Error: incompatible implicit declaration of built-in function ‘malloc’ – quick tips

Question

How to solve the problem - incompatible implicit declaration of built-in function ‘malloc’? I have the sample detail:

fileinfo_list* tempList = malloc(sizeof(fileinfo_list));

typedef struct {
  fileinfo** filedata;
  size_t nFiles;
  size_t size;
  size_t fileblock;
 } fileinfo_list;

While I was running it, I found the warning message:

warning: incompatible implicit declaration of built-in function ‘malloc’

That is my question in my midterm exam, and it is urgent. I searched the solutions on some websites, but I didn't get it. I may miss any line or other changes. I appreciate your assistance!

dttutoria · Accepted Answer

The cause: You get the error: incompatible implicit declaration of built-in function ‘malloc’ because it lack of stdlib header file. If not, it is written as int malloc(), which is unsuited with the built-in form void *malloc(size t).

Solution: It needs to#include to fix the problem.

Sacha Arnaud · Answer

#include is required. It must be #include .

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Error: incompatible implicit declaration of built-in function ‘malloc’ – quick tips

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