Set x86 FPU precision to 64-bit for MinGW. Original patch by Jonathan Liu <net147@gmail.com>.

test/cctest/test-strtod.cc

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
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+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
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+//       with the distribution.
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+//
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 #include <stdlib.h>
 
 #include "v8.h"
 
 #include "bignum.h"
 #include "cctest.h"
 #include "diy-fp.h"
 #include "double.h"
 #include "strtod.h"
 
 using namespace v8::internal;
 
 static Vector<const char> StringToVector(const char* str) {
   return Vector<const char>(str, StrLength(str));
 }
 
 
 static double StrtodChar(const char* str, int exponent) {
   return Strtod(StringToVector(str), exponent);
 }
 
 
 TEST(Strtod) {
+  v8::V8::Initialize();
+
   Vector<const char> vector;
 
   vector = StringToVector("0");
   CHECK_EQ(0.0, Strtod(vector, 1));
   CHECK_EQ(0.0, Strtod(vector, 2));
   CHECK_EQ(0.0, Strtod(vector, -2));
   CHECK_EQ(0.0, Strtod(vector, -999));
   CHECK_EQ(0.0, Strtod(vector, +999));
 
   vector = StringToVector("1");
@@ skipping 408 matching lines @@
         buffer[pos++] = random() % 10 + '0';
       }
       int exponent = DeterministicRandom() % (308*2 + 1) - 308 - length;
       buffer[pos] = '\0';
       Vector<const char> vector(buffer, pos);
       double strtod_result = Strtod(vector, exponent);
       CHECK(CheckDouble(vector, exponent, strtod_result));
     }
   }
 }