Older clang versions raise:
```
./flatbuffers/base.h:365:1: error: unknown attribute 'no_sanitize' ignored [-Werror,-Wattributes]
__supress_ubsan__("alignment")
^
./flatbuffers/base.h:246:50: note: expanded from macro '__supress_ubsan__'
#define __supress_ubsan__(type) __attribute__((no_sanitize(type)))
^
```
Comparing https://releases.llvm.org/3.6.0/tools/clang/docs/AttributeReference.html
with https://releases.llvm.org/3.7.0/tools/clang/docs/AttributeReference.html
shows that __attribute__((no_sanitize(type))) is available since 3.7.0
// Suppress Undefined Behavior Sanitizer (recoverable only). Usage:
// - __supress_ubsan__("undefined")
// - __supress_ubsan__("signed-integer-overflow")
-#if defined(__clang__)
+#if defined(__clang__) && (__clang_major__ > 3 || (__clang_major__ == 3 && __clang_minor__ >=7))
#define __supress_ubsan__(type) __attribute__((no_sanitize(type)))
#elif defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 409)
#define __supress_ubsan__(type) __attribute__((no_sanitize_undefined))