workers for tests
ifneq (,$(filter parallel=1,$(DEB_BUILD_OPTIONS)))
TESTS_ENV += JULIA_CPU_THREADS=2
else ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
TESTS_ENV += JULIA_CPU_THREADS=$(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
else
TESTS_ENV += JULIA_CPU_THREADS=2
endif
# Restart workers exceeding maximum resident memory size (requires JULIA_CPU_THREADS >= 2)
TESTS_ENV += JULIA_TEST_MAXRSS_MB=500

ifeq (1,$(CUSTOM_MKL))
COMMON_FLAGS += USE_INTEL_MKL=1 USE_BLAS64=1 \
                LIBBLAS=-lmkl_rt LIBBLASNAME=libmkl_rt \
                LIBLAPACK=-lmkl_rt LIBLAPACKNAME=libmkl_rt \
				MKLROOT=/usr MKLLIB=/usr/lib/$(DEB_HOST_MULTIARCH)
endif
ifeq (1,$(CUSTOM_NATIVE))
COMMON_FLAGS += MARCH=native JULIA_CPU_TARGET=native
endif


%:
	dh $@

override_dh_auto_build-arch:
	dh_auto_build -- $(COMMON_FLAGS)

override_dh_auto_build-indep:
	dh_auto_build -- $(COMMON_FLAGS)
	#-$(MAKE) -C doc pdf

override_dh_auto_test-arch:
ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))
ifeq (,$(filter $(DEB_HOST_ARCH),amd64 i386))
	-env $(TESTS_ENV) make -C test $(COMMON_FLAGS)
else
	#XXX: the dash is temporary
	-env $(TESTS_ENV) make -C test $(COMMON_FLAGS)
endif
endif

override_dh_auto_test-indep:

override_dh_auto_clean:
	make $(COMMON_FLAGS) distcleanall
	make -f debian/shlibdeps.mk $(COMMON_FLAGS) clean

override_dh_auto_install:
	make $(COMMON_FLAGS) install
	rm -rf usr # Otherwise dh_install does not see debian/tmp/usr
	find debian -type f -name '*.so.debug' -delete
	find debian -type f -name .gitignore -delete
	find debian -type f -name 'LICENSE.md' -delete

override_dh_missing:
	dh_missing --list-missing

override_dh_link-arch:
	# Create *.so symlinks for dlopen'd libraries in private libdir.
	make -f debian/shlibdeps.mk $(COMMON_FLAGS)
	dh_link

override_dh_shlibdeps:
	# Generate dependencies for dlopen'd libraries using dummy executable.
	# Suppress useless dependency warnings caused by unused library symbols.
	dh_shlibdeps -- --warnings=1 debian/shlibdeps

override_dh_compress:
	dh_compress --exclude=examples/

override_dh_install-arch:
	dh_install -Xlibgcc_s -Xlibgfortran -Xlibquadmath

override_dh_install-indep:
	dh_install --exclude=build_h.jl --exclude=build.h

override_dh_fixperms:
	dh_fixperms
	# Fix shebang and mode bits
	find debian \( -type f -name '*.jl' \
		-exec grep -q '..usr/bin/env julia' '{}' \; \
		-a -exec sed -i -e 's@#!/usr/bin/env julia@#!/usr/bin/julia@g' '{}' \; \
		-a -exec chmod +x '{}' \; -print \)

# Don't strip sys.so and libjulia.so.* to keep the sanity of this program.
# https://github.com/JuliaLang/julia/issues/23115#issuecomment-320715030
#
# Julia sysimage (i.e. sys.so) sys.so is NOT compiled from any compiled
# language such as C/C++, but from Julia scripts instead. Julia precompiles .jl
# scripts under the base and stdlib directories into this ELF-formated shared
# object sys.so to speedup program startup time. A glance at the symbol table
# (readelf -sW sys.so) would illustrate that. For more detail about how such
# debugging information is useful, please refer the official documentation:
# https://docs.julialang.org/en/v1.0.0/manual/stacktraces/
#
override_dh_dwz:
	dh_dwz -X"sys.so"

override_dh_strip:
	dh_strip -X"sys.so"

override_dh_makeshlibs:
	dh_makeshlibs --no-scripts -XLLVM -Xlibopenblas64_ -Xlibcolamd -Xlibumfpack \
		-Xlibccolamd -Xlibcholmod -Xlibcamd -Xlibamd -Xlibspqr -Xlibsuitesparseconfig