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not used functions linked and declares XDATA for local vars

Sergio Santos

Hello,

I have detected that some functions like this one are using their own XDATA space instead of using the XDATA_GROUP for local purposes:

for example this one:

void zmemcpy2(UINT8 *dst,const UINT8 *src, UINT32 len)
{

      --dst;   --src;
       while (len--)
       {
          *(++dst) = *(++src);
   }
}

then this is the line in the m51 file:

XDATA   82C2H     000AH     UNIT         ?XD?_ZMEMCPY2?LIB


so then Im wasting ten bytes of global data space for just a memcopy. Why is this happening?

And here it is another weird thing: this function is never used by the rest of the program. It is compiled, but should not be linked.
any idea?

thanks in advance...

Parents
  • 0 in reply to Per Westermark

    A Library is a special type of object file specifically designed so that the Linker can pick out only those functions that are actually required;

    Otherwise, in general, if you tell a Linker to include an Object file, it will do so - it's up to you not to tell the Linker to link unused stuff!

Reply
  • 0 in reply to Per Westermark

    A Library is a special type of object file specifically designed so that the Linker can pick out only those functions that are actually required;

    Otherwise, in general, if you tell a Linker to include an Object file, it will do so - it's up to you not to tell the Linker to link unused stuff!

Children
  • 0 in reply to Andy Neil

    A Library is a special type of object file specifically designed so that the Linker can pick out only those functions that are actually required;

    fully stated: "so that the Linker can pick out only those modules containing functions that are actually required"

    you can easily get 'unused functions' from a library if the modules there contain more than one function.

    Erik