Provide clang 20.1.7 toolchain [AP-4010]

cc/constraints/BUILD.bazel

@@ -14,6 +14,11 @@ constraint_value(
     constraint_setting = ":toolchain",
 )
 
+constraint_value(
+    name = "llvm20_toolchain",
+    constraint_setting = ":toolchain",
+)
+
 constraint_value(
     name = "yocto_generic_toolchain",
     constraint_setting = ":toolchain",

cc/repositories.bzl

@@ -20,6 +20,15 @@ AARCH64_LINUX_LLVM = "https://github.com/llvm/llvm-project/releases/download/llv
 
 X86_64_LINUX_LLVM = "https://github.com/llvm/llvm-project/releases/download/llvmorg-14.0.0/clang%2Bllvm-14.0.0-x86_64-linux-gnu-ubuntu-18.04.tar.xz"
 
+# LLVM 20.1.7 URLs
+AARCH64_DARWIN_LLVM20 = "https://github.com/llvm/llvm-project/releases/download/llvmorg-20.1.7/LLVM-20.1.7-macOS-ARM64.tar.xz"
+
+X86_64_DARWIN_LLVM20 = "https://github.com/llvm/llvm-project/releases/download/llvmorg-20.1.7/LLVM-20.1.7-macOS-X64.tar.xz"
+
+AARCH64_LINUX_LLVM20 = "https://github.com/llvm/llvm-project/releases/download/llvmorg-20.1.7/LLVM-20.1.7-Linux-ARM64.tar.xz"
+
+X86_64_LINUX_LLVM20 = "https://github.com/llvm/llvm-project/releases/download/llvmorg-20.1.7/LLVM-20.1.7-Linux-X64.tar.xz"
+
 X86_64_LINUX_UCRT_LLVM_MINGW = "https://github.com/mstorsjo/llvm-mingw/releases/download/20241203/llvm-mingw-20241203-ucrt-ubuntu-20.04-x86_64.tar.xz"
 
 AARCH64_LINUX_MUSL = "https://github.com/swift-nav/swift-toolchains/releases/download/musl-cross-11.2.0/aarch64-linux-musl-cross.tar.gz"
@@ -85,6 +94,44 @@ def swift_cc_toolchain():
         sha256 = "61582215dafafb7b576ea30cc136be92c877ba1f1c31ddbbd372d6d65622fef5",
     )
 
+def swift_cc_toolchain_llvm20():
+    """Define LLVM 20.1.7 toolchain repositories."""
+    maybe(
+        http_archive,
+        name = "aarch64-darwin-llvm20",
+        build_file = Label("@rules_swiftnav//cc/toolchains/llvm20:llvm.BUILD.bzl"),
+        url = AARCH64_DARWIN_LLVM20,
+        strip_prefix = "LLVM-20.1.7-macOS-ARM64",
+        # TODO: Add sha256 hash for integrity
+    )
+
+    maybe(
+        http_archive,
+        name = "x86_64-darwin-llvm20",
+        build_file = Label("@rules_swiftnav//cc/toolchains/llvm20:llvm.BUILD.bzl"),
+        url = X86_64_DARWIN_LLVM20,
+        strip_prefix = "LLVM-20.1.7-macOS-X64",
+        # TODO: Add sha256 hash for integrity
+    )
+
+    maybe(
+        http_archive,
+        name = "aarch64-linux-llvm20",
+        build_file = Label("@rules_swiftnav//cc/toolchains/llvm20:llvm.BUILD.bzl"),
+        url = AARCH64_LINUX_LLVM20,
+        strip_prefix = "LLVM-20.1.7-Linux-ARM64",
+        # TODO: Add sha256 hash for integrity
+    )
+
+    maybe(
+        http_archive,
+        name = "x86_64-linux-llvm20",
+        build_file = Label("@rules_swiftnav//cc/toolchains/llvm20:llvm.BUILD.bzl"),
+        url = X86_64_LINUX_LLVM20,
+        strip_prefix = "LLVM-20.1.7-Linux-X64",
+        # TODO: Add sha256 hash for integrity
+    )
+
 def aarch64_sysroot():
     maybe(
         http_archive,
@@ -124,6 +171,13 @@ def register_swift_cc_toolchains():
     native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm/x86_64-aarch64-linux:cc-toolchain-aarch64-bullseye-graviton2")
     native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm/x86_64-aarch64-linux:cc-toolchain-aarch64-bullseye-graviton3")
 
