How to resolve compiler warning implicit declaration of function memset

Question

My c code uses  memset  and  close   And I have added    include  lt stdio h gt   include  lt glib h gt   include  lt stdlib h gt    But I still get these warnings   main c 259  warning  implicit declaration of function    memset    main c 259  warning  incompatible implicit declaration of built-in function    memset    main c 268  warning  implicit declaration of function    close    main c 259  warning  incompatible implicit declaration of built-in function    close      Can you please tell me how can I resolve these warnings   Thank you

User · Answer

Try to add next define at start of your  c file    define  GNU SOURCE   It helped me with pipe2 function

User · Answer

A good way to findout what header file you are missing    man  lt section gt   lt function call gt    To find out the section use   apropos  lt function call gt    Example    man 3 memset  man 2 send   Edit in response to James Morris    Section   Description 1    General commands 2    System calls 3    C library functions 4    Special files  usually devices  those found in  dev  and drivers 5    File formats and conventions 6    Games and screensavers 7    Miscellanea 8    System administration commands and daemons   Source  Wikipedia Man Page

User · Answer

memset requires you to import the header string h file  So just add the following header   include  lt string h gt

User · Answer

Old question but I had similar issue and I solved it by adding  extern void  memset void   int  size t     or just  extern void  memset      at the top of translation unit     c file

User · Answer

You need    include  lt string h gt     memset     include  lt unistd h gt     close      in your code   References  POSIX for close  the C standard for memset

[c++] How to resolve compiler warning 'implicit declaration of function memset'

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