Update Clang toolchain used by Bazel (#2151)

* Update Clang toolchain used by Bazel

* <time.h> include

* Sort includes

* Use libc timeval definition

* Disable unwinder linking for now

* Link libm

Author: petrhosek

MODULE.bazel

@@ -54,34 +54,34 @@ http_archive(
 http_archive(
     name = "clang_linux-x86_64",
     build_file = "//bazel/toolchain:clang.BUILD",
-    sha256 = "6c599d1aba568236064c340d7813324849896d5a4e2f3fd8225a8c31bfcbf884",
+    sha256 = "dd4b3b0fc7186a4da2b52796b251e0757aefac4813f9f635982954fec3337d2e",
     type = "zip",
-    url = "https://chrome-infra-packages.appspot.com/dl/fuchsia/third_party/clang/linux-amd64/+/git_revision:2b0a708f41dd6291ee744704d43febc975e3d026",
+    url = "https://chrome-infra-packages.appspot.com/dl/fuchsia/third_party/clang/linux-amd64/+/git_revision:9d3f9f47e6e630b8308562297757e0911be03a18",
 )
 
 http_archive(
     name = "clang_win-x86_64",
     build_file = "//bazel/toolchain:clang.BUILD",
-    sha256 = "f49ba4123ee3958f2b47289d017a5b3f1ca01f82dd7a2168c45412c18101fd13",
+    sha256 = "21092395df915ee5a899a832a592b137c9ea07fbc91e49ac6069ea0083d31899",
     type = "zip",
     # Windows doesn't like `:` in the produced filename, so replace it with `%3A`.
-    url = "https://chrome-infra-packages.appspot.com/dl/fuchsia/third_party/clang/windows-amd64/+/git_revision:2b0a708f41dd6291ee744704d43febc975e3d026".replace("git_revision:", "git_revision%3A"),
+    url = "https://chrome-infra-packages.appspot.com/dl/fuchsia/third_party/clang/windows-amd64/+/git_revision:9d3f9f47e6e630b8308562297757e0911be03a18".replace("git_revision:", "git_revision%3A"),
 )
 
 http_archive(
     name = "clang_mac-x86_64",
     build_file = "//bazel/toolchain:clang.BUILD",
-    sha256 = "d3516f2eb4c12d17ae77ee84c9226fbea581d4fb806910ceac4717d5adfcf748",
+    sha256 = "bb397fdce21d068ea40fefa9618993baa4907a248f996f18316c8fa6ca24dee2",
     type = "zip",
-    url = "https://chrome-infra-packages.appspot.com/dl/fuchsia/third_party/clang/mac-amd64/+/git_revision:2b0a708f41dd6291ee744704d43febc975e3d026",
+    url = "https://chrome-infra-packages.appspot.com/dl/fuchsia/third_party/clang/mac-amd64/+/git_revision:9d3f9f47e6e630b8308562297757e0911be03a18",
 )
 
 http_archive(
     name = "clang_mac-aarch64",
     build_file = "//bazel/toolchain:clang.BUILD",
-    sha256 = "68e551f41c7e9473063b09819f6ab8ec6e7e53677f4078189656cb14dc52984b",
+    sha256 = "dad5583f96eabc913c1930d923c53a105d6ed73f56ca32451ea79ad70e495b0f",
     type = "zip",
-    url = "https://chrome-infra-packages.appspot.com/dl/fuchsia/third_party/clang/mac-arm64/+/git_revision:2b0a708f41dd6291ee744704d43febc975e3d026",
+    url = "https://chrome-infra-packages.appspot.com/dl/fuchsia/third_party/clang/mac-arm64/+/git_revision:9d3f9f47e6e630b8308562297757e0911be03a18",
 )
 
 new_git_repository = use_repo_rule("@bazel_tools//tools/build_defs/repo:git.bzl", "new_git_repository")

bazel/toolchain/BUILD.bazel

@@ -79,9 +79,11 @@ cc_args(
     name = "llvm-libc_args",
     actions = ["@rules_cc//cc/toolchains/actions:link_actions"],
     args = [
+        "--unwindlib=none",
         "-nostdlib++",
         "-nostartfiles",
         "-Wl,-lc++",
+        "-Wl,-lm",
     ],
     visibility = ["//visibility:private"],
 )

src/rp2_common/pico_clib_interface/include/llvm_libc/sys/time.h

@@ -9,15 +9,7 @@
 
 #include <__llvm-libc-common.h>
 
-#include <llvm-libc-types/time_t.h>
-#include <llvm-libc-types/struct_timespec.h>
-
-typedef long suseconds_t;
-
-struct timeval {
-  time_t tv_sec;
-  suseconds_t tv_usec;
-};
+#include <llvm-libc-types/struct_timeval.h>
 
 struct timezone {
   int tz_minuteswest;

src/rp2_common/pico_clib_interface/llvm_libc_interface.c

@@ -5,8 +5,10 @@
  */
 
 #include <math.h>
+#include <stdbool.h>
 #include <stddef.h>
 #include <sys/time.h>
+#include <time.h>
 
 #include <llvm-libc-types/ssize_t.h>
 
@@ -65,6 +67,13 @@ ssize_t __llvm_libc_stdio_write(__unused void *cookie, const char *buf, size_t s
     return size;
 }
 
+bool __llvm_libc_timespec_get_utc(struct timespec *ts) {
+    int64_t absolute_time = (int64_t)get_absolute_time();
+    ts->tv_sec = (time_t)(absolute_time / 1000000);
+    ts->tv_nsec = (long)(absolute_time % 1000000 * 1000);
+    return true;
+}
+
 void __cxa_finalize(__unused void *dso) {}
 
 void __attribute__((noreturn)) __llvm_libc_exit(__unused int status) {