Avoid build failure when building without -fsanitize=address.

* src/lisp.h (UNALIGNED_LOAD_SIZE): Only use the sanitizer version of
the macro when USE_SANITIZER_UNALIGNED_LOAD is defined, avoiding link
errors when building without -fsanitize=address.

diff --git a/src/lisp.h b/src/lisp.h
index f466d4b0da59de275933137866a5c201341b6f26..be511a0eb9c0341444305a4dcbe7add70fcd3a7a 100644 (file)
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -5296,8 +5296,12 @@ __lsan_ignore_object (void const *p)
 }
 #endif
 
+/* If built with USE_SANITIZER_UNALIGNED_LOAD defined, use compiler
+   provided ASan functions to perform unaligned loads, allowing ASan
+   to catch bugs which it might otherwise miss.  */
 #if defined HAVE_SANITIZER_COMMON_INTERFACE_DEFS_H \
-  && defined ADDRESS_SANITIZER
+  && defined ADDRESS_SANITIZER                     \
+  && defined USE_SANITIZER_UNALIGNED_LOAD
 # include <sanitizer/common_interface_defs.h>
 # if (SIZE_MAX == UINT64_MAX)
 #  define UNALIGNED_LOAD_SIZE(a, i) \