From 665ac5b425cea2462bf85dcbb56dd68ec19ad00f Mon Sep 17 00:00:00 2001
From: Oleg Fatkhiev <41271510+ofats@users.noreply.github.com>
Date: Wed, 1 Sep 2021 21:48:37 +0100
Subject: Add -Wno-unknown-warning-option to ABSL_LLVM_FLAGS to disable
 warnings on unknown warning flags. (#1008)

---
 absl/copts/GENERATED_AbseilCopts.cmake | 1 +
 absl/copts/GENERATED_copts.bzl         | 1 +
 absl/copts/copts.py                    | 3 +++
 3 files changed, 5 insertions(+)

diff --git a/absl/copts/GENERATED_AbseilCopts.cmake b/absl/copts/GENERATED_AbseilCopts.cmake
index 22a25eba..a4ab1aa2 100644
--- a/absl/copts/GENERATED_AbseilCopts.cmake
+++ b/absl/copts/GENERATED_AbseilCopts.cmake
@@ -94,6 +94,7 @@ list(APPEND ABSL_LLVM_FLAGS
     "-Wno-implicit-int-conversion"
     "-Wno-shorten-64-to-32"
     "-Wno-sign-conversion"
+    "-Wno-unknown-warning-option"
     "-DNOMINMAX"
 )
 
diff --git a/absl/copts/GENERATED_copts.bzl b/absl/copts/GENERATED_copts.bzl
index 0c7a91bd..a6efc98e 100644
--- a/absl/copts/GENERATED_copts.bzl
+++ b/absl/copts/GENERATED_copts.bzl
@@ -95,6 +95,7 @@ ABSL_LLVM_FLAGS = [
     "-Wno-implicit-int-conversion",
     "-Wno-shorten-64-to-32",
     "-Wno-sign-conversion",
+    "-Wno-unknown-warning-option",
     "-DNOMINMAX",
 ]
 
diff --git a/absl/copts/copts.py b/absl/copts/copts.py
index 7268c680..0d6c1ec3 100644
--- a/absl/copts/copts.py
+++ b/absl/copts/copts.py
@@ -112,6 +112,9 @@ COPT_VARS = {
         "-Wno-implicit-int-conversion",
         "-Wno-shorten-64-to-32",
         "-Wno-sign-conversion",
+        # Disable warnings on unknown warning flags (when warning flags are
+        # unknown on older compiler versions)
+        "-Wno-unknown-warning-option",
         # Don't define min and max macros (Build on Windows using clang)
         "-DNOMINMAX",
     ],
-- 
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