+def register_swift_cc_toolchains_llvm20():
+    """Register LLVM 20.1.7 toolchains."""
+    native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm20/aarch64-darwin:cc-toolchain-aarch64-darwin")
+    native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm20/x86_64-darwin:cc-toolchain-x86_64-darwin")
+    native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm20/aarch64-linux:cc-toolchain-aarch64-linux")
+    native.register_toolchains("@rules_swiftnav//cc/toolchains/llvm20/x86_64-linux:cc-toolchain-x86_64-linux")
+
 def aarch64_linux_musl_toolchain():
     http_archive(
         name = "aarch64-linux-musl",

cc/toolchains/llvm20/BUILD.bazel

@@ -0,0 +1,11 @@
+# Copyright (C) 2022 Swift Navigation Inc.
+# Contact: Swift Navigation <[email protected]>
+#
+# This source is subject to the license found in the file 'LICENSE' which must
+# be be distributed together with this source. All other rights reserved.
+#
+# THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+# EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
+
+package(default_visibility = ["//visibility:public"])

cc/toolchains/llvm20/aarch64-darwin/BUILD.bazel

@@ -0,0 +1,152 @@
+# Copyright (C) 2022 Swift Navigation Inc.
+# Contact: Swift Navigation <[email protected]>
+#
+# This source is subject to the license found in the file 'LICENSE' which must
+# be be distributed together with this source. All other rights reserved.
+#
+# THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+# EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
+
+load("@rules_swiftnav//cc/toolchains/llvm20:cc_toolchain_config.bzl", "cc_toolchain_config")
+load("@rules_swiftnav//cc/toolchains/llvm20:target_triplets.bzl", "AARCH64_DARWIN")
+
+package(default_visibility = ["//visibility:public"])
+
+filegroup(
+    name = "wrappers",
+    srcs = glob([
+        "wrappers/**",
+    ]),
+    visibility = ["//visibility:public"],
+)
+
+filegroup(
+    name = "ar_files",
+    srcs = [
+        ":wrappers",
+        "@aarch64-darwin-llvm20//:ar",
+    ],
+)
+
+filegroup(
+    name = "as_files",
+    srcs = [
+        ":wrappers",
+        "@aarch64-darwin-llvm20//:as",
+    ],
+)
+
+filegroup(
+    name = "compiler_files",
+    srcs = [
+        ":wrappers",
+        "@aarch64-darwin-llvm20//:clang",
+        "@aarch64-darwin-llvm20//:include",
+    ],
+)
+
+filegroup(
+    name = "dwp_files",
+    srcs = [
+        ":wrappers",
+        "@aarch64-darwin-llvm20//:dwp",
+    ],
+)
+
+filegroup(
+    name = "linker_files",
+    srcs = [
+        ":wrappers",
+        "@aarch64-darwin-llvm20//:ar",
+        "@aarch64-darwin-llvm20//:clang",
+        "@aarch64-darwin-llvm20//:lib",
+    ],
+)
+
+filegroup(
+    name = "objcopy_files",
+    srcs = [
+        ":wrappers",
+        "@aarch64-darwin-llvm20//:objcopy",
+    ],
+)
+
+filegroup(
+    name = "strip_files",
+    srcs = [
+        ":wrappers",
+        "@aarch64-darwin-llvm20//:strip",
+    ],
+)
+
+filegroup(
+    name = "all_files",
+    srcs = [
+        "linker_files",
+        ":compiler_files",
+        "@aarch64-darwin-llvm20//:bin",
+    ],
+)
+
+cc_toolchain_config(
+    name = "local-aarch64-darwin",
+    abi_libc_version = "darwin_aarch64",
+    abi_version = "darwin_aarch64",
+    builtin_sysroot = "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk",
+    compiler = "clang",
+    cxx_builtin_include_directories = [
+        "%sysroot%/usr/include",
+        "%sysroot%/System/Library/Frameworks",
+    ],
+    host_system_name = AARCH64_DARWIN,
+    is_darwin = True,
+    target_cpu = "darwin",
+    target_libc = "macosx",
+    target_system_name = AARCH64_DARWIN,
+    tool_paths = {
+        "ar": "/usr/bin/libtool",
+        "cpp": "wrappers/clang-cpp",
+        "gcc": "wrappers/clang",
+        "gcov": "wrappers/llvm-profdata",
+        "llvm-cov": "wrappers/llvm-cov",
+        "llvm-profdata": "wrappers/llvm-profdata",
+        "ld": "/usr/bin/ld",
+        "nm": "wrappers/llvm-nm",
+        "objcopy": "wrappers/llvm-objcopy",
+        "objdump": "wrappers/llvm-objdump",
+        "strip": "wrappers/llvm-strip",
+    },
+    toolchain_identifier = "clang-aarch64-darwin",
+    toolchain_path_prefix = "external/aarch64-darwin-llvm20",
+    use_lld = False,
+)
+
+cc_toolchain(
+    name = "cc-clang-aarch64-darwin",
+    all_files = ":all_files",
+    ar_files = ":ar_files",
+    as_files = ":as_files",
+    compiler_files = ":compiler_files",
+    dwp_files = ":dwp_files",
+    linker_files = ":linker_files",
+    objcopy_files = ":objcopy_files",
+    strip_files = ":strip_files",
+    toolchain_config = ":local-aarch64-darwin",
+)
+
+toolchain(
+    name = "cc-toolchain-aarch64-darwin",
+    exec_compatible_with = [
+        "@platforms//cpu:aarch64",
+        "@platforms//os:macos",
+    ],
+    target_compatible_with = [
+        "@platforms//cpu:aarch64",
+        "@platforms//os:macos",
+        "@rules_swiftnav//cc/constraints:llvm20_toolchain",
+    ],
+    target_settings = None,
+    toolchain = ":cc-clang-aarch64-darwin",
+    toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",
+)

