How to fix implicit declaration of function?

How to fix implicit declaration of function?

By : Luis
Date : October 16 2020, 06:10 AM
wish helps you I am a complete beginner and have been taking youtube lessons on C. However I am stuck with a very basic error (I assume) and would appreciate an explanation of why I am getting this error: , Declare SayHi function before you call it.
code :
#include <stdio.h>
#include <stdlib.h>

void sayHi(); //declartion of the function

int main()
return 0;

void sayHi()
printf("Hello User");

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implicit declaration of function ‘str[n]casecmp’ [-Werror=implicit-function-declaration]

implicit declaration of function ‘str[n]casecmp’ [-Werror=implicit-function-declaration]

By : Jose Rodriguez
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I am compiling a C library, using C99. I am including string.h to my translation unit (and I can navigate to the definitions of the str?casecmp functions in my netbeans IDE. , These functions are declared in strings.h, not string.h.
error: implicit declaration of function 'create_proc_read_entry' [-Werror=implicit-function-declaration]

error: implicit declaration of function 'create_proc_read_entry' [-Werror=implicit-function-declaration]

By : user2393568
Date : March 29 2020, 07:55 AM
around this issue The error is because you are not including explicitly the header that declares the function and the compiler is 'including' implicitily for you and this throws a warning. The flag '-Werror' is making the compiler treats the warning as an error. Try adding: #include
Also: create_proc_read_entry is a deprecated function.
error: implicit declaration of function 'rdtscl' [-Werror=implicit-function-declaration] (but no error when running on o

error: implicit declaration of function 'rdtscl' [-Werror=implicit-function-declaration] (but no error when running on o

By : MahD
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The website elixir.bootlin.com is pretty useful for these things. The following link is a search across the entire kernel sources tree for version 3.10.108 for the symbol rdtscl.
ebtables.c:61:3: error: implicit declaration of function 'xt_compat_calc_jump' [-Werror=implicit-function-declaration]

ebtables.c:61:3: error: implicit declaration of function 'xt_compat_calc_jump' [-Werror=implicit-function-declaration]

By : user2959364
Date : March 29 2020, 07:55 AM
To fix the issue you can do I resolved this issue by replacing the source in the include directory of this project with the include directory of another project.
I replaced the source with the source from this directory:
error: implicit declaration of function 'execl' [-Werror=implicit-function-declaration]

error: implicit declaration of function 'execl' [-Werror=implicit-function-declaration]

By : Tamás Gerencsér
Date : March 29 2020, 07:55 AM
I hope this helps . execl is provided by libc, which is user-mode. In addition, exec functions replace the current process, but that context in the kernel doesn't really have a "current process" you'd want to be replacing.
The correct way to do this would be through a udev rule. If you really don't want to use udev for some reason, you can use the usermode helper API (example).
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