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Raspberry Pi bazel cross compilation rules

This contains a set of rules to use for cross compiling C++ to a Raspberry Pi using clang. It includes a minimal sysroot, and only needs a functioning clang compiler.

  • travis-ci Build Status

Example Usage

In tools/workspace/rpi_bazel/repository.bzl

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")


def rpi_bazel_repository(name):
    commit = "XXX"
    http_archive(
        name = name,
        url = "https://github.com/mjbots/rpi_bazel/archive/{}.zip".format(commit),
        sha256 = "XXX",
        strip_prefix = "rpi_bazel-{}".format(commit),
    )

At least an empty tools/workspace/rpi_bazel/BUILD is required.

In tools/workspace/default.bzl:

load("//tools/workspace/rpi_bazel:repository.bzl", "rpi_bazel_repository")

def add_default_repositories(excludes = []):
    if "rpi_bazel" not in excludes:
        rpi_bazel_repository(name = "rpi_bazel")

At least an empty tools/workspace/BUILD is required.

In WORKSPACE:

load("//tools/workspace:default.bzl", "add_default_repositories")

add_default_repositories()

load("@rpi_bazel//tools/workspace:default.bzl",
     rpi_bazel_add = "add_default_repositories")
rpi_bazel_add()

In tools/bazel.rc

build --crosstool_top=@rpi_bazel//tools/cc_toolchain:toolchain
test --crosstool_top=@rpi_bazel//tools/cc_toolchain:toolchain

build:pi --cpu=armeabihf
test:pi --cpu=armeabihf

build:pi --compiler=clang
test:pi --compiler=clang

Then you can build with:

bazel build --config=pi //...

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