BUILD.bazel

cc_library(
    name = "example",
    srcs = ["file.c"],
)

file.c

int function(void) { return 3; }

MODULE.bazel

bazel_dep(name = "toolchains_llvm", version = "v1.1.2")
git_override(
    module_name = "toolchains_llvm",
    commit = "a1a5013732b30b1c0b03e904726106a301913ec0",
    remote = "https://github.com/bazel-contrib/toolchains_llvm",
)

# Configure and register the toolchain.
llvm = use_extension("@toolchains_llvm//toolchain/extensions:llvm.bzl", "llvm")
llvm.toolchain(
    name = "llvm_toolchain",
    llvm_version = "18.1.8",
)
llvm.toolchain_root(
    name = "llvm_toolchain",
    path = "/opt/llvm-18",
)
use_repo(llvm, "llvm_toolchain")

register_toolchains("@llvm_toolchain//:all")

WORKSPACE

workspace(name = "ltexample")