Compiled on {RPI4B4G, RPI3B} cluster with 5.10.77-piCore-v8

Dependencies:
python3.8
distcc
cmake
libxml2-dev
ninja

Distcc:
RPI4B4G is the worker
(Volunteer)
tce-load -i distcc

(Worker)
mkdir ~/.distcc
# 3 jobs on localhost, 5 jobs will freeze, 4 jobs not tested
vi ~/.distcc/hosts
localhost/3
192.168.0.30/5

Turn off "-flto"  because distcc
[-DLLVM_ENABLE_LTO=Full]
[libexecdir needs setting] --> untouched

Commands:

export PATH=/usr/lib/distcc:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin

tar -xf llvm-13.0.1.src.tar.xz

cd llvm-13.0.1.src

tar -xf ../clang-13.0.1.src.tar.xz -C tools
tar -xf ../compiler-rt-13.0.1.src.tar.xz -C projects

mv tools/clang-13.0.1.src tools/clang
mv projects/compiler-rt-13.0.1.src projects/compiler-rt

mkdir build && cd build

time cmake -LAH -DCMAKE_C_FLAGS_RELEASE="-march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" \
 -DCMAKE_CXX_FLAGS_RELEASE="-march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" \
 -DCMAKE_INSTALL_PREFIX=/usr/local -DLLVM_ENABLE_FFI=ON -DLLVM_BUILD_LLVM_DYLIB=ON \
 -DLLVM_LINK_LLVM_DYLIB=ON -DLLVM_TARGETS_TO_BUILD="host" -DLLVM_ENABLE_RTTI=ON \
 -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE \
 -DLLVM_BINUTILS_INCDIR=/usr/local/include -Wno-dev -G Ninja .. 2>&1 | tee /tmp/cmake
real	1m 38.30s
user	1m 0.46s
sys	0m 26.17s

sed -i.orig -e 's:-Wl,-O3:-Wl,-Os:g' -e 's: -O3 : :g' -e 's: -g : :g' build.ninja CMakeCache.txt compile_commands.json

time ninja -j8 2>&1 | tee /tmp/ninja
real	5h 38m 17s
user	16h 17m 23s
sys	44m 3.42s

Packing:

DESTDIR=/tmp/packing-llvm ninja install
sudo ninja install

cd /tmp/packing-llvm

find -type f -exec file {} ';' > /tmp/file.info

# strip .a files
grep 'current ar archive' /tmp/file.info | cut -d : -f 1 | xargs llvm-strip --strip-debug

# strip executables, shared objects
grep 'not stripped' /tmp/file.info | grep -v 'relocatable' | cut -d : -f 1 | xargs llvm-strip --strip-unneeded

# these 'relocatable' files should not be stripped
# ./usr/local/lib/clang/13.0.1/lib/linux/clang_rt.crtbegin-aarch64.o
# ./usr/local/lib/clang/13.0.1/lib/linux/clang_rt.crtend-aarch64.o

## llvm-bin
mkdir -p /tmp/packing-llvm-bin/usr/local/bin
mkdir -p /tmp/packing-llvm-dev/usr/local/bin
mkdir -p /tmp/packing-clang/usr/local/bin
cd ./usr/local/bin
# llvm-config belongs to dev
mv llvm-config /tmp/packing-llvm-dev/usr/local/bin
mv llvm* /tmp/packing-llvm-bin/usr/local/bin
# binaries for clang
mv *clang* /tmp/packing-clang/usr/local/bin
for F in *; do
  grep -q "bin/${F}$" /tmp/clang.tcz.list && \
  mv $F /tmp/packing-clang/usr/local/bin
done
# c-index-test diagtool
mv c-index-test diagtool /tmp/packing-clang/usr/local/bin
# the rest
mv * /tmp/packing-llvm-bin/usr/local/bin
# reset directory
cd ../../..

## clang
# LTO
mkdir -p /tmp/packing-clang/usr/local/lib/bfd-plugins
mv ./usr/local/lib/LLVMgold.so /tmp/packing-clang/usr/local/lib
ln -vs /usr/local/lib/LLVMgold.so -t /tmp/packing-clang/usr/local/lib/bfd-plugins
# include/clang
mkdir -p /tmp/packing-clang/usr/local/include
mv ./usr/local/include/clang /tmp/packing-clang/usr/local/include
# include/clang-c
mv ./usr/local/include/clang-c /tmp/packing-clang/usr/local/include
# share/clang
mkdir -p /tmp/packing-clang/usr/local/share
mv ./usr/local/share/clang /tmp/packing-clang/usr/local/share
# share/scan-build
mv ./usr/local/share/scan-build  /tmp/packing-clang/usr/local/share
# share/scan-view
mv ./usr/local/share/scan-view /tmp/packing-clang/usr/local/share
# share/opt-viewer
mv ./usr/local/share/opt-viewer /tmp/packing-clang/usr/local/share
# libexec
mv ./usr/local/libexec /tmp/packing-clang/usr/local
# lib/cmake/clang
mkdir -p /tmp/packing-clang/usr/local/lib/cmake
mv ./usr/local/lib/cmake/clang /tmp/packing-clang/usr/local/lib/cmake
# lib/libclang*
mv ./usr/local/lib/libclang* /tmp/packing-clang/usr/local/lib
# lib/clang
mv ./usr/local/lib/clang /tmp/packing-clang/usr/local/lib
# lib/libscanbuild
mv ./usr/local/lib/libscanbuild /tmp/packing-clang/usr/local/lib

## llvm-lib
# libLLVM-13.0.1.so, libLLVM-13.so, libLLVM.so, libLTO.so, libLTO.so.13, libRemarks.so, libRemarks.so.13
mkdir -p /tmp/packing-llvm-lib/usr/local/lib
mv ./usr/local/lib/*so* /tmp/packing-llvm-lib/usr/local/lib

## llvm-dev
mkdir -p /tmp/packing-llvm-dev/usr/local/include
mv ./usr/local/include/llvm* /tmp/packing-llvm-dev/usr/local/include
# lib directory
mv ./usr/local/lib /tmp/packing-llvm-dev/usr/local

# remove empty directories (if any)
find /tmp/packing-* -depth -exec rmdir {} ';' 2> /dev/null

Start-up script
# /usr/local/tce.installed/clang
#!/bin/sh
# distcc
if [ -f /usr/local/tce.installed/distcc ]; then
  cd /usr/lib/distcc
  ln -sf ../../local/bin/distcc clang
  ln -sf ../../local/bin/distcc clang++
  cd /usr/local/lib/distcc
  ln -sf ../../bin/distcc clang
  ln -sf ../../bin/distcc clang++
fi