cc/toolchains/llvm20/aarch64-darwin/wrappers/clang

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2022 Swift Navigation Inc.
+# Contact: Swift Navigation <[email protected]>
+#
+# This source is subject to the license found in the file 'LICENSE' which must
+# be be distributed together with this source. All other rights reserved.
+#
+# THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+# EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
+
+# Locates the actual tool paths relative to the location this script is
+# executed from.
+#
+# This is necessary because we download the toolchain using
+# http_archive, which bazel places in _execroot_/external/_repo_name_.
+#
+# Unfortunately we cannot provide this location as the argument of tool_path
+# when configuring the toolchain, because tool_path only takes a relative path.
+#
+# This is the fairly common workaround to handle this.
+#
+# TODO: [BUILD-549] - Remove need for wrapper files
+#
+# Recent versions of Bazel may have introduced a mechanism that removes
+# the need for this workaround: https://github.com/bazelbuild/bazel/issues/7746
+
+set -e
+
+# Use --actionv_env=SWIFTNAV_VERBOSE_TOOLCHAIN to enable
+if [[ -n "$SWIFTNAV_VERBOSE_TOOLCHAIN" ]]; then
+  set -x
+fi
+
+tool_name=$(basename "${BASH_SOURCE[0]}")
+# In case the tool label is changed, a change in here is very likely needed
+# This establishes backwards compatibility with the old WORKSPACE file
+toolchain_bindir=external/aarch64-darwin-llvm20/bin
+toolchain_bindir_as_bzlmod=external/rules_swiftnav~~swift_cc_toolchain_extension~aarch64-darwin-llvm20/bin
+
+if [[ -f "${toolchain_bindir}"/"${tool_name}" ]]; then
+  # We're running under _execroot_, call the real tool.
+  exec "${toolchain_bindir}"/"${tool_name}" "$@"
+elif [[ -f "${toolchain_bindir_as_bzlmod}"/"${tool_name}" ]]; then
+  # We're running under _execroot_, call the real tool.
+  exec "${toolchain_bindir_as_bzlmod}"/"${tool_name}" "$@"
+elif [[ "${BASH_SOURCE[0]}" == "/"* ]]; then
+  # This branch exists because some users of the toolchain,
+  # namely rules_foreign_cc, will change CWD and call $CC (this script)
+  # with its absolute path.
+  #
+  # To deal with this we find the tool relative to this script, which is at
+  # _execroot_/external/rules_swiftnav/cc/toolchain/llvm/x86_64-linux/wrappers/wrapper.
+  #
+  # If the wrapper is relocated then this line needs to be adjusted.
+  execroot_path="${BASH_SOURCE[0]%/*/*/*/*/*/*/*/*}"
+  tool="${execroot_path}/${toolchain_bindir}/${tool_name}"
+  exec "${tool}" "${@}"
+else
+  >&2 echo "ERROR: could not find ${tool_name}; PWD=\"$(pwd)\"; PATH=\"${PATH}\"."
+  exit 5
+fi
+

