Update CI to a more recent Clang on Linux x86-64

/opt/llvm/clang/bin/clang -v
clang version 21.0.0git (https://github.com/llvm/llvm-project 2dee1a2de3d2cc774fbd43507cf4320418fbf279)

This change adds `-Wno-unused-command-line-argument`
to the Clang builds since Bazel is now providing an unused
`-c` to rules that do header syntax checking only.
Rules that were missing copts which causes them to
encounter this error are also fixed.

PiperOrigin-RevId: 764757573
Change-Id: I1eba676327a6023c5b8afb54499e4a3a72c2cdad

absl/base/BUILD.bazel

@@ -719,6 +719,7 @@ cc_library(
     testonly = True,
     srcs = ["internal/scoped_set_env.cc"],
     hdrs = ["internal/scoped_set_env.h"],
+    copts = ABSL_DEFAULT_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     visibility = [
         "//absl:__subpackages__",

absl/copts/GENERATED_AbseilCopts.cmake

@@ -121,6 +121,7 @@ list(APPEND ABSL_LLVM_FLAGS
     "-Wno-implicit-float-conversion"
     "-Wno-implicit-int-float-conversion"
     "-Wno-unknown-warning-option"
+    "-Wno-unused-command-line-argument"
     "-DNOMINMAX"
 )
 
@@ -160,6 +161,7 @@ list(APPEND ABSL_LLVM_TEST_FLAGS
     "-Wno-implicit-float-conversion"
     "-Wno-implicit-int-float-conversion"
     "-Wno-unknown-warning-option"
+    "-Wno-unused-command-line-argument"
     "-DNOMINMAX"
     "-Wno-deprecated-declarations"
     "-Wno-implicit-int-conversion"

absl/copts/GENERATED_copts.bzl

@@ -122,6 +122,7 @@ ABSL_LLVM_FLAGS = [
     "-Wno-implicit-float-conversion",
     "-Wno-implicit-int-float-conversion",
     "-Wno-unknown-warning-option",
+    "-Wno-unused-command-line-argument",
     "-DNOMINMAX",
 ]
 
@@ -161,6 +162,7 @@ ABSL_LLVM_TEST_FLAGS = [
     "-Wno-implicit-float-conversion",
     "-Wno-implicit-int-float-conversion",
     "-Wno-unknown-warning-option",
+    "-Wno-unused-command-line-argument",
     "-DNOMINMAX",
     "-Wno-deprecated-declarations",
     "-Wno-implicit-int-conversion",

absl/copts/copts.py

@@ -84,6 +84,7 @@ ABSL_LLVM_FLAGS = [
     # Disable warnings on unknown warning flags (when warning flags are
     # unknown on older compiler versions)
     "-Wno-unknown-warning-option",
+    "-Wno-unused-command-line-argument",
     # Don't define min and max macros (Build on Windows using clang)
     "-DNOMINMAX",
 ]

absl/profiling/BUILD.bazel

@@ -49,6 +49,7 @@ cc_library(
 cc_test(
     name = "sample_recorder_test",
     srcs = ["internal/sample_recorder_test.cc"],
+    copts = ABSL_TEST_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     tags = [
         "no_test_wasm",
@@ -69,6 +70,7 @@ cc_library(
     name = "exponential_biased",
     srcs = ["internal/exponential_biased.cc"],
     hdrs = ["internal/exponential_biased.h"],
+    copts = ABSL_DEFAULT_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     visibility = [
         "//absl:__subpackages__",

absl/strings/BUILD.bazel

@@ -1462,6 +1462,7 @@ cc_library(
     testonly = True,
     srcs = ["internal/pow10_helper.cc"],
     hdrs = ["internal/pow10_helper.h"],
+    copts = ABSL_DEFAULT_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     visibility = ["//visibility:private"],
     deps = ["//absl/base:config"],

absl/strings/CMakeLists.txt

@@ -663,7 +663,7 @@ absl_cc_library(
   SRCS
     "internal/pow10_helper.cc"
   COPTS
-    ${ABSL_TEST_COPTS}
+    ${ABSL_DEFAULT_COPTS}
   DEPS
     absl::config
   TESTONLY

ci/linux_docker_containers.sh

@@ -16,7 +16,7 @@
 # Test scripts should source this file to get the identifiers.
 
 readonly LINUX_ALPINE_CONTAINER="gcr.io/google.com/absl-177019/alpine:20230612"
-readonly LINUX_CLANG_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_hybrid-latest:20250430"
+readonly LINUX_CLANG_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_hybrid-latest:20250527"
 readonly LINUX_ARM_CLANG_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_arm_hybrid-latest:20250430"
-readonly LINUX_GCC_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_hybrid-latest:20250430"
+readonly LINUX_GCC_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_hybrid-latest:20250527"
 readonly LINUX_GCC_FLOOR_CONTAINER="gcr.io/google.com/absl-177019/linux_gcc-floor:20250430"