Compiled on RPI4B-8G with 6.6.47-piCore-v8 on portable SSD

Compile Flags:
## test build ##
CFLAGS='-march=armv8-a+crc -mtune=cortex-a72 -Os -pipe'
CXXFLAGS='-march=armv8-a+crc -mtune=cortex-a72 -Os -pipe'
EXTRA_C=' -L/usr/local/lib -flto -fuse-ld=gold -fuse-linker-plugin -fno-exceptions'
EXTRA_CXX=' -L/usr/local/lib -flto -fuse-ld=gold -fuse-linker-plugin -fno-exceptions -fno-rtti'
CFLAGS="${CFLAGS}${EXTRA_C}"
CXXFLAGS="${CXXFLAGS}${EXTRA_CXX}"
LDFLAGS='-Wl,-L/usr/local/lib -Wl,-O1'
export CFLAGS CXXFLAGS LDFLAGS

## actual package ##
CC="clang --gcc-install-dir=$(echo /usr/local/lib/gcc/*/*)"
CXX="clang++ --gcc-install-dir=$(echo /usr/local/lib/gcc/*/*)"
CFLAGS='-march=armv8-a+crc -mtune=cortex-a72 -Os -pipe'
CXXFLAGS='-march=armv8-a+crc -mtune=cortex-a72 -Os -pipe'
EXTRA_C=' -L/usr/local/lib -flto=full -fno-exceptions'
EXTRA_CXX=' -L/usr/local/lib -flto=full -fno-exceptions -fno-rtti'
CFLAGS="${CFLAGS}${EXTRA_C}"
CXXFLAGS="${CXXFLAGS}${EXTRA_CXX}"
LDFLAGS='-fuse-ld=lld -L/usr/local/lib -Wl,-O1 -Wl,-rpath=/usr/local/lib'
export CC CXX CFLAGS CXXFLAGS LDFLAGS

Dependencies:
compiletc
llvm19-dev
cmake
python3.12
ninja
clang

Commands:

sudo busybox cp $(realpath /usr/local/bin/llvm-config) /usr/local/bin/llvm-config

cd /mnt/mmcblk0p5/compile

VER=19.1.0

wget https://github.com/llvm/llvm-project/releases/download/llvmorg-${VER}/lld-${VER}.src.tar.xz
wget https://github.com/llvm/llvm-project/releases/download/llvmorg-${VER}/libunwind-${VER}.src.tar.xz
wget https://github.com/llvm/llvm-project/releases/download/llvmorg-${VER}/cmake-${VER}.src.tar.xz

tar -xf lld-${VER}.src.tar.xz
tar -xf libunwind-${VER}.src.tar.xz
tar -xf cmake-${VER}.src.tar.xz

mv libunwind-${VER}.src/include/mach-o/ lld-${VER}.src/MachO/
mv cmake-${VER}.src/ cmake/

## test builds ##
# export test flags

### GCC + GOLD ###

cd lld-${VER}.src/ && mkdir gold && cd gold

time cmake -DCMAKE_C_FLAGS_MINSIZEREL="$CFLAGS" -DCMAKE_CXX_FLAGS_MINSIZEREL="$CXXFLAGS" \
 -DCMAKE_BUILD_TYPE=MINSIZEREL -DLLVM_ENABLE_PROJECTS=lld -DCMAKE_INSTALL_PREFIX=/usr/local -G Ninja ..
real    0m 6.81s
user    0m 4.88s
sys     0m 1.93s

time ninja -j4
real    36m 31.56s
user    2h 1m 46s
sys     1m 44.80s

sudo ninja install

### CLANG + LLD ###

cd .. && mkdir build && cd build

time cmake -DCMAKE_C_FLAGS_MINSIZEREL="$CFLAGS" -DCMAKE_CXX_FLAGS_MINSIZEREL="$CXXFLAGS" \
 -DCMAKE_BUILD_TYPE=MINSIZEREL -DLLVM_ENABLE_PROJECTS=lld -DCMAKE_INSTALL_PREFIX=/usr/local -G Ninja ..
real    0m 8.17s
user    0m 5.70s
sys     0m 2.47s

time ninja -j4
real    36m 29.81s
user    2h 1m 37s
sys     1m 44.90s

DESTDIR=/tmp/packing-lld ninja install

cd /tmp/packing-lld/usr/local/bin/

L=$(busybox ls -1 | grep -v '^lld$')

rm -f $L

for LINK in $L; do ln -s lld $LINK; done

cd /tmp/ && sudo chown -R root:root packing-lld

mksquashfs packing-lld/ /mnt/mmcblk0p3/tce/optional/lld.tcz -quiet