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

install the icudtata file back into in/ folder so that main build
can now pickup this data file instead of regenerating it and wiping
out the filter changes that are expected to take effect

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

Signed-off-by: Khem Raj <[email protected]>
Suggested-by: Wouter Meek <[email protected]>
---
v2: Fix build for BE systems
v3: Unset AR and RANLIB too
v4: Install fresh icudata back into data/in folder

 meta/recipes-support/icu/icu/filter.json |  2 ++
 meta/recipes-support/icu/icu_66.1.bb     | 26 +++++++++++++++++++++---
 2 files changed, 25 insertions(+), 3 deletions(-)
 create mode 100644 meta/recipes-support/icu/icu/filter.json

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..736bec4605 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 \
+           ${DATA_SRC_URI};name=data \
+           file://filter.json \
            file://icu-pkgdata-large-cmd.patch \
            file://fix-install-manx.patch \
            file://0001-Fix-big-endian-build.patch \
@@ -28,8 +31,25 @@ SRC_URI = "${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 ${S}
+    unset AR CC CPP CXX RANLIB CFLAGS CPPFLAGS CXXFLAGS LDFLAGS
+    ICU_DATA_FILTER_FILE=${WORKDIR}/filter.json \
+    ./runConfigureICU Linux --with-data-packaging=archive
+    oe_runmake ${PARALLEL_MAKE}
+    install -Dm644 ${S}/data/out/icudt${ICU_MAJOR_VER}l.dat 
${S}/data/in/icudt${ICU_MAJOR_VER}l.dat
+}
+
+do_make_icudata() {
+    :
+}
+
+addtask make_icudata before do_configure after do_patch
-- 
2.26.0

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