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Compiler/MSP430F5529: Symbol "CdcWriteCtrl" has already been defined when using whole program optimizations

Kevin Lannen
Intellectual 260 points

Part Number: MSP430F5529

Tool/software: TI C/C++ Compiler

I am trying to enable optimizations on some code I have written based on the C6_SendDataBackground USB CDC example from the USB developers package. When I switch to release mode and enable the whole program optimizations I receive the following errors:

<Linking>
error: symbol "CdcWriteCtrl" has already been defined
error: symbol "CdcReadCtrl" has already been defined
error: symbol "CdcWriteCtrl" has already been defined
error: symbol "CdcReadCtrl" has already been defined
error: symbol "CdcWriteCtrl" has already been defined
error: symbol "CdcReadCtrl" has already been defined
error: symbol "CdcWriteCtrl" has already been defined
error: symbol "CdcReadCtrl" has already been defined
error: symbol "CdcWriteCtrl" has already been defined
error: symbol "CdcReadCtrl" has already been defined
error: symbol "CdcWriteCtrl" has already been defined
error: symbol "CdcReadCtrl" has already been defined

I am able to replicate this error with the C6_SendDataBackgound example by switching to release and setting the Optimization Level to 4.

Is there a way to work around this error by changing the provided code in the example or is this a bug in the compiler?

The compiler version is 18.1.3.LTS.

These are the flags set:

-vmspx --data_model=restricted -O4 --use_hw_mpy=F5 --include_path="C:/ti/ccs820/ccsv8/ccs_base/msp430/include" --include_path="C:/Users/kevin/workspace_v8/C6_SendDataBackground" --include_path="C:/Users/kevin/workspace_v8/C6_SendDataBackground/driverlib/MSP430F5xx_6xx" --include_path="C:/Users/kevin/workspace_v8/C6_SendDataBackground/USB_config" --include_path="C:/ti/ccs820/ccsv8/tools/compiler/ti-cgt-msp430_18.1.3.LTS/include" --advice:power="none" --define=__MSP430F5529__ --define=DEPRECATED --printf_support=minimal --diag_warning=225 --diag_wrap=off --display_error_number --silicon_errata=CPU21 --silicon_errata=CPU22 --silicon_errata=CPU23 --silicon_errata=CPU40

Thanks

  • 0
    TI__Guru 56685 points
    Hello Kevin,

    I'll have to confer with our USB Stack expert here. I should be able to get back to you by Thursday.
  • 0 in reply to Jace H
    TI__Guru 56685 points
    Hello Kevin,

    We are still looking into this and seems to be an issue with the USB Stack. Hopefully we can get back to you by Wednesday next week.
  • 0 in reply to Jace H
    TI__Expert 6760 points

    Hello Kevin,

    Thank you for finding this issue.  The fix for this issue for you to be able to compile the code without error at level 4 optimization requires three changes to CdcUsb.h, CdcUsb.c and usb.c files.

    1) In CdcUsb.h file, the existing _CdcWrite and _CdcRead structures have to be declared with typedef as follows:

    typedef struct _CdcWrite {
....
 }_CdcWrite;

typedef struct _CdcRead {
 ...
}_CdcRead;

     

    2) In CdcUsb.c file, define the structures as follows:

    _CdcWrite CdcWriteCtrl[CDC_NUM_INTERFACES]; 
_CdcRead CdcReadCtrl[CDC_NUM_INTERFACES];

    3) In usb.c file extern the structures as follows:

    extern _CdcWrite CdcWriteCtrl[CDC_NUM_INTERFACES]; 
extern _CdcRead CdcReadCtrl[CDC_NUM_INTERFACES];

    A bug report has been filed against the USB stack to correct this issue in the next release of the stack.

    Regards,

    Arthi

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