icu: use separate .dat file for data

This changes the build from using data embedded in libicudata.so
to using a separate .dat file which is then loaded.

This allows manipulation of this data using icu tools, and fixes
cross-compiling from little endian to big endian architectures,
as we can handle the endian conversion ourselves.

srcpkgs/icu/template

@@ -3,12 +3,14 @@
 #       next soname bump.
 pkgname=icu
 version=64.2
-revision=1
+revision=2
 wrksrc=icu
 build_wrksrc=source
 build_style=gnu-configure
+# use archive data instead of .so data for correct cross-compiling
+configure_args="--with-data-packaging=archive"
 hostmakedepends="pkg-config"
-short_desc="Robust and full-featured Unicode services"
+short_desc="Robust and fully-featured Unicode libraries"
 maintainer="Juan RP <xtraeme@voidlinux.org>"
 license="ICU"
 homepage="http://www.icu-project.org/"
@@ -19,6 +21,12 @@ if [ "$CROSS_BUILD" ]; then
 	configure_args+=" --with-cross-build=${XBPS_BUILDDIR}/${wrksrc}/host-icu"
 fi
 
+# we will be managing icudata manually, because when cross-compiling for
+# another endianness the output data is broken... fortunately, we can use
+# icupkg to convert host-endianness data to target-endianness data
+_icu_dat="icudt${version%.*}"
+_icu_data="source/data/in"
+
 pre_configure() {
 
 	# strtod_l() is not supported by musl; also xlocale.h is missing
@@ -51,10 +59,36 @@ pre_configure() {
 	# probably other stuff breaks too, so let's just do it.
 	# See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=653457
 	sed -e 's,-nostdlib,,g' -i ${wrksrc}/source/config/mh-linux
+
+	export CFLAGS="${CFLAGS} -DICU_DATA_DIR=\\\"/usr/share/icu/${version}\\\""
+	export CXXFLAGS="${CFLAGS} -DICU_DATA_DIR=\\\"/usr/share/icu/${version}\\\""
+
+	# makefile dependency bug: this directory needs to be created manually
+	mkdir -p ${wrksrc}/source/data/out/tmp
 }
 
 post_install() {
 	vlicense $wrksrc/LICENSE
+
+	# handled separately
+	rm -f ${DESTDIR}/usr/share/icu/${version}/${_icu_dat}${XBPS_TARGET_ENDIAN%e}.dat
+
+	# for little endian just use the file that's there
+	if [ "$XBPS_TARGET_ENDIAN" != "be" ]; then
+		return
+	fi
+
+	# for big endian, we need to convert the file that's there with icupkg
+	local _icupkg_path="${DESTDIR}/usr"
+	if [ "$CROSS_BUILD" ]; then
+		_icupkg_path="${wrksrc}/host-icu"
+	fi
+
+	rm -f ${wrksrc}/${_icu_data}/${_icu_dat}b.dat
+
+	LD_LIBRARY_PATH="${_icupkg_path}/lib" ${_icupkg_path}/bin/icupkg -tb \
+	 ${wrksrc}/${_icu_data}/${_icu_dat}l.dat \
+	 ${wrksrc}/${_icu_data}/${_icu_dat}b.dat
 }
 
 icu-devel_package() {
@@ -74,5 +108,11 @@ icu-libs_package() {
 	short_desc+=" - shared libs"
 	pkg_install() {
 		vmove "usr/lib/*.so.*"
+
+		# install data manually
+		vmkdir "usr/share/icu/${version}"
+		install -Dm644 \
+			${wrksrc}/${_icu_data}/${_icu_dat}${XBPS_TARGET_ENDIAN%e}.dat \
+			${PKGDESTDIR}/usr/share/icu/${version}
 	}
 }