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Undefined : "__HEAP_START" Undefined : "__mem_limit" Undefined : "__stack_safety"  link failed

Question asked by changxy chang on Aug 25, 2013
Latest reply on Aug 29, 2013 by jorge_plascencia

I am using Code Warrior 7.2 and building for the  54418 CPU, with MQX V3.7

 

I have ported some existing code over and fixed a bunch of compile errors. I am now stuck on some linker errors. I realise because the code uses malloc() and free() I need to define a heap.

 

 

Error   : Undefined : "__HEAP_START"

Referenced from "__break" in

Error   : Undefined : "__mem_limit"

alloc.c line 176   Referenced from "brk" in

Error   : Undefined : "__stack_safety"

alloc.c line 176   Referenced from "brk" in

Link failed.

 

 

 

I have no idea how to fix the problem with  "__mem_limit"  and "__stack_safety" variables

 

I have now removed all my app code and get the same link error.

 

I have tested a new project piece of code from MQX 3.7

 

 

Just adding the lines

 

#include <stdlib.h>

 

char *ptr;

ptr = malloc(1000)

 

triggers the link errors, Take out the malloc line, and link error goes away

 

 

 

 

 

 

 

 

Undefined : "__HEAP_START" Undefined : "__mem_limit" Undefined : "__stack_safety"  link failed

I would appreciate any help on this problem, thanks.

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