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C51: UNRESOLVED EXTERNAL ?C?CLDOPTR


Information in this article applies to:

  • C51 Version 7

SYMPTOM

When writing code for SLE66xxxPE devices the following linker error is issued:

*** ERROR L127: UNRESOLVED EXTERNAL SYMBOL
    SYMBOL:  ?C?CLDOPTR

CAUSE

The SLE66xxxPE devices are using special run-time libraries that do not include the following functions: ?C?CLDOPTR, ?C?CSTOPTR, ?C?ILDOPTR, ?C?ISTOPTR, ?C?LLDOPTR, ?C?LSTOPTR.

RESOLUTION

You must set the VARBANKING compiler directive for the SLE66xxxPE devices. In µVision, this directive is enabled under Project — Options for Target — Target with the option 'far' memory type support.

MORE INFORMATION

Last Reviewed: Friday, January 12, 2007


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