1 files changed, 48 insertions, 3 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0dfa0857..6d5994f4 100644..100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,8 +1,54 @@
 cmake_minimum_required(VERSION 3.0)
 
 # Config options
-set(BUILD_EXAMPLES ON CACHE BOOL "Build the examples.")
-set(BUILD_GAMES ON CACHE BOOL "Build the example games.")
+option(BUILD_EXAMPLES "Build the examples." ON)
+option(BUILD_GAMES "Build the example games." ON)
+option(ENABLE_ASAN  "Enable AddressSanitizer (ASAN) for debugging (degrades performance)" OFF)
+option(ENABLE_UBSAN "Enable UndefinedBehaviorSanitizer (UBSan) for debugging" OFF)
+option(ENABLE_MSAN "Enable MemorySanitizer (MSan) for debugging (not recommended for run with ASAN)" OFF)
+
+if(CMAKE_VERSION VERSION_LESS "3.1")
+  if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
+    set(CMAKE_C_FLAGS "-std=gnu99 ${CMAKE_C_FLAGS}")
+  endif()
+else()
+  set (CMAKE_C_STANDARD 99)
+endif()
+
+include(CheckCCompilerFlag)
+function(add_if_flag_works flag)
+    CHECK_C_COMPILER_FLAG("${flag}" COMPILER_HAS_THOSE_TOGGLES)
+    set(outcome "Failed")
+    if(COMPILER_HAS_THOSE_TOGGLES)
+        foreach(var ${ARGN})
+            set(${var} "${flag} ${${var}}" PARENT_SCOPE)
+        endforeach()
+        set(outcome "works")
+    endif()
+    message(STATUS "Testing if ${flag} can be used -- ${outcome}")
+endfunction()
+
+add_if_flag_works(-Werror=pointer-arith CMAKE_C_FLAGS)
+add_if_flag_works(-Werror=implicit-function-declaration CMAKE_C_FLAGS)
+# src/external/jar_xm.h does shady stuff
+add_if_flag_works(-fno-strict-aliasing CMAKE_C_FLAGS)
+
+if (ENABLE_ASAN)
+    add_if_flag_works(-fno-omit-frame-pointer CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+    add_if_flag_works(-fsanitize=address CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+endif()
+if (ENABLE_UBSAN)
+    add_if_flag_works(-fno-omit-frame-pointer CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+    add_if_flag_works(-fsanitize=undefined CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+endif()
+if (ENABLE_MSAN)
+    add_if_flag_works(-fno-omit-frame-pointer CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+    add_if_flag_works(-fsanitize=memory CMAKE_C_FLAGS CMAKE_LINKER_FLAGS)
+endif()
+
+if (ENABLE_MSAN AND ENABLE_ASAN)
+    MESSAGE(WARNING "Compiling with both AddressSanitizer and MemorySanitizer is not recommended")
+endif()
 
 add_subdirectory(src release)
 
@@ -13,4 +59,3 @@ endif()
 if (${BUILD_GAMES})
   add_subdirectory(games)
 endif()
-