feat: enable /Wall with MSVC

cmake/CMakeCompiler.cmake

@@ -4,7 +4,16 @@ macro(setup_default_compiler_flags _project_name)
 	if(MSVC) # That's also clang-cl
 		# Replace some default compiler switches and add new ones
 		STRING(REPLACE "/GR" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})			# Disable RTTI
-		STRING(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})		# Bump warnings to W4
+		if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+			STRING(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})			# Enable level 4 warnings
+		else()
+			if(MSVC_VERSION GREATER 1920)
+				# VS2019 and above
+				STRING(REPLACE "/W3" "/Wall" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})	# Enable all warnings
+			else()
+				STRING(REPLACE "/W3" "/W4" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})		# Enable level 4 warnings
+			endif()
+		endif()
 		target_compile_options(${_project_name} PRIVATE /Zi)				# Add debug info
 		target_compile_options(${_project_name} PRIVATE /Oi)				# Generate intrinsic functions
 		target_compile_options(${_project_name} PRIVATE /WX)				# Treat warnings as errors
@@ -27,6 +36,20 @@ macro(setup_default_compiler_flags _project_name)
 			add_definitions(-DRTM_NO_INTRINSICS)
 		endif()
 
+		# Disable various warnings that are harmless
+		target_compile_options(${_project_name} PRIVATE /wd4514)			# Unreferenced inline function removed
+		target_compile_options(${_project_name} PRIVATE /wd4619)			# No warning with specified number
+		target_compile_options(${_project_name} PRIVATE /wd4820)			# Padding added after data member
+		target_compile_options(${_project_name} PRIVATE /wd4710)			# Function not inlined
+		target_compile_options(${_project_name} PRIVATE /wd4711)			# Function selected for automatic inlining
+		target_compile_options(${_project_name} PRIVATE /wd4738)			# Storing 32-bit float in memory leads to rounding (x86)
+		target_compile_options(${_project_name} PRIVATE /wd5045)			# Spectre mitigation for memory load
+
+		if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
+			target_compile_options(${_project_name} PRIVATE -Wno-c++98-compat)				# No need to support C++98
+			target_compile_options(${_project_name} PRIVATE -Wno-c++98-compat-pedantic)		# No need to support C++98
+		endif()
+
 		# Add linker flags
 		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /DEBUG")
 	else()
@@ -65,6 +88,9 @@ macro(setup_default_compiler_flags _project_name)
 		target_compile_options(${_project_name} PRIVATE -Wshadow)			# Enable shadowing warnings
 		target_compile_options(${_project_name} PRIVATE -Werror)			# Treat warnings as errors
 
+		# Disable various warnings that are harmless
+		target_compile_options(${_project_name} PRIVATE -Wno-c++98-compat)	# No need to support C++98
+
 		target_compile_options(${_project_name} PRIVATE -g)					# Enable debug symbols
 	endif()
 endmacro()