Use rb_funcall if rb_big_cmp doesn't exist

Author: nurse

ext/mysql2/extconf.rb

@@ -24,7 +24,7 @@ def asplode(lib)
 have_func('rb_wait_for_single_fd')
 have_func('rb_hash_dup')
 have_func('rb_intern3')
-have_func('rb_big_and')
+have_func('rb_big_cmp')
 
 # borrowed from mysqlplus
 # http://github.com/oldmoe/mysqlplus/blob/master/ext/extconf.rb

ext/mysql2/statement.c

@@ -4,6 +4,9 @@ VALUE cMysql2Statement;
 extern VALUE mMysql2, cMysql2Error, cBigDecimal, cDateTime, cDate;
 static VALUE sym_stream, intern_new_with_args, intern_each;
 static VALUE intern_usec, intern_sec, intern_min, intern_hour, intern_day, intern_month, intern_year, intern_to_s;
+#ifndef HAVE_RB_BIG_CMP
+static ID id_cmp;
+#endif
 
 #define GET_STATEMENT(self) \
   mysql_stmt_wrapper *stmt_wrapper; \
@@ -209,8 +212,8 @@ static int my_big2ll(VALUE bignum, LONG_LONG *ptr)
 {
   unsigned LONG_LONG num;
   size_t len;
-  int nlz_bits = 0;
 #ifdef HAVE_RB_ABSINT_SIZE
+  int nlz_bits = 0;
   len = rb_absint_size(bignum, &nlz_bits);
 #else
   len = RBIGNUM_LEN(bignum) * SIZEOF_BDIGITS;
@@ -223,14 +226,17 @@ static int my_big2ll(VALUE bignum, LONG_LONG *ptr)
     *ptr = num;
   }
   else {
-    if (len == 8 && nlz_bits == 0 &&
+    if (len == 8 &&
+#ifdef HAVE_RB_ABSINT_SIZE
+        nlz_bits == 0 &&
+#endif
+#if defined(HAVE_RB_ABSINT_SIZE) && defined(HAVE_RB_ABSINT_SINGLEBIT_P)
         /* only -0x8000000000000000 is safe if `len == 8 && nlz_bits == 0` */
-#ifdef HAVE_RB_ABSINT_SINGLEBIT_P
         !rb_absint_singlebit_p(bignum)
-#elif defined(HAVE_RB_BIG_AND)
-        rb_big_and(bignum, LL2NUM(LLONG_MAX)) != INT2FIX(0)
-#else
+#elif defined(HAVE_RB_BIG_CMP)
         rb_big_cmp(bignum, LL2NUM(LLONG_MIN)) == INT2FIX(-1)
+#else
+        rb_funcall(bignum, intern_cmp, 1, LL2NUM(LLONG_MIN)) == INT2FIX(-1)
 #endif
        ) {
       goto overflow;
@@ -553,4 +559,7 @@ void init_mysql2_statement() {
   intern_year = rb_intern("year");
 
   intern_to_s = rb_intern("to_s");
+#ifndef HAVE_RB_BIG_CMP
+  id_cmp = rb_intern("cmp");
+#endif
 }