add huge allocation test (see #544 by @tiran)

Author: daanx

CMakeLists.txt

@@ -158,7 +158,7 @@ if(MI_DEBUG_UBSAN)
   if(CMAKE_BUILD_TYPE MATCHES "Debug")    
     if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
       message(STATUS "Build with undefined-behavior sanitizer (MI_DEBUG_UBSAN=ON)")
-      list(APPEND mi_cflags -fsanitize=undefined -g)
+      list(APPEND mi_cflags -fsanitize=undefined -g -fno-sanitize-recover=undefined)
       list(APPEND CMAKE_EXE_LINKER_FLAGS -fsanitize=undefined)
       if (NOT MI_USE_CXX)
         message(STATUS "(switch to use C++ due to MI_DEBUG_UBSAN)")

test/test-api.c

@@ -72,6 +72,10 @@ int main(void) {
   CHECK_BODY("calloc0",{
     result = (mi_usable_size(mi_calloc(0,1000)) <= 16);
   });
+  CHECK_BODY("malloc-large",{   // see PR #544.
+    void* p = mi_malloc(67108872);
+    mi_free(p);
+  });
 
   // ---------------------------------------------------
   // Extended