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dnl -*- Autoconf -*-
AC_DEFUN([RUBY_CHECK_BUILTIN_OVERFLOW], [dnl
{ # $0($1)
RUBY_CHECK_BUILTIN_FUNC(__builtin_[$1]_overflow, [int x;__builtin_[$1]_overflow(0,0,&x)])
RUBY_CHECK_BUILTIN_FUNC(__builtin_[$1]_overflow_p, [__builtin_[$1]_overflow_p(0,0,(int)0)])
AS_IF([test "$rb_cv_builtin___builtin_[$1]_overflow" != no], [
AC_CACHE_CHECK(for __builtin_[$1]_overflow with long long arguments, rb_cv_use___builtin_[$1]_overflow_long_long, [
AC_LINK_IFELSE([AC_LANG_SOURCE([[
@%:@pragma clang optimize off
int
main(void)
{
long long x = 0, y;
__builtin_$1_overflow(x, x, &y);
return 0;
}
]])],
rb_cv_use___builtin_[$1]_overflow_long_long=yes,
rb_cv_use___builtin_[$1]_overflow_long_long=no)])
])
AS_IF([test "$rb_cv_use___builtin_[$1]_overflow_long_long" = yes], [
AC_DEFINE(USE___BUILTIN_[]AS_TR_CPP($1)_OVERFLOW_LONG_LONG, 1)
])
}
])dnl
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