diff --git a/configure.ac b/configure.ac index 60a54051576..0083a91da2a 100644 --- a/configure.ac +++ b/configure.ac @@ -103,7 +103,11 @@ AC_ARG_WITH([scalar], [AS_HELP_STRING([--with-scalar=64bit|32bit|auto], AC_CHECK_TYPES([__int128]) -AC_CHECK_DECL(__builtin_expect,AC_DEFINE(HAVE_BUILTIN_EXPECT,1,[Define this symbol if __builtin_expect is available]),,) +AC_MSG_CHECKING([for __builtin_expect]) +AC_COMPILE_IFELSE([AC_LANG_SOURCE([[void myfunc() {__builtin_expect(0,0);}]])], + [ AC_MSG_RESULT([yes]);AC_DEFINE(HAVE_BUILTIN_EXPECT,1,[Define this symbol if __builtin_expect is available]) ], + [ AC_MSG_RESULT([no]) + ]) if test x"$req_field" = x"auto"; then SECP_64BIT_ASM_CHECK