added Windows target testing

.build.yml

@@ -5,6 +5,7 @@ packages:
   - qemu-user-static
   - binfmt-support
   - moreutils
+  - wine-binfmt
 sources:
   - https://git.sr.ht/~motiejus/bazel-zig-cc
 environment:

README.md

@@ -401,8 +401,9 @@ This repository is used on the following (host) platforms:
 - `windows_amd64`, a.k.a. `x64`.
 
 The tests are running (CId) on linux-amd64, and are assuming the kernel is
-configured to run arm64 binaries. There are two reasonably convenient ways to
-configure arm64 emulation:
+configured to run `linux_arm64` and `windows_amd64` binaries.
+
+There are two reasonably convenient ways to configure `linux_arm64` emulation:
 
 1. Install and configure [`binfmt_misc`][binfmt_misc]:
    ```
@@ -414,6 +415,11 @@ configure arm64 emulation:
    docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
    ```
 
+In order to install and configure `windows_amd64` emulation:
+```
+apt install wine-binfmt
+```
+
 ## Transient docker environment
 
 A standalone Docker environment to play with bazel-zig-cc:

WORKSPACE

@@ -51,11 +51,13 @@ zig_toolchains()
 
 register_toolchains(
     # if no `--platform` is specified, these toolchains will be used for
-    # (linux,darwin)x(amd64,arm64)
+    # (linux,darwin,windows)x(amd64,arm64)
     "@zig_sdk//toolchain:linux_amd64_gnu.2.19",
     "@zig_sdk//toolchain:linux_arm64_gnu.2.28",
     "@zig_sdk//toolchain:darwin_amd64",
     "@zig_sdk//toolchain:darwin_arm64",
+    "@zig_sdk//toolchain:windows_amd64",
+    "@zig_sdk//toolchain:windows_arm64",
 
     # amd64 toolchains for libc-aware platforms:
     "@zig_sdk//libc_aware/toolchain:linux_amd64_gnu.2.19",

ci/test

@@ -1,3 +1,13 @@
-#!/bin/sh
+#!/bin/bash
+set -euo pipefail
 
-exec bazel test ...
+bazel test ...
+
+# Windows tests
+# Unfortunately wine-binfmt breaks within the bazel sandbox, so we disable it
+# to run this test.
+bazel test //test/c:winver_windows_amd64 \
+    --spawn_strategy=standalone
+# There is no no easy way to run windows_arm64 binaries on Linux, so we just
+# cross compile one for testing.
+bazel build //test/c:winver_windows_arm64

test/c/BUILD

@@ -1,4 +1,4 @@
-load("@bazel-zig-cc//rules:platform.bzl", "platform_binary")
+load("@bazel-zig-cc//rules:platform.bzl", "platform_binary", "platform_test")
 
 cc_binary(
     name = "which_libc",
@@ -34,3 +34,25 @@ cc_binary(
         ("linux_arm64", "//platform:linux_arm64", "glibc_2.28"),
     ]
 ]
+
+cc_binary(
+    name = "winver",
+    srcs = ["main_winver.c"],
+    target_compatible_with = [
+        "@platforms//os:windows",
+    ],
+)
+
+platform_test(
+    name = "winver_windows_amd64",
+    src = "winver",
+    platform = "//platform:windows_amd64",
+    tags = ["manual"],
+)
+
+platform_binary(
+    name = "winver_windows_arm64",
+    src = "winver",
+    platform = "//platform:windows_arm64",
+    tags = ["manual"],
+)

test/c/main_winver.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <windows.h>
+
+int main() {
+    DWORD version = GetVersion();
+    DWORD majorVersion = (DWORD)(LOBYTE(LOWORD(version)));
+    DWORD minorVersion = (DWORD)(HIBYTE(LOWORD(version)));
+
+    DWORD build = 0;
+    if (version < 0x80000000) {
+        build = (DWORD)(HIWORD(version));
+    }
+
+    printf("Running Windows version %d.%d (%d).\n", majorVersion, minorVersion, build);
+    return 0;
+}