Set -ffp-contract=off flag for clang on LoongArch (#1595)

This fixes some failing unit tests

Build/CMakeLists.txt

@@ -233,12 +233,14 @@ else()
 		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ffp-model=precise")
 
 		# On clang 14 and later we can turn off float contraction through a pragma, older versions and deterministic versions need it off always, see Core.h
-		if (CMAKE_CXX_COMPILER_VERSION LESS 14 OR CROSS_PLATFORM_DETERMINISTIC)
+		# clang on LoongArch does not support such pragma, also turn off contraction for it.
+		if (CMAKE_CXX_COMPILER_VERSION LESS 14 OR CROSS_PLATFORM_DETERMINISTIC OR "${CMAKE_SYSTEM_PROCESSOR}" MATCHES "loongarch")
 			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ffp-contract=off")
 
 			# emcc complains with: warning: overriding '-ffp-model=precise' option with '-ffp-contract=off' [-Woverriding-option],
+			# clang > 19 also report this as an error,
 			# but this is exactly what we want.
-			if (EMSCRIPTEN)
+			if (EMSCRIPTEN OR CMAKE_CXX_COMPILER_VERSION GREATER 19)
 				set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-overriding-option")
 			endif()
 		endif()