Fix compilation errors with C++20

CMakeLists.txt

@@ -26,6 +26,8 @@ function(set_default_warning_settings target)
         if(CMAKE_CXX_COMPILER_ID MATCHES "Clang") # match both "Clang" and "AppleClang"
             target_compile_options(${target} PRIVATE
                 -Wc++17-compat-pedantic
+                -Wc++20-compat-pedantic
+                -Wpre-c2x-compat-pedantic
                 -Wc99-extensions
                 -Wgnu
                 -Wnon-gcc

rerun_cpp/src/rerun/datatypes/quaternion_ext.cpp

@@ -13,32 +13,34 @@ namespace rerun {
 
         /// Construct Quaternion from x/y/z/w values.
         static Quaternion from_xyzw(float x, float y, float z, float w) {
-            return Quaternion{x, y, z, w};
+            return Quaternion::from_xyzw({x, y, z, w});
         }
 
         /// Construct Quaternion from w/x/y/z values.
         static Quaternion from_wxyz(float w, float x, float y, float z) {
-            return Quaternion{x, y, z, w};
+            return Quaternion::from_xyzw(x, y, z, w);
         }
 
         /// Construct Quaternion from x/y/z/w array.
         static Quaternion from_xyzw(std::array<float, 4> xyzw_) {
-            return Quaternion{xyzw_};
+            Quaternion q;
+            q.xyzw = xyzw_;
+            return q;
         }
 
         /// Construct Quaternion from w/x/y/z array.
         static Quaternion from_wxyz(std::array<float, 4> wxyz_) {
-            return Quaternion{wxyz_[1], wxyz_[2], wxyz_[3], wxyz_[0]};
+            return Quaternion::from_xyzw(wxyz_[1], wxyz_[2], wxyz_[3], wxyz_[0]);
         }
 
         /// Construct Quaternion from x/y/z/w float pointer.
         static Quaternion from_xyzw(const float* xyzw_) {
-            return Quaternion{xyzw_[0], xyzw_[1], xyzw_[2], xyzw_[3]};
+            return Quaternion::from_xyzw(xyzw_[0], xyzw_[1], xyzw_[2], xyzw_[3]);
         }
 
         /// Construct Quaternion from w/x/y/z float pointer.
         static Quaternion from_wxyz(const float* wxyz_) {
-            return Quaternion{wxyz_[1], wxyz_[2], wxyz_[3], wxyz_[0]};
+            return Quaternion::from_xyzw(wxyz_[1], wxyz_[2], wxyz_[3], wxyz_[0]);
         }
 
         float x() const {

rerun_cpp/tests/archetypes/transform3d.cpp

@@ -79,7 +79,7 @@ SCENARIO(
     }
 
     SECTION("TranslationRotationScale") {
-        const auto rotation = rrd::Quaternion{1.0f, 2.0f, 3.0f, 4.0f};
+        const auto rotation = rrd::Quaternion::from_xyzw(1.0f, 2.0f, 3.0f, 4.0f);
 
         Transform3D manual;
         rrd::TranslationRotationScale3D translation_rotation_scale;