1
2## Cross compilation
3
4rules_go can cross-compile Go projects to any platform the Go toolchain
5supports. The simplest way to do this is by setting the `--platforms` flag on
6the command line.
7
8``` bash
9$ bazel build --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64 //my/project
10```
11
12You can replace `linux_amd64` in the example above with any valid
13GOOS / GOARCH pair. To list all platforms, run this command:
14
15``` bash
16$ bazel query 'kind(platform, @io_bazel_rules_go//go/toolchain:all)'
17```
18
19By default, cross-compilation will cause Go targets to be built in "pure mode",
20which disables cgo; cgo files will not be compiled, and C/C++ dependencies will
21not be compiled or linked.
22
23Cross-compiling cgo code is possible, but not fully supported. You will need to
24[write a CROSSTOOL file] that describes your C/C++ toolchain. You'll need to
25ensure it works by building `cc_binary` and `cc_library` targets with the
26`--cpu` command line flag set. Then, to build a mixed Go / C / C++ project,
27add `pure = "off"` to your `go_binary` target and run Bazel with `--cpu`
28and `--platforms`.
29
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