[PATCH V2] icu: Add knobs to generate a subset of ICU data

["Khem Raj" <raj.khem@gmail.com>]

Recent versions of ICU (64+) provides a tool for configuring ICU
locale data file with finer granularity [1]

Default generated size for libicudata.so.66.1 is ~27M, which is quite
large for embedded systems and all of them may not even need all locale
data.

This patch calls the icudata buildtool during configure on the icudata
and utilizes a filter called 'filter.json` ( empty by default) to
create the data, default behavior should remain same but someone can
add a filter.json in own layer to configure this data, e.g.

{
  "localeFilter": {
    "filterType": "language",
    "whitelist": [
      "en",
      "de",
      "it"
    ]
  }
}

would only generate the locale data for english/german/italian

This would reduce the size of libicudata.so.66.1 to 12M

Ensure that icudata is generated using host-tools so it can deal with
endianness correctly, when host and target systems have different
endianness

[1] https://github.com/unicode-org/icu/blob/master/docs/userguide/icu_data/buildtool.md

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Suggested-by: Wouter Meek <w.meek@metrological.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
v2: Fix build for BE systems

 meta/recipes-support/icu/icu.inc         |  2 +-
 meta/recipes-support/icu/icu/filter.json |  2 ++
 meta/recipes-support/icu/icu_66.1.bb     | 25 +++++++++++++++++++++---
 3 files changed, 25 insertions(+), 4 deletions(-)
 create mode 100644 meta/recipes-support/icu/icu/filter.json

diff --git a/meta/recipes-support/icu/icu.inc b/meta/recipes-support/icu/icu.inc
index 6d9728903d..d6ff82926e 100644
--- a/meta/recipes-support/icu/icu.inc
+++ b/meta/recipes-support/icu/icu.inc
@@ -59,7 +59,7 @@ do_install_append_class-target() {
     # Use icupkg to re-generate it.
     if [ "${SITEINFO_ENDIANNESS}" = "be" ] ; then
         rm -f ${D}/${datadir}/${BPN}/${PV}/icudt${ICU_MAJOR_VER}b.dat
-        icupkg -tb ${S}/data/in/icudt${ICU_MAJOR_VER}l.dat ${D}/${datadir}/${BPN}/${PV}/icudt${ICU_MAJOR_VER}b.dat
+        icupkg -tb ${S}/data/out/icudt${ICU_MAJOR_VER}l.dat ${D}/${datadir}/${BPN}/${PV}/icudt${ICU_MAJOR_VER}b.dat
     fi
 	
 	# Remove build host references...
diff --git a/meta/recipes-support/icu/icu/filter.json b/meta/recipes-support/icu/icu/filter.json
new file mode 100644
index 0000000000..2c63c08510
--- /dev/null
+++ b/meta/recipes-support/icu/icu/filter.json
@@ -0,0 +1,2 @@
+{
+}
diff --git a/meta/recipes-support/icu/icu_66.1.bb b/meta/recipes-support/icu/icu_66.1.bb
index 5018464c14..0e1304b52d 100644
--- a/meta/recipes-support/icu/icu_66.1.bb
+++ b/meta/recipes-support/icu/icu_66.1.bb
@@ -18,7 +18,10 @@ ARM_INSTRUCTION_SET_armv4 = "arm"
 ARM_INSTRUCTION_SET_armv5 = "arm"
 
 BASE_SRC_URI = "https://github.com/unicode-org/icu/releases/download/release-${ICU_FOLDER}/icu4c-${ICU_PV}-src.tgz"
-SRC_URI = "${BASE_SRC_URI} \
+DATA_SRC_URI = "https://github.com/unicode-org/icu/releases/download/release-${ICU_FOLDER}/icu4c-${ICU_PV}-data.zip"
+SRC_URI = "${BASE_SRC_URI};name=code \
+           ${DATA_SRC_URI};name=data \
+           file://filter.json \
            file://icu-pkgdata-large-cmd.patch \
            file://fix-install-manx.patch \
            file://0001-Fix-big-endian-build.patch \
@@ -28,8 +31,24 @@ SRC_URI = "${BASE_SRC_URI} \
 SRC_URI_append_class-target = "\
            file://0001-Disable-LDFLAGSICUDT-for-Linux.patch \
           "
-SRC_URI[md5sum] = "b33dc6766711517c98d318447e5110f8"
-SRC_URI[sha256sum] = "52a3f2209ab95559c1cf0a14f24338001f389615bf00e2585ef3dbc43ecf0a2e"
+SRC_URI[code.sha256sum] = "52a3f2209ab95559c1cf0a14f24338001f389615bf00e2585ef3dbc43ecf0a2e"
+SRC_URI[data.sha256sum] = "8be647f738891d2beb79d48f99077b3499948430eae6f1be112553b15ab0243e"
 
 UPSTREAM_CHECK_REGEX = "icu4c-(?P<pver>\d+(_\d+)+)-src"
 UPSTREAM_CHECK_URI = "https://github.com/unicode-org/icu/releases"
+
+do_make_icudata_class-target () {
+    rm -rf ${S}/data
+    cp -a ${WORKDIR}/data ${S}
+    cd ${S}
+    unset CC CPP CXX CFLAGS CPPFLAGS CXXFLAGS LDFLAGS
+    ICU_DATA_FILTER_FILE=${WORKDIR}/filter.json \
+    ./runConfigureICU Linux --with-data-packaging=archive
+    oe_runmake ${PARALLEL_MAKE}
+}
+
+do_make_icudata() {
+    :
+}
+
+addtask make_icudata before do_configure after do_patch
-- 
2.26.0