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Weird error with mktime..

Jay Kay

Hi,

I'm using uVision 3,23 with CA.exe (compiler) V2.41 and LA.exe (linker) 2.41. The program compiles, but with the linking run, I get errors;

*** WARNING L23: UNRESOLVED EXTERNAL SYMBOLS
*** ERROR L128: REFERENCE MADE TO UNRESOLVED EXTERNAL SYMBOL: mktime?T ADDRESS: 200023B4H

... :S. I've tried I guess everything. This error happens with the line:

  time_t TIME;
  struct tm *ptim;
  /* the rest of my code... */
TIME = mktime(ptim)-0x3FF36300;

.

If I comment that line, the linker does the linkiing fine. The mktime() is declared in time.h, and the file is included. When I put the decleration in the local file; same error.. I don't know what to do anymore :S. Any ideas?
The microcontroller is a STR7 and the code is for sync the hardware-RTC with the current time..

Thank you so so very much..

Jay.

Parents
  • 0 in reply to ImPer Westermark

    Hi,

    I am trying to use the RTC of LPC2378 and the RTX kernel of KEIL.

    After reading this thread, I started to study the mktime() and localtime().

    The return value of localtime() looks strange to me. After some further study, I found another function, localtime_r(), "which is thread-safe and returns values in a user-supplied buffer instead of possibly using a static data area that may be overwritten by each call."

    To define/reduce the Task stack size of RTX is difficult to someone like me. My question is: if I use
    localtime() in one Task, does it need larger Task stack size?

    It seems that snprintf() needs a larger Task stack size. If this is true, then why? does snprintf() also use a static data area?

Reply
  • 0 in reply to ImPer Westermark

    Hi,

    I am trying to use the RTC of LPC2378 and the RTX kernel of KEIL.

    After reading this thread, I started to study the mktime() and localtime().

    The return value of localtime() looks strange to me. After some further study, I found another function, localtime_r(), "which is thread-safe and returns values in a user-supplied buffer instead of possibly using a static data area that may be overwritten by each call."

    To define/reduce the Task stack size of RTX is difficult to someone like me. My question is: if I use
    localtime() in one Task, does it need larger Task stack size?

    It seems that snprintf() needs a larger Task stack size. If this is true, then why? does snprintf() also use a static data area?

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