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

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  Information in this article applies to:

  • C51, version 7

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  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

  • Refer to VARBANKING in the Cx51 User's Guide.

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  Refer to VARBANKING in the Cx51 User's Guide.

Last Reviewed: Thursday, February 25, 2021