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cross_compilation.md

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Cross compilation

rules_go can cross-compile Go projects to any platform the Go toolchain supports. The simplest way to do this is by setting the --platforms flag on the command line.

$ bazel build --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64 //my/project

You can replace linux_amd64 in the example above with any valid GOOS / GOARCH pair. To list all platforms, run this command:

$ bazel query 'kind(platform, @io_bazel_rules_go//go/toolchain:all)'

By default, cross-compilation will cause Go targets to be built in "pure mode", which disables cgo; cgo files will not be compiled, and C/C++ dependencies will not be compiled or linked.

Cross-compiling cgo code is possible, but not fully supported. You will need to define and register a C/C++ toolchain and platforms. You'll need to ensure it works by building cc_binary and cc_library targets with the --platforms command line flag set. Then, to build a mixed Go / C / C++ project, add pure = "off" to your go_binary target and run Bazel with --platforms.