Allow checking whether sanitizers are available

cmake/FindASan.cmake

@@ -39,13 +39,15 @@ if (SANITIZE_ADDRESS AND (SANITIZE_THREAD OR SANITIZE_MEMORY))
         "ThreadSanitizer or MemorySanitizer.")
 endif ()
 
-
 include(sanitize-helpers)
 
-if (SANITIZE_ADDRESS)
+sanitizer_check_compiler_flags("${FLAG_CANDIDATES}" "AddressSanitizer" "ASan")
-    sanitizer_check_compiler_flags("${FLAG_CANDIDATES}" "AddressSanitizer"
-        "ASan")
 
+if(ASan_FLAG_DETECTED)
+    set(ASan_FOUND TRUE)
+endif()
+
+if (SANITIZE_ADDRESS)
     find_program(ASan_WRAPPER "asan-wrapper" PATHS ${CMAKE_MODULE_PATH})
 	mark_as_advanced(ASan_WRAPPER)
 endif ()

cmake/FindMSan.cmake

@@ -31,6 +31,12 @@ set(FLAG_CANDIDATES
 
 include(sanitize-helpers)
 
+sanitizer_check_compiler_flags("${FLAG_CANDIDATES}" "MemorySanitizer" "MSan")
+
+if(MSan_FLAG_DETECTED)
+    set(MSan_FOUND TRUE)
+endif()
+
 if (SANITIZE_MEMORY)
     if (NOT ${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
         message(WARNING "MemorySanitizer disabled for target ${TARGET} because "
@@ -43,8 +49,6 @@ if (SANITIZE_MEMORY)
         set(SANITIZE_MEMORY Off CACHE BOOL
             "Enable MemorySanitizer for sanitized targets." FORCE)
     else ()
-        sanitizer_check_compiler_flags("${FLAG_CANDIDATES}" "MemorySanitizer"
-            "MSan")
     endif ()
 endif ()
 

cmake/FindSanitizers.cmake

@@ -40,6 +40,37 @@ find_package(MSan ${FIND_QUIETLY_FLAG})
 find_package(UBSan ${FIND_QUIETLY_FLAG})
 
 
+set(Sanitizers_COMPONENTS "")
+
+if(ASan_FOUND)
+    set(Sanitizers_ASan_FOUND TRUE)
+    list(APPEND Sanitizers_COMPONENTS ASan)
+endif()
+
+if(TSan_FOUND)
+    set(Sanitizers_TSan_FOUND TRUE)
+    list(APPEND Sanitizers_COMPONENTS TSan)
+endif()
+
+if(MSan_FOUND)
+    set(Sanitizers_MSan_FOUND TRUE)
+    list(APPEND Sanitizers_COMPONENTS MSan)
+endif()
+
+if(UBSan_FOUND)
+    set(Sanitizers_UBSan_FOUND TRUE)
+    list(APPEND Sanitizers_COMPONENTS UBSan)
+endif()
+
+
+include(FindPackageHandleStandardArgs)
+
+find_package_handle_standard_args(
+    Sanitizers
+    FOUND_VAR Sanitizers_FOUND
+    REQUIRED_VARS Sanitizers_COMPONENTS
+    HANDLE_COMPONENTS
+)
 
 
 function(sanitizer_add_blacklist_file FILE)

cmake/FindTSan.cmake

@@ -38,6 +38,12 @@ endif ()
 
 include(sanitize-helpers)
 
+sanitizer_check_compiler_flags("${FLAG_CANDIDATES}" "ThreadSanitizer" "TSan")
+
+if(TSan_FLAG_DETECTED)
+    set(TSan_FOUND TRUE)
+endif()
+
 if (SANITIZE_THREAD)
   if (NOT ${CMAKE_SYSTEM_NAME} STREQUAL "Linux" AND
       NOT ${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
@@ -50,9 +56,6 @@ if (SANITIZE_THREAD)
             "ThreadSanitizer is supported for 64bit systems only.")
         set(SANITIZE_THREAD Off CACHE BOOL
             "Enable ThreadSanitizer for sanitized targets." FORCE)
-    else ()
-        sanitizer_check_compiler_flags("${FLAG_CANDIDATES}" "ThreadSanitizer"
-            "TSan")
     endif ()
 endif ()
 

cmake/FindUBSan.cmake

@@ -32,10 +32,11 @@ set(FLAG_CANDIDATES
 
 include(sanitize-helpers)
 
-if (SANITIZE_UNDEFINED)
+sanitizer_check_compiler_flags("${FLAG_CANDIDATES}" "UndefinedBehaviorSanitizer" "UBSan")
-    sanitizer_check_compiler_flags("${FLAG_CANDIDATES}"
+
-        "UndefinedBehaviorSanitizer" "UBSan")
+if(UBSan_FLAG_DETECTED)
-endif ()
+    set(UBSan_FOUND TRUE)
+endif()
 
 function (add_sanitize_undefined TARGET)
     if (NOT SANITIZE_UNDEFINED)