pw_build: Provide HOST_PLATFORMS tuple

Allow other parts of the build to refer to "host platforms" consistently with host_backend_alias. This allows a module to, for example, set a a backend for the host and a default backend for non-host platforms. Change-Id: If04893aa83ea238503283119908b8f046cf0a431 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/260518 Pigweed-Auto-Submit: Wyatt Hepler <[email protected]> Commit-Queue: Auto-Submit <[email protected]> Presubmit-Verified: CQ Bot Account <[email protected]> Reviewed-by: Ted Pudlik <[email protected]> Docs-Not-Needed: Wyatt Hepler <[email protected]> Lint: Lint 🤖 <[email protected]>
google · Jan 15, 2025 · d178cae · d178cae
1 parent 5da0586
commit d178cae
Showing 1 changed file with 9 additions and 7 deletions.
diff --git a/pw_build/compatibility.bzl b/pw_build/compatibility.bzl
@@ -15,18 +15,20 @@
 
 load("@bazel_skylib//lib:selects.bzl", "selects")
 
+HOST_PLATFORMS = (
+    "@platforms//os:android",
+    "@platforms//os:chromiumos",
+    "@platforms//os:linux",
+    "@platforms//os:macos",
+    "@platforms//os:windows",
+)
+
 def host_backend_alias(name, backend):
     """An alias that resolves to the backend for host platforms."""
     native.alias(
         name = name,
         actual = selects.with_or({
-            (
-                "@platforms//os:android",
-                "@platforms//os:chromiumos",
-                "@platforms//os:linux",
-                "@platforms//os:macos",
-                "@platforms//os:windows",
-            ): backend,
+            HOST_PLATFORMS: backend,
             "//conditions:default": str(Label("//pw_build:unspecified_backend")),
         }),
     )