#!/usr/bin/make -f

libx264N := libx264-$(shell awk '/define X264_BUILD/{print $$3}' x264.h)

include /usr/share/dpkg/architecture.mk

extra_cflags = $(CFLAGS) $(CPPFLAGS)

export DEB_LDFLAGS_MAINT_STRIP=-Wl,-Bsymbolic-functions

ifneq (,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
	NUMJOBS = $(patsubst parallel=%,%,$(filter parallel=%,$(DEB_BUILD_OPTIONS)))
	MAKEFLAGS += -j$(NUMJOBS)
endif

common_confflags += --prefix=/usr --libdir=/usr/lib/$(DEB_HOST_MULTIARCH) --disable-gpac

ifneq ($(DEB_HOST_GNU_TYPE),$(DEB_BUILD_GNU_TYPE))
common_confflags += --host=$(DEB_HOST_GNU_TYPE) --cross-prefix=$(DEB_HOST_GNU_TYPE)-
endif

ifneq (,$(filter stage1,$(DEB_BUILD_PROFILES)))
common_confflags += --disable-avs --disable-ffms
endif

# upstream defaults to forcing a bunch of optimizations on various arches;
# --disable-asm should disable them all, but then we need to figure out what
# the toolchain actually targets to turn then back on ourselves if appropriate;
# also, we try providing an optimized flavor for the arches / toolchain
# combinations where it makes sense

shared_confflags += \
	$(common_confflags) \
	--enable-shared \
	--system-libx264

opt_confflags += \
	$(common_confflags) \
	--enable-shared \
	--disable-cli \
	--libdir=$(opt_libdir)

# this is only used for the check_asm macro
ifeq ($(DEB_BUILD_GNU_TYPE),$(DEB_HOST_GNU_TYPE))
CC := gcc
else
CC := $(DEB_HOST_GNU_TYPE)-gcc
endif

do_opt := no

# X86 upstream arch, hurd-i386, i386, and kfreebsd-i386 Debian arches; upstream
# adds -march=i686 and -mfpmath=sse -msse by default and runtime detects MMX,
# SSE, SSE2 etc.
ifneq (,$(filter i386 hurd-i386,$(DEB_HOST_ARCH)))
# build an SSE optimized flavor for i386
do_opt := yes
opt_libdir := /usr/lib/$(DEB_HOST_MULTIARCH)/i686/sse2
shared_confflags += --disable-asm
endif

# PPC upstream arch, powerpc and ppc64, ppc64el Debian arches; upstream adds -maltivec
# -mabi=altivec by default
# XXX upstream: --disable-asm should disable altivec; fixed in
# 6a443d3cdf338408b1b39e7f336306d2a34703f6
ifneq (,$(filter powerpc ppc64 ppc64el,$(DEB_HOST_ARCH)))
shared_confflags += --disable-asm
opt_confflags += --disable-asm
endif

# ARM upsteam arch, arm, armeb, and armel Debian arches; upstream prepends -O3
# -fno-fast-math by default, but that's ok as we override -O and we don't care
# about -ffast-math which is said to be negligible and buggy by upstream, and
# appends -mcpu=cortex-a8 -mfpu=neon -mfloat-abi=softfp by default; upstream
# supports ARMv6t2 with runtime detection of NEON, so if the baseline supports
# ARMv6t2, use it, otherwise build a NEON opt flavor; note that NEON implies
# VFP and ARMv7 and hence the flags are ok
ifeq (armhf,$(DEB_HOST_ARCH))
# baseline from gcc-15
extra_cflags += -march=armv7-a+fp
endif

%:
	dh $@

.PHONY: debian/control
debian/control:
	sed -e 's/@libx264N@/$(libx264N)/g' $@.in > $@

debian/$(libx264N).install:
	cp debian/libx264N.install.in $@

override_dh_auto_build:
	# Build shared lib
	CFLAGS="$(extra_cflags)" LDFLAGS="$(LDFLAGS)" ./configure $(shared_confflags) \
	   || ( tail -v -n +0 config.log config.log ; exit 1 )
	$(MAKE)
	$(MAKE) install DESTDIR=$(CURDIR)/debian/install/shared
ifeq ($(do_opt),yes)
	$(MAKE) distclean
	# Build opt lib
	LDFLAGS="$(LDFLAGS)" ./configure $(opt_confflags) \
	   || ( tail -v -n +0 config.log config.log ; exit 1 )
	$(MAKE)
	$(MAKE) install DESTDIR=$(CURDIR)/debian/install/opt
endif

override_dh_auto_configure:
	# dh_auto_configure phase handled via dh_auto_build.

override_dh_auto_install:
	# dh_auto_install phase handled via dh_auto_build.

override_dh_auto_clean: debian/control
	rm -rf debian/install
	$(MAKE) -o config.mak distclean
	dh_clean config.mak2 debian/$(libx264N).install

override_dh_install: debian/$(libx264N).install
	dh_install --sourcedir=debian/install
ifeq ($(do_opt),yes)
	mkdir -p debian/$(libx264N)$(opt_libdir)
	cp -a debian/install/opt$(opt_libdir)/*.so.* debian/$(libx264N)$(opt_libdir)
endif

override_dh_missing:
	dh_missing --list-missing --sourcedir=debian/install

debian/x264.1: build
	env LD_LIBRARY_PATH="$(LD_LIBRARY_PATH):$(CURDIR)/debian/install/shared/usr/lib/$(DEB_HOST_MULTIARCH)" \
	help2man -n "fast h264 encoder" -N -s1 -S "Videolan project" -h '--fullhelp' \
		debian/install/shared/usr/bin/x264 > debian/x264.1