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C51: STARTUP CODE UNRESOLVED EXTERNAL (?B_SWITCH0)


Information in this article applies to:

  • C51 Version 6.12

QUESTION

I am using C51 Version 6.12 and when I try to build a simple project, I receive the following linker error:

Warning L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: ?B_SWITCH0
MODULE: STARTUP.OBJ (?C_STARTUP)

I do not receive this error message if I exclude the startup code. However, I was under the impression that this is required.

ANSWER

This is a known problem in C51 V6.12. It has been corrected in C51 V6.14. You may download the latest updates from the Keil Website.

Last Reviewed: Monday, October 11, 2004


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