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MSP430 optimization level 4 causes an error

Koichiro Tashiro
Mastermind 21140 points

My MSP430 customer reported TI compiler (v4.4.1) generates below error if “4 whole optimization” level is used.

> error: symbol "SelfTestErrorCode" redeclared with incompatible type:

Up to “3 interprocedure optimization” is OK.
What is root cause of the error ?

Thanks and regards,
Koichiro

  • TI__Guru* 84225 points
    Usually that error message is accurate; the symbol is used in one file and declared in another with different declarations, and when you use level 4 optimization, the compiler gets picky about that stuff. The difference is sometimes very hard to spot. Could you get a test case from the user? If not, the user will need to carefully examine each instance of SelfTestErrorCode to make sure they are declared in exactly the same way. In addition, if its type is a derived type, the user will need to make sure each type it is derived from is exactly the same, including struct members, and each type those types are derived from, and so on.
  • in reply to Archaeologist
    TI__Mastermind 21140 points
    Hi,Thank you for your reply. I will ask customer to give us the project.
    By the way, could you tell me why the issue is reported only with level4 ?
    It is not checked with level3 and lower level ?Thanks and regards,Koichiro
  • in reply to Koichiro Tashiro
    TI__Guru* 84225 points
    Optimization level 4 is cross-file optimization. Type checking in the linker is only performed when using cross-file optimization. Level 3 does not perform cross-file optimization.
  • in reply to Archaeologist
    TI__Mastermind 21140 points
    Sorry for late reply.This item is now closed.Thanks a lot for your help on this!
    Thanks and regards,Koichiro