Build Flutter engine for linux-arm64

HW:

OS:



caution

Make sure the command ran successfully before running the next command!!

Host(Linux x86_64)

mkdir -p $HOME/flutter-engine/sdk/toolchain \
&& mkdir -p $HOME/flutter-engine/sdk/sysroot \
&& mkdir -p $HOME/flutter-engine/engine
info

Using docker, run
docker run -it --volume="$HOME/flutter-engine:/root/flutter-engine:shared" ubuntu:18.04 /bin/bash.
Then, run apt update && apt install sudo on the container before following what is shown below.

sudo apt update \
&& sudo apt install -y bison build-essential cmake curl flex git gcc \
lsb-release libgmp-dev make ninja-build pkg-config python python3 \
rsync subversion texinfo vim wget \
&& sudo apt autoremove -y

sysroot

It may vary depending on various conditions. If symbolic links are broken, you will get some errors when following the steps below.

info

When I tested this, most of the errors occured for this reason.

Target(Linux ARM64)

Connect the SD card or eMMC with OS to your SBC.

sudo apt update \
&& sudo apt install -y build-essential clang fontconfig git libdrm-dev \
libegl-mesa0 libgbm-dev libgl1-mesa-dev libgles2-mesa-dev libglvnd-dev \
libgtk-3-dev liblzma-dev ninja-build pkg-config rsync symlinks \
ttf-mscorefonts-installer vim \
&& sudo apt autoremove -y \
&& sudo fc-cache
sudo symlinks -crs /*
sudo rsync -a -e 'ssh -p <host port>' /lib /usr /etc \
<host user>@<host ip>:~/flutter-engine/sdk/sysroot

Host(Linux x86_64)

When I built all successfully, the directory structure is shown below. Since / (root) is copied to $HOME/flutter-engine/sdk/sysroot, setting a symbolic link path to an absolute path can break symbolic links.

$HOME/flutter-engine/sdk/sysroot
├── lib -> usr/lib
└── usr
├── include
│ └── ...
└── lib
├── aarch64-linux-gnu
│   ├── crt1.o
│   ├── crti.o
│   ├── crtn.o
│   ├── ld-2.29.so
│   ├── ld-linux-aarch64.so.1 -> ld-2.29.so
│   ├── libc-2.29.so
│   ├── libc_nonshared.a
│   ├── libc.so
│   ├── libc.so.6 -> libc-2.29.so
│   ├── libdl-2.29.so
│   ├── libdl.so -> ../../../lib/aarch64-linux-gnu/libdl.so.2
│   ├── libdl.so.2 -> libdl-2.29.so
│   ├── libgcc_s.so.1
│   ├── libm-2.29.so
│   ├── libm.so -> libm.so.6
│   ├── libm.so.6 -> libm-2.29.so
│   ├── libpthread-2.29.so
│   ├── libpthread.so -> ../../../lib/aarch64-linux-gnu/libpthread.so.0
│   ├── libpthread.so.0 -> libpthread-2.29.so
│   ├── librt-2.29.so
│   ├── librt.so -> ../../../lib/aarch64-linux-gnu/librt.so.1
│   ├── librt.so.1 -> librt-2.29.so
│   ├── libstdc++.so.6 -> libstdc++.so.6.0.26
│   └── libstdc++.so.6.0.26
└── gcc
└── aarch64-linux-gnu
└── 8
├── crtbegin.o
├── crtbeginS.o
├── crtend.o
├── crtendS.o
├── libgcc.a
├── libgcc_s.so -> ../../../aarch64-linux-gnu/libgcc_s.so.1
└── libstdc++.so -> ../../../aarch64-linux-gnu/libstdc++.so.6

Clang installation

clang and LLVM

git clone --branch=llvmorg-11.0.0 --depth=1 \
https://github.com/llvm/llvm-project.git $HOME/flutter-engine/llvm-project
cd $HOME/flutter-engine/llvm-project \
&& [ -d build_llvm ] && sudo rm -r build_llvm ;\
mkdir build_llvm && cd build_llvm \
&& cmake -G Ninja \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_CROSSCOMPILING=True \
-DCMAKE_INSTALL_PREFIX=$HOME/flutter-engine/sdk/toolchain \
-DLLVM_ENABLE_PROJECTS=clang \
-DLLVM_DEFAULT_TARGET_TRIPLE=aarch64-linux-gnu \
-DLLVM_TARGET_ARCH=AArch64 \
-DLLVM_TARGETS_TO_BUILD=AArch64 \
../llvm \
&& ninja \
&& sudo ninja install

binutils-gdb

git clone --depth=1 git://sourceware.org/git/binutils-gdb.git \
$HOME/flutter-engine/binutils-gdb
cd $HOME/flutter-engine/binutils-gdb \
&& ./configure --prefix="$HOME/flutter-engine/sdk/toolchain" \
--enable-gold \
--enable-ld \
--target=aarch64-linux-gnu \
&& make -j$(expr $(expr $(nproc) \* 6) \/ 5) \
&& sudo make install
sudo cp -ap $HOME/flutter-engine/sdk/toolchain/bin/aarch64-linux-gnu-* \
$HOME/flutter-engine/sdk/sysroot/usr/bin/

