BUG: Warning C4056 Generated When /Op Option is Used

• Microsoft C/C++ Compiler (CL.EXE) included with: - Microsoft Visual C++, 32-bit Edition, versions 2.0, 4.0, 4.1, 4.2,

       5.0 on the following platform:
       - x86
  

  - Microsoft Visual C++ 2.0 Cross-Development Edition for the Macintosh

SYMPTOMS

The following warning is generated when the sample code listed in the More Information section below is compiled with the option /Op and the warning level set to 3 or higher:

   warning C4056 : overflow in floating-point constant arithmetic

RESOLUTION

Ignore the warning as it is generated incorrectly. Alternatively, you can suppress the warning by using the /W2 option.

STATUS

Microsoft has confirmed this to be a bug in the products listed above. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Sample Code to Reproduce Problem

   /* Compile options needed:   /Op /W3
   */

   void main()
   {
       double i;
       i = -1.0;
   }