KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q29188: Unresolved External on __Clpow with /Oi and /FPa in C 5.xx

Article: Q29188
Product(s): See article
Version(s): 5.00 5.10
Operating System(s): MS-DOS
Keyword(s): ENDUSER | | mspl13_c
Last Modified: 15-JAN-1991

The C version 5.00 and 5.10 compilers generate an unresolved external
reference to __CIpow when the sample program below is compiled with
/Oi (or /Ox) and /FPa.

Intrinsic optimization (/Oi) and the alternate floating-point option
are not compatible and cannot be used together. This restriction is
noted in the C 5.10 README.DOC. The maximum optimization that you can
use with the alternate floating-point option is /Oalt.

Sample Code
-----------

   /* Compile with /Oi and /FPa  */

   #include <math.h>
   #include <stdio.h>

   main()
   {
   float  xx, yy;
   xx = 4.7;
   yy = 3.9;
   printf("%f", pow(xx,yy));
   }

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.