libcxxabi and libcxx

cd $HOME/flutter-engine/llvm-project \
&& [ -d build_libcxxabi ] && sudo rm -r build_libcxxabi ;\
mkdir build_libcxxabi && cd build_libcxxabi \
&& cmake -G Ninja \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_CROSSCOMPILING=True \
-DCMAKE_SYSROOT=$HOME/flutter-engine/sdk/sysroot \
-DCMAKE_INSTALL_PREFIX=$HOME/flutter-engine/sdk/toolchain \
-DCMAKE_SYSTEM_NAME=Linux \
-DCMAKE_SYSTEM_PROCESSOR=AArch64 \
-DCMAKE_C_COMPILER=$HOME/flutter-engine/sdk/toolchain/bin/clang \
-DCMAKE_CXX_COMPILER=$HOME/flutter-engine/sdk/toolchain/bin/clang++ \
-DLLVM_TARGETS_TO_BUILD=AArch64 \
-DLIBCXXABI_ENABLE_EXCEPTIONS=False \
../libcxxabi \
&& ninja \
&& sudo ninja install
cd $HOME/flutter-engine/llvm-project \
&& [ -d build_libcxx ] && sudo rm -r build_libcxx ;\
mkdir build_libcxx && cd build_libcxx \
&& cmake -G Ninja \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_CROSSCOMPILING=True \
-DCMAKE_SYSROOT=$HOME/flutter-engine/sdk/sysroot \
-DCMAKE_INSTALL_PREFIX=$HOME/flutter-engine/sdk/toolchain \
-DCMAKE_SYSTEM_NAME=Linux \
-DCMAKE_SYSTEM_PROCESSOR=AArch64 \
-DCMAKE_C_COMPILER=$HOME/flutter-engine/sdk/toolchain/bin/clang \
-DCMAKE_CXX_COMPILER=$HOME/flutter-engine/sdk/toolchain/bin/clang++ \
-DLLVM_TARGETS_TO_BUILD=AArch64 \
-DLIBCXX_ENABLE_SHARED=False \
-DLIBCXX_ENABLE_EXCEPTIONS=False \
-DLIBCXX_ENABLE_RTTI=False \
-DLIBCXX_CXX_ABI=libcxxabi \
-DLIBCXX_CXX_ABI_INCLUDE_PATHS=$HOME/flutter-engine/llvm-project/libcxxabi/include \
-DLIBCXX_CXX_ABI_LIBRARY_PATH=$HOME/flutter-engine/sdk/toolchain/lib \
-DLIBCXX_ENABLE_STATIC_ABI_LIBRARY=True \
../libcxx \
&& ninja \
&& sudo ninja install

depot_tools

git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git $HOME/flutter-engine/depot_tools
export PATH=$PATH:$HOME/flutter-engine/depot_tools

flutter-engine

Ref: https://github.com/flutter/flutter/wiki/Setting-up-the-Engine-development-environment

info

After reading the Ref above, follow flutter-engine part.

echo 'solutions = [
{
"managed": False,
"name": "src/flutter",
"url": "git@github.com:hhk7734/engine.git",
"custom_deps": {},
"deps_file": "DEPS",
"safesync_url": "",
},
]' >> $HOME/flutter-engine/engine/.gclient \
&& cd $HOME/flutter-engine/engine \
&& gclient sync
cd $HOME/flutter-engine/engine/src/flutter \
&& git remote add upstream git@github.com:flutter/engine.git
cd $HOME/flutter-engine/engine/src \
&& sudo ./build/install-build-deps-android.sh
sudo ./build/install-build-deps.sh
sudo ./flutter/build/install-build-deps-linux-desktop.sh
cd $HOME/flutter-engine/engine/src/flutter \
&& git pull upstream master && gclient sync
cd $HOME/flutter-engine/engine/src \
&& [ -d out/linux_debug_arm64 ] && sudo rm -r out/linux_debug_arm64 ;\
./flutter/tools/gn \
--clang \
--target-sysroot $HOME/flutter-engine/sdk/sysroot \
--target-toolchain $HOME/flutter-engine/sdk/toolchain \
--target-triple aarch64-linux-gnu \
--target-os linux \
--linux-cpu arm64 \
--embedder-for-target \
--no-lto \
--no-goma \
--runtime-mode debug
ninja -C out/linux_debug_arm64
cd $HOME/flutter-engine/engine/src \
&& [ -d out/linux_release_arm64 ] && sudo rm -r out/linux_release_arm64 ;\
./flutter/tools/gn \
--clang \
--target-sysroot $HOME/flutter-engine/sdk/sysroot \
--target-toolchain $HOME/flutter-engine/sdk/toolchain \
--target-triple aarch64-linux-gnu \
--target-os linux \
--linux-cpu arm64 \
--embedder-for-target \
--no-lto \
--no-goma \
--runtime-mode release
ninja -C out/linux_release_arm64
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