From e002cbb06ba53e2ffd3b2078d5198ec4f88918b9 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Tue, 1 Sep 2020 11:59:55 +0200
Subject: [PATCH] Build: Add some -Wno-unknown-warning-option flags to CXXFLAGS

Patch from Anonymous.
---
 CMakeLists.txt                | 2 +-
 Kernel/CMakeLists.txt         | 2 +-
 Libraries/LibC/CMakeLists.txt | 2 +-
 Meta/Lagom/CMakeLists.txt     | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3d3229ea4f8..8bb8a0f65ae 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,7 +40,7 @@ add_custom_target(check-style
     USES_TERMINAL
 )
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Werror -Wmissing-declarations -std=c++2a -fdiagnostics-color=always")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option -Wall -Wextra -Werror -Wmissing-declarations -std=c++2a -fdiagnostics-color=always")
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fconcepts")
 elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
diff --git a/Kernel/CMakeLists.txt b/Kernel/CMakeLists.txt
index c91da6c61f6..592d4b94302 100644
--- a/Kernel/CMakeLists.txt
+++ b/Kernel/CMakeLists.txt
@@ -239,7 +239,7 @@ set(SOURCES
     ${CRYPTO_SOURCES}
 )
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DKERNEL")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option -DKERNEL")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pie -fPIE -ffreestanding -fbuiltin")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mno-80387 -mno-mmx -mno-sse -mno-sse2")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-asynchronous-unwind-tables")
diff --git a/Libraries/LibC/CMakeLists.txt b/Libraries/LibC/CMakeLists.txt
index 28759735183..7d8960be663 100644
--- a/Libraries/LibC/CMakeLists.txt
+++ b/Libraries/LibC/CMakeLists.txt
@@ -52,7 +52,7 @@ file(GLOB AK_SOURCES "../../AK/*.cpp")
 file(GLOB ELF_SOURCES "../LibELF/*.cpp")
 set(ELF_SOURCES ${ELF_SOURCES} ../LibELF/Arch/i386/plt_trampoline.S)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DSERENITY_LIBC_BUILD")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option -DSERENITY_LIBC_BUILD")
 
 find_program(INSTALL_COMMAND ginstall)
 if(NOT INSTALL_COMMAND)
diff --git a/Meta/Lagom/CMakeLists.txt b/Meta/Lagom/CMakeLists.txt
index e02dd4ecdfc..c1d7633168f 100644
--- a/Meta/Lagom/CMakeLists.txt
+++ b/Meta/Lagom/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required (VERSION 3.0)
 project (Lagom)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2 -Wall -Wextra -Werror -std=c++2a -fPIC -g -Wno-deprecated-copy")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option -O2 -Wall -Wextra -Werror -std=c++2a -fPIC -g -Wno-deprecated-copy")
 
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wconsumed -Wno-overloaded-virtual")