SERVER-95993 suppress -Winterference-size (#29519)

GitOrigin-RevId: e2b28e4bb6dabc95947eb1b48bb663e45af30777

.clang-tidy.in

@@ -111,6 +111,7 @@ Checks:          '-*,
                   -cert-err60-cpp,
                   -cert-flp30-c,
                   -clang-diagnostic-builtin-macro-redefined,
+                  -clang-diagnostic-unknown-warning-option,
                   -cppcoreguidelines-avoid-goto,
                   -cppcoreguidelines-c-copy-assignment-signature,
                   -cppcoreguidelines-interfaces-global-init,

SConstruct

@@ -3905,6 +3905,10 @@ def doConfigure(myenv):
         # TODO SERVER-58675 - Remove this suppression after abseil is upgraded
         myenv.AddToCXXFLAGSIfSupported("-Wno-deprecated-builtins")
 
+        # We do not define an ABI that must be stable from build to build, so inconsistent hardware
+        # interference sizes between builds does not affect correctness.
+        myenv.AddToCXXFLAGSIfSupported("-Wno-interference-size")
+
         # Check if we can set "-Wnon-virtual-dtor" when "-Werror" is set. The only time we can't set it is on
         # clang 3.4, where a class with virtual function(s) and a non-virtual destructor throws a warning when
         # it shouldn't.

bazel/toolchains/mongo_cc_toolchain_config.bzl

@@ -711,6 +711,19 @@ def _impl(ctx):
         ],
     )
 
+    # We do not define an ABI that must be stable from build to build, so inconsistent hardware
+    # interference sizes between builds does not affect correctness.
+    no_interference_size_warning_feature = feature(
+        name = "no_interference_size_warning",
+        enabled = True,
+        flag_sets = [
+            flag_set(
+                actions = all_cpp_compile_actions,
+                flag_groups = [flag_group(flags = ["-Wno-interference-size"])],
+            ),
+        ],
+    )
+
     features = [
         bin_dirs_feature,
         default_compile_flags_feature,
@@ -751,6 +764,7 @@ def _impl(ctx):
         pessimizing_move_warning_feature,
         no_invalid_offsetof_warning_feature,
         no_class_memaccess_warning_feature,
+        no_interference_size_warning_feature,
     ]
 
     return [