tce-load -i compiletc 

wget https://github.com/unicode-org/icu/releases/download/release-78.3/icu4c-78.3-sources.tgz

cd icu/source

CC="gcc -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -fno-exceptions" ./configure --prefix=/usr/local --localstatedir=/var

find . -name icudefs.mk -type f -exec sed -i 's/-O2//g' {} \;
find . -name Makefile -type f -exec sed -i 's/-O2//g' {} \;

make [11m 21.46s]
sudo make install