restored SANITIZE make option (#3043)

* restored basic support for SANITIZE make option

* disabled some unwanted UBSAN checks / enabled nullability checks / enabled ASAN use-after-scope checks (nw)

makefile

@@ -40,7 +40,7 @@
 
 # DEBUG = 1
 # PROFILER = 1
-# SANITIZE = 1
+# SANITIZE = 
 
 # PTR64 = 1
 # BIGENDIAN = 1
@@ -781,6 +781,10 @@ endif
 ifdef WEBASSEMBLY
 PARAMS += --WEBASSEMBLY='$(WEBASSEMBLY)'
 endif
+
+ifdef SANITIZE
+PARAMS += --SANITIZE='$(SANITIZE)'
+endif
 #-------------------------------------------------
 # All scripts
 #-------------------------------------------------

scripts/genie.lua

@@ -386,6 +386,11 @@ newoption {
 	description = "Produce WebAssembly output when building with Emscripten.",
 }
 
+newoption {
+	trigger = "SANITIZE",
+	description = "Specifies the santizer(s) to use."
+}
+
 newoption {
 	trigger = "PROJECT",
 	description = "Select projects to be built. Will look into project folder for files.",
@@ -950,14 +955,42 @@ end
 	buildoptions_cpp {
 		"-Woverloaded-virtual",
 	}
-
---ifdef SANITIZE
---CCOMFLAGS += -fsanitize=$(SANITIZE)
+	
+if _OPTIONS["SANITIZE"] then
+	buildoptions {
+		"-fsanitize=".. _OPTIONS["SANITIZE"]
+	}
+	linkoptions {
+		"-fsanitize=".. _OPTIONS["SANITIZE"]
+	}
+	if string.find(_OPTIONS["SANITIZE"], "address") then
+		buildoptions {
+			"-fsanitize-address-use-after-scope"
+		}
+		linkoptions {
+			"-fsanitize-address-use-after-scope"
+		}
+	end
+	if string.find(_OPTIONS["SANITIZE"], "undefined") then
+		-- 'function' produces errors without delegates by design
+		-- 'alignment' produces a lot of errors which we are not interested in
+		-- 'nullability' errors are not actually undefined behavior but unintentional
+		buildoptions {
+			"-fno-sanitize=function",
+			"-fno-sanitize=alignment",
+			"-fsanitize=nullability"
+		}
+		linkoptions {
+			"-fno-sanitize=function",
+			"-fno-sanitize=alignment",
+			"-fsanitize=nullability"
+		}
+	end
+end
 
 --ifneq (,$(findstring thread,$(SANITIZE)))
 --CCOMFLAGS += -fPIE
 --endif
---endif