Availability of attributes are checked in configure these days, rather than compiler macros. Also __attribute__((no_address_safety_analysis)) is considered deprecated in both GCC and Clang. Use the current best practice if available. See also: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html https://clang.llvm.org/docs/AddressSanitizer.html git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65558 b2dd03c8-39d4-4d8f-98ff-823fe69b080e