build: Turn on asan

build.bat

@@ -4,6 +4,9 @@ set code_dir=%~dp0
 if not exist Build mkdir Build
 pushd Build
 
+    REM ------------------------------------------------------------------------
+    REM Flags
+    REM ------------------------------------------------------------------------
     REM MT     Static CRT
     REM EHa-   Disable exception handling
     REM GR-    Disable C RTTI
@@ -12,17 +15,33 @@ pushd Build
     REM Z7     Combine multi-debug files to one debug file
     REM wd4201 Nonstandard extension used: nameless struct/union
     REM Tp     Treat header file as CPP source file
+    set flags=-MT -EHa -GR- -Od -Oi -Z7 -wd4201 -D DQN_TEST_WITH_MAIN %code_dir%Dqn_Tests.cpp -link -nologo
+    set msvc_flags=-fsanitize=address -D STBSP__ASAN=__declspec(no_sanitize_address)
+    set clang_flags=-fsanitize=address
+
+    REM ------------------------------------------------------------------------
+    REM Compiler: MSVC cl
+    REM ------------------------------------------------------------------------
+    where /q cl || (
+        echo [ERROR] cl is not found, please put MSVC's cl on the path
+        exit /b 1
+    )
 
     if not exist msvc mkdir msvc
-    if not exist clang mkdir clang
-
-    set flags=/MT /EHa /GR- /Od /Oi /Z7 /wd4201 /D DQN_TEST_WITH_MAIN %code_dir%Dqn_Tests.cpp /link /nologo
-
     pushd msvc
-    cl %flags%
+    cl %msvc_flags% %flags%
     popd
 
+    REM ------------------------------------------------------------------------
+    REM Compiler: clang-cl
+    REM ------------------------------------------------------------------------
+    where /q clang-cl || (
+        echo [WARN] Optional clang compile via clang-cl if it's in the path, please put clang-cl on the path for this feature
+        exit /b 0
+    )
+
+    if not exist clang mkdir clang
     pushd clang
-    clang-cl %flags%
+    clang-cl %clang_flags% %flags%
     popd
 popd