cc/toolchains/llvm20/aarch64-darwin/wrappers/clang-cpp

@@ -0,0 +1,64 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2022 Swift Navigation Inc.
+# Contact: Swift Navigation <[email protected]>
+#
+# This source is subject to the license found in the file 'LICENSE' which must
+# be be distributed together with this source. All other rights reserved.
+#
+# THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+# EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
+
+# Locates the actual tool paths relative to the location this script is
+# executed from.
+#
+# This is necessary because we download the toolchain using
+# http_archive, which bazel places in _execroot_/external/_repo_name_.
+#
+# Unfortunately we cannot provide this location as the argument of tool_path
+# when configuring the toolchain, because tool_path only takes a relative path.
+#
+# This is the fairly common workaround to handle this.
+#
+# TODO: [BUILD-549] - Remove need for wrapper files
+#
+# Recent versions of Bazel may have introduced a mechanism that removes
+# the need for this workaround: https://github.com/bazelbuild/bazel/issues/7746
+
+set -e
+
+# Use --actionv_env=SWIFTNAV_VERBOSE_TOOLCHAIN to enable
+if [[ -n "$SWIFTNAV_VERBOSE_TOOLCHAIN" ]]; then
+  set -x
+fi
+
+tool_name=$(basename "${BASH_SOURCE[0]}")
+# In case the tool label is changed, a change in here is very likely needed
+# This establishes backwards compatibility with the old WORKSPACE file
+toolchain_bindir=external/aarch64-darwin-llvm20/bin
+toolchain_bindir_as_bzlmod=external/rules_swiftnav~~swift_cc_toolchain_extension~aarch64-darwin-llvm20/bin
+
+if [[ -f "${toolchain_bindir}"/"${tool_name}" ]]; then
+  # We're running under _execroot_, call the real tool.
+  exec "${toolchain_bindir}"/"${tool_name}" "$@"
+elif [[ -f "${toolchain_bindir_as_bzlmod}"/"${tool_name}" ]]; then
+  # We're running under _execroot_, call the real tool.
+  exec "${toolchain_bindir_as_bzlmod}"/"${tool_name}" "$@"
+elif [[ "${BASH_SOURCE[0]}" == "/"* ]]; then
+  # This branch exists because some users of the toolchain,
+  # namely rules_foreign_cc, will change CWD and call $CC (this script)
+  # with its absolute path.
+  #
+  # To deal with this we find the tool relative to this script, which is at
+  # _execroot_/external/rules_swiftnav/cc/toolchain/llvm/x86_64-linux/wrappers/wrapper.
+  #
+  # If the wrapper is relocated then this line needs to be adjusted.
+  execroot_path="${BASH_SOURCE[0]%/*/*/*/*/*/*/*/*}"
+  tool="${execroot_path}/${toolchain_bindir}/${tool_name}"
+  exec "${tool}" "${@}"
+else
+  >&2 echo "ERROR: could not find ${tool_name}; PWD=\"$(pwd)\"; PATH=\"${PATH}\"."
+  exit 5
+fi
+