From: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Date: Sun, 23 Aug 2026 13:55:24 -0400
Subject: Bug 1974813, Bug 1965053 - abseil-cpp compiler flag adjustments in
 absl.gni.

Drops the prevent_unsafe_narrowing config, which chromium/build now includes
automatically, and silences -Wcomma and -Wtautological-type-limit-compare.
Those fire on deliberate comma expressions and on portability range checks that
are tautological only on 64-bit; abseil does not enable either warning.
---
 abseil-cpp/absl.gni | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/abseil-cpp/absl.gni b/abseil-cpp/absl.gni
index 3632789e941..8cb6e8b61d4 100644
--- a/abseil-cpp/absl.gni
+++ b/abseil-cpp/absl.gni
@@ -38,6 +38,20 @@ template("absl_source_set") {
         "//abseil-cpp:absl_define_config",
       ]
 
+      if (moz_webrtc_build) {
+        configs -= [ "//chromium/build/config/compiler:prevent_unsafe_narrowing" ]
+
+        # Silence -Wcomma / -Wtautological-type-limit-compare spam from
+        # third-party abseil sources. See bug 1965053.
+        if (!defined(cflags_cc)) {
+          cflags_cc = []
+        }
+        cflags_cc += [
+          "-Wno-comma",
+          "-Wno-tautological-type-limit-compare",
+        ]
+      }
+
       if (!defined(defines)) {
         defines = []
       }