Bazel build system supports integration with custom C/C++ toolchains. This project defines toolchains for x86_64 (64 bit), ARMv7-A (32 bit), and ARMv8-A (64 bit) processors based on the standard Linux crosstool packages, as well as for Windows x86_64 and ARM64 using Visual Studio.
The steps below describe how to setup cross-compilation for projects at github.com/google-coral/.
For dpkg-based Linux systems (e.g. Debian, Ubuntu)
dpkg --add-architecture armhf
dpkg --add-architecture arm64
apt-get update && apt-get install -y build-essential crossbuild-essential-armhf crossbuild-essential-arm64
For Windows, install Visual Studio 2017 or newer.
You need to know the exact git commit of this repo to use:
COMMIT=$(git ls-remote https://github.com/google-coral/crosstool master | awk '{print $1}')
and corresponding SHA-256 hash:
SHA256=$(curl -L "https://github.com/google-coral/crosstool/archive/${COMMIT}.tar.gz" | sha256sum | awk '{print $1}')
Add the following piece of code to your WORKSPACE file while replacing
${COMMIT} and ${SHA256} values:
http_archive(
name = "coral_crosstool",
sha256 = "${SHA256}",
strip_prefix = "crosstool-${COMMIT}",
urls = [
"https://github.com/google-coral/crosstool/archive/${COMMIT}.tar.gz",
],
)
load("@coral_crosstool//:configure.bzl", "cc_crosstool")
cc_crosstool(name = "crosstool")
To compile for regular x86_64:
bazel build --crosstool_top=@crosstool//:toolchains --compiler=gcc --cpu=k8 <OPTIONS>
To compile for ARMv7-A (e.g. Raspberry Pi 3 or 4):
bazel build --crosstool_top=@crosstool//:toolchains --compiler=gcc --cpu=armv7a <OPTIONS>
To compile for ARMv8-A (e.g. Coral Dev Board):
bazel build --crosstool_top=@crosstool//:toolchains --compiler=gcc --cpu=aarch64 <OPTIONS>
To compile for Windows x86_64:
bazel build --crosstool_top=@crosstool//:toolchains --compiler=msvc-cl-x64
To compile for Windows ARM64:
bazel build --crosstool_top=@crosstool//:toolchains --compiler=msvc-cl-arm64 --host_crosstool_top=@crosstool//:toolchains --host_compiler=msvc-cl-x64