MINGW toolchain for bazel projects in Windows

• If You desire to keep bzlmod enabled, add following strings to your MODULE.bazel file:

bazel_dep(
    name = "mingw_toolchain"
)

git_override(
    module_name = "mingw_toolchain",
    remote = "https://github.com/vvviktor/bazel-mingw-toolchain.git",
    commit = "0ea42a31c45f0ff146058cecd124053b6915205e",
)

Add following commands to your .bazelrc file:

build --incompatible_enable_cc_toolchain_resolution             # allow bazel to use custom toolchains
build --define=MINGW_PATH="path/to/mingw"                       # define path to yuor mingw location, for example: build --define=MINGW_PATH="C:/msys64/ucrt64" 
build --define=GCC_VERSION="gcc version"                        # define gcc version used, for example: build --define=GCC_VERSION="13.2.0"

---

• If You wish to disable bzlmod, add following to your WORKSPACE:

load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")

git_repository(
    name = "mingw_toolchain",
    remote = "https://github.com/vvviktor/bazel-mingw-toolchain.git",
    commit = "0ea42a31c45f0ff146058cecd124053b6915205e",
)

Add following commands to your .bazelrc file:

build --incompatible_enable_cc_toolchain_resolution             # allow bazel to use custom toolchains
build --extra_toolchains="@mingw_toolchain//toolchain:mingw_cc_toolchain" --extra_execution_platforms="@mingw_toolchain//platform:windows_platform"
build --define=MINGW_PATH="path/to/mingw"                       # define path to yuor mingw location, for example: build --define=MINGW_PATH="C:/msys64/ucrt64" 
build --define=GCC_VERSION="gcc version"                        # define gcc version used, for example: build --define=GCC_VERSION="13.2.0"
common --noenable_bzlmod

---

Toolchain allows usage of --compilation_mode dbg|opt build option.

Default flags defined in config/config.bzl:

• for all actions: -Wextra -Wall
• for --compilation_mode dbg: -g -Og + linker flags -Wl,--gc-sections
• for --compilation_mode opt: -g0 -O3 -DNDEBUG -ffunction-selections -fdata-selections