* ext/bigdecimal/bigdecimal.c (BigDecimal_add),

test/bigdecimal/test_bigdecimal.rb:
  need to specify precision for converting Rational and Float.
  [ruby-core:48045] [Bug #7176]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37406 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Thu Nov  1 21:52:20 2012  Kenta Murata  <mrkn@mrkn.jp>
+
+	* ext/bigdecimal/bigdecimal.c (BigDecimal_add),
+	  test/bigdecimal/test_bigdecimal.rb:
+	  need to specify precision for converting Rational and Float.
+	  [ruby-core:48045] [Bug #7176]
+
 Thu Nov  1 21:42:20 2012  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* test/ruby/test_process.rb: Revert r37404.  My ubuntu box has

ext/bigdecimal/bigdecimal.c

@@ -821,23 +821,37 @@ BigDecimal_add(VALUE self, VALUE r)
     ENTER(5);
     Real *c, *a, *b;
     size_t mx;
-    GUARD_OBJ(a,GetVpValue(self,1));
-    b = GetVpValue(r,0);
-    if(!b) return DoSomeOne(self,r,'+');
+
+    GUARD_OBJ(a, GetVpValue(self, 1));
+    if (TYPE(r) == T_FLOAT) {
+	b = GetVpValueWithPrec(r, DBL_DIG+1, 1);
+    }
+    else if (TYPE(r) == T_RATIONAL) {
+	b = GetVpValueWithPrec(r, a->Prec*VpBaseFig(), 1);
+    }
+    else {
+	b = GetVpValue(r,0);
+    }
+
+    if (!b) return DoSomeOne(self,r,'+');
     SAVE(b);
-    if(VpIsNaN(b)) return b->obj;
-    if(VpIsNaN(a)) return a->obj;
-    mx = GetAddSubPrec(a,b);
+
+    if (VpIsNaN(b)) return b->obj;
+    if (VpIsNaN(a)) return a->obj;
+
+    mx = GetAddSubPrec(a, b);
     if (mx == (size_t)-1L) {
-        GUARD_OBJ(c,VpCreateRbObject(VpBaseFig() + 1, "0"));
-        VpAddSub(c, a, b, 1);
-    } else {
-        GUARD_OBJ(c,VpCreateRbObject(mx *(VpBaseFig() + 1), "0"));
-        if(!mx) {
-            VpSetInf(c,VpGetSign(a));
-        } else {
-            VpAddSub(c, a, b, 1);
-        }
+	GUARD_OBJ(c,VpCreateRbObject(VpBaseFig() + 1, "0"));
+	VpAddSub(c, a, b, 1);
+    }
+    else {
+	GUARD_OBJ(c, VpCreateRbObject(mx * (VpBaseFig() + 1), "0"));
+	if(!mx) {
+	    VpSetInf(c, VpGetSign(a));
+	}
+	else {
+	    VpAddSub(c, a, b, 1);
+	}
     }
     return ToValue(c);
 }

test/bigdecimal/test_bigdecimal.rb

@@ -587,6 +587,10 @@ class TestBigDecimal < Test::Unit::TestCase
 
     a, b = BigDecimal("0.11111").coerce(1.quo(3))
     assert_equal(BigDecimal("0." + "3"*a.precs[0]), a)
+
+    assert_nothing_raised(TypeError, '#7176') do
+      BigDecimal.new('1') + Rational(1)
+    end
   end
 
   def test_uplus