Home/ Questions/Error: incompatible implicit declaration of built-in function ‘malloc’ – quick tips
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Presley Miller
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Asked: 2022-05-18T19:27:36+00:00 In:

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

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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!

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2 Answers

  1. Best Answer
    Expert

    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 <stdlib.h> to fix the problem.

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  2. #include <stdlib.h> is required. It must be #include <stdlib.h>.

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