Add bazel 8 compatibility

README.md

@@ -27,6 +27,10 @@ You'll need [Bazel >= 6.0][bazel-getting-started] installed.
 
 If you are on NixOS, skip to the [Nixpkgs](#Nixpkgs) section.
 
+> [!NOTE]
+> Bazel 8 users will need to add
+> `common --noincompatible_disallow_ctx_resolve_tools` to `.bazelrc`
+
 ### System dependencies
 
 Refer to the "Before you begin" section in [the documentation](docs/haskell.rst).

haskell/cabal.bzl

@@ -4,7 +4,6 @@ load("@bazel_skylib//lib:dicts.bzl", "dicts")
 load("@bazel_skylib//lib:paths.bzl", "paths")
 load("@bazel_skylib//lib:sets.bzl", "sets")
 load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe", "read_netrc", "use_netrc")
-load("@bazel_tools//tools/cpp:lib_cc_configure.bzl", "get_cpu_value")
 load("@rules_cc//cc:find_cc_toolchain.bzl", "find_cc_toolchain", "use_cc_toolchain")
 load(":cc.bzl", "cc_interop_info", "ghc_cc_program_args")
 load(":haddock.bzl", "generate_unified_haddock_info")
@@ -20,6 +19,7 @@ load(
 load(":private/context.bzl", "haskell_context")
 load(":private/dependencies.bzl", "gather_dep_info")
 load(":private/expansions.bzl", "expand_make_variables")
+load(":private/get_cpu_value.bzl", "get_cpu_value")
 load(":private/mode.bzl", "is_profiling_enabled")
 load(
     ":private/path_utils.bzl",

haskell/ghc_bindist.bzl

@@ -2,11 +2,11 @@
 
 load("@bazel_skylib//lib:paths.bzl", "paths")
 load("@bazel_tools//tools/build_defs/repo:utils.bzl", "patch")
-load("@bazel_tools//tools/cpp:lib_cc_configure.bzl", "get_cpu_value")
 load("@rules_cc//cc:find_cc_toolchain.bzl", "CC_TOOLCHAIN_TYPE")
 load("@rules_sh//sh:posix.bzl", "sh_posix_configure")
 load("//haskell:ghc.bzl", "DEFAULT_GHC_VERSION")
 load(":private/bazel_platforms.bzl", "bazel_platforms")
+load(":private/get_cpu_value.bzl", "get_cpu_value")
 load(
     ":private/pkgdb_to_bzl.bzl",
     "pkgdb_to_bzl",
@@ -628,10 +628,7 @@ def _configure_python3_toolchain_impl(repository_ctx):
     else:
         stub_shebang = ""
     repository_ctx.file("BUILD.bazel", executable = False, content = """
-load(
-    "@bazel_tools//tools/python:toolchain.bzl",
-    "py_runtime_pair",
-)
+load("@rules_python//python:py_runtime_pair.bzl", "py_runtime_pair")
 py_runtime(
     name = "python3_runtime",
     interpreter_path = "{python3}",

haskell/private/get_cpu_value.bzl

@@ -0,0 +1,40 @@
+# Bazel 8 fix
+# Links:
+# - https://github.com/tweag/rules_sh/blob/4524d11e15bea61c0f6841cbc3ae0bc9c09835d8/sh/private/get_cpu_value.bzl#L4
+# - https://github.com/bazelbuild/rules_cc/blob/8395ec0172270f3bf92cd7b06c9b5b3f1f679e88/cc/private/toolchain/lib_cc_configure.bzl#L225
+def get_cpu_value(repository_ctx):
+    """Compute the cpu_value based on the OS name. Doesn't %-escape the result!
+
+    Args:
+      repository_ctx: The repository context.
+    Returns:
+      One of (darwin, freebsd, x64_windows, ppc, s390x, arm, aarch64, k8, piii)
+    """
+    os_name = repository_ctx.os.name
+    arch = repository_ctx.os.arch
+    if os_name.startswith("mac os"):
+        # Check if we are on x86_64 or arm64 and return the corresponding cpu value.
+        return "darwin_" + ("arm64" if arch == "aarch64" else "x86_64")
+    if os_name.find("freebsd") != -1:
+        return "freebsd"
+    if os_name.find("openbsd") != -1:
+        return "openbsd"
+    if os_name.find("windows") != -1:
+        if arch == "aarch64":
+            return "arm64_windows"
+        else:
+            return "x64_windows"
+
+    if arch in ["power", "ppc64le", "ppc", "ppc64"]:
+        return "ppc"
+    if arch in ["s390x"]:
+        return "s390x"
+    if arch in ["mips64"]:
+        return "mips64"
+    if arch in ["riscv64"]:
+        return "riscv64"
+    if arch in ["arm", "armv7l"]:
+        return "arm"
+    if arch in ["aarch64"]:
+        return "aarch64"
+    return "k8" if arch in ["amd64", "x86_64", "x64"] else "piii"

tools/os_info.bzl

@@ -1,4 +1,4 @@
-load("@bazel_tools//tools/cpp:lib_cc_configure.bzl", "get_cpu_value")
+load("//haskell:private/get_cpu_value.bzl", "get_cpu_value")
 
 _os_info_bzl_template = """
 cpu_value = "{CPU_VALUE}"