use c++20 on webrtc builds (#162)

Author: theomonnom

webrtc-sys/libwebrtc/.gitignore

@@ -5,8 +5,8 @@ depot_tools
 ninja
 
 # builds
-win*
-mac*
-linux*
-android*
-ios*
+win-*
+mac-*
+linux-*
+android-*
+ios-*

webrtc-sys/libwebrtc/build_android.sh

@@ -98,8 +98,7 @@ args="is_debug=$debug \
   rtc_use_pipewire=false \
   symbol_level=0 \
   enable_iterator_debugging=false \
-  use_rtti=true \
-  use_cxx17=true"
+  use_rtti=true"
 
 if [ "$debug" = "true" ]; then
   args="${args} is_asan=true is_lsan=true";

webrtc-sys/libwebrtc/build_ios.sh

@@ -112,8 +112,7 @@ gn gen "$OUTPUT_DIR" --root="src" \
   use_custom_libcxx=false \
   clang_use_chrome_plugins=false \
   use_rtti=true \
-  use_lld=false \
-  use_cxx17=true"
+  use_lld=false"
 
 # build static library
 ninja -C "$OUTPUT_DIR" :default \

webrtc-sys/libwebrtc/build_linux.sh

@@ -99,8 +99,7 @@ args="is_debug=$debug  \
   symbol_level=0 \
   enable_iterator_debugging=false \
   use_rtti=true \
-  rtc_use_x11=false \
-  use_cxx17=true"
+  rtc_use_x11=false"
 
 if [ "$debug" = "true" ]; then
   args="${args} is_asan=true is_lsan=true";

webrtc-sys/libwebrtc/build_macos.sh

@@ -100,8 +100,7 @@ gn gen "$OUTPUT_DIR" --root="src" \
   use_custom_libcxx=false \
   clang_use_chrome_plugins=false \
   use_rtti=true \
-  use_lld=false \
-  use_cxx17=true"
+  use_lld=false"
 
 # build static library
 ninja -C "$OUTPUT_DIR" :default \

webrtc-sys/libwebrtc/build_windows.cmd

@@ -52,6 +52,7 @@ if not exist src (
 cd src
 call git apply "%COMMAND_DIR%/patches/add_licenses.patch" -v --ignore-space-change --ignore-whitespace --whitespace=nowarn
 call git apply "%COMMAND_DIR%/patches/add_deps.patch" -v --ignore-space-change --ignore-whitespace --whitespace=nowarn
+call git apply "%COMMAND_DIR%/patches/windows_silence_warnings.patch" -v --ignore-space-change --ignore-whitespace --whitespace=nowarn
 call git apply "%COMMAND_DIR%/patches/ssl_verify_callback_with_native_handle.patch" -v --ignore-space-change --ignore-whitespace --whitespace=nowarn
 cd ..
 
@@ -64,7 +65,7 @@ if "!profile!" == "debug" (
 
 rem generate ninja for release
 call gn.bat gen %OUTPUT_DIR% --root="src" ^
-  --args="is_debug=!debug! is_clang=true target_cpu=\"!arch!\" use_custom_libcxx=false rtc_include_tests=false rtc_build_examples=false rtc_build_tools=false is_component_build=false rtc_enable_protobuf=false rtc_use_h264=true symbol_level=0 enable_iterator_debugging=false use_cxx17=true"
+  --args="is_debug=!debug! is_clang=true target_cpu=\"!arch!\" use_custom_libcxx=false rtc_include_tests=false rtc_build_examples=false rtc_build_tools=false is_component_build=false rtc_enable_protobuf=false rtc_use_h264=true symbol_level=0 enable_iterator_debugging=false"
 
 rem build
 ninja.exe -C %OUTPUT_DIR% :default

webrtc-sys/libwebrtc/patches/windows_silence_warnings.patch

@@ -0,0 +1,14 @@
+diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
+index 8048ec5e8..4e00f7e53 100644
+--- a/build/config/compiler/BUILD.gn
++++ b/build/config/compiler/BUILD.gn
+@@ -1424,6 +1424,9 @@ config("default_warnings") {
+       # gethostbyname. Fires mostly in non-Chromium code. We probably
+       # want to remove this define eventually.
+       "_WINSOCK_DEPRECATED_NO_WARNINGS",
++
++      "_SILENCE_ALL_CXX17_DEPRECATION_WARNINGS",
++      "_SILENCE_ALL_CXX20_DEPRECATION_WARNINGS",
+     ]
+     if (!is_clang) {
+       # TODO(thakis): Remove this once