For learning - not for production

In this project, we register a custom toolchain to be able to cross-compile the project to Windows using the MinGW64 project (which is a GCC) running on Linux x86/x64 but targetting Windows x86/x64.

The example project to build with that toolchain is one shared library used by one executable. This is tailored to Ubuntu 22.04 with MinGW64 version 10.

Bazel needs to be built from my fork where a bug is fixed which otherwise causes linking to fail in upstream Bazel.

You need to install MinGW64 (once):

sudo apt install gcc-mingw-w64 g++-mingw-w64

Then you can build for x86_64,

bazel build --config=wine64 //example/greeter

or for i686

bazel build --config=wine32 //example/greeter

The configs imply --platforms=//toolchain:mingw-x86_64-win32 and --platforms=//toolchain:mingw-x86_32-win32, respectively. As those are only for testing, there are no -posix equivalents.

You need to install Wine (once):

sudo apt install --no-install-recommends wine32 # for i686
sudo apt install --no-install-recommends wine64 # for x86_64

Then you can run for x86_64,

bazel run --config=wine64 //example/greeter Felix

or for i686

bazel run --config=wine32 //example/greeter Felix