CHANGELOG.md

+# [1.2.0](https://git.gitlab.arm.com/bazel/toolchain_utils/compare/v1.1.0...v1.2.0) (2025-02-18)
+
+### Features
+
+- add `cygwin` C library constraint ([fea66a1](https://git.gitlab.arm.com/bazel/toolchain_utils/commit/fea66a1ad5f6ce28f41e1c8d1338dc3658dbb0ac))
+- export `TOOLCHAIN_{COU,TRI}PLETS` ([2a2baae](https://git.gitlab.arm.com/bazel/toolchain_utils/commit/2a2baae88ca5b98ef255f89e58eb8020cb202832))
+
 # [1.1.0](https://git.gitlab.arm.com/bazel/toolchain_utils/compare/v1.0.2...v1.1.0) (2025-02-17)
 
 ### Bug Fixes

MODULE.bazel

 module(
     name = "toolchain_utils",
-    version = "1.1.0",
+    version = "1.2.0",
     bazel_compatibility = [
         ">=7.1.0",
     ],

e2e/constraint/BUILD.bazel

+load("@toolchain_utils//toolchain:defs.bzl", "TOOLCHAIN_COUPLETS", "TOOLCHAIN_TRIPLETS")
+load("@bazel_skylib//rules:build_test.bzl", "build_test")
+
+build_test(
+    name = "couplets",
+    size = "small",
+    targets = ["@toolchain_utils//toolchain/constraint:{}".format(t.value) for t in TOOLCHAIN_COUPLETS],
+)
+
+build_test(
+    name = "triplets",
+    size = "small",
+    targets = ["@toolchain_utils//toolchain/constraint:{}".format(t.value) for t in TOOLCHAIN_TRIPLETS],
+)

e2e/platform/BUILD.bazel

+load("@toolchain_utils//toolchain:defs.bzl", "TOOLCHAIN_COUPLETS", "TOOLCHAIN_TRIPLETS")
+load("@bazel_skylib//rules:build_test.bzl", "build_test")
+
+build_test(
+    name = "couplets",
+    size = "small",
+    targets = ["@toolchain_utils//toolchain/platform:{}".format(t.value) for t in TOOLCHAIN_COUPLETS],
+)
+
+build_test(
+    name = "triplets",
+    size = "small",
+    targets = ["@toolchain_utils//toolchain/platform:{}".format(t.value) for t in TOOLCHAIN_TRIPLETS],
+)

toolchain/constraint/libc/BUILD.bazel

@@ -38,3 +38,9 @@ constraint_value(
     constraint_setting = ":libc",
     visibility = ["//visibility:public"],
 )
+
+constraint_value(
+    name = "cygwin",
+    constraint_setting = ":libc",
+    visibility = ["//visibility:public"],
+)

toolchain/constraint/libc/cygwin/BUILD.bazel

+load(":versions.bzl", "VERSIONS")
+
+constraint_setting(
+    name = "cygwin",
+    visibility = ["//visibility:public"],
+)
+
+[
+    constraint_value(
+        name = version,
+        constraint_setting = ":cygwin",
+        visibility = ["//visibility:public"],
+    )
+    for version in VERSIONS
+]

toolchain/constraint/libc/cygwin/versions.bzl

+load("@local//:triplet.bzl", "TRIPLET")
+
+visibility("//toolchain/...")
+
+LOCAL = TRIPLET.libc.version and TRIPLET.libc.version.value
+
+# TODO: figure out a way to generate Cygwin versions
+
+VERSIONS = tuple([LOCAL] if LOCAL != None else [])

toolchain/defs.bzl

+load("//toolchain/couplet:couplets.bzl", _COUPLETS = "COUPLETS")
+load("//toolchain/triplet:triplets.bzl", _TRIPLETS = "TRIPLETS")
+
+visibility("public")
+
+TOOLCHAIN_COUPLETS = _COUPLETS
+TOOLCHAIN_TRIPLETS = _TRIPLETS