WIFCONTINUED not recognised - c

Question

I'm writing a C program and GCC doesn't recognise WIFCONTINUED. I've included the library that contains it (sys/wait.h) and checked that the library does exist on my machine.
My program:
#include <stdio.h>
#include <linux/limits.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include "LineParser.h"
//Some code...
if(WIFCONTINUED(status)){
temp->status = RUNNING;
}
//More code...
The error I get when I compile is:
warning: implicit declaration of function ‘WIFCONTINUED’; did you mean ‘__W_CONTINUED’? [-Wimplicit-function-declaration]
else if(WIFCONTINUED(status)){
^~~~~~~~~~~~
__W_CONTINUED
undefined reference to `WIFCONTINUED'
collect2: error: ld returned 1 exit status
Has anyone experienced a similar problem with WIFCONTINUED?
EDIT:
Here is some example(not my original program) that failes to compile with the same errros:
#include <stdio.h>
#include <linux/limits.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
int main(int argc,char** argv){
int status;
if(WIFCONTINUED(status)){
printf("Works");
}
return 0;
}
My OS is Ubuntu 18.04 and my makefile is:
all: rep
rep: rep.o
gcc -g -Wall -m32 rep.o -o rep
rep.o: rep.c
gcc -g -Wall -m32 -ansi -c -o rep.o rep.c
.PHONY : clean
clean :
-rm -f *.o

Answer 1

The cause is the -ansi flag. It's equivalent to -std=c90 and WIFCONTINUED is not part of the C standard.
Most of the system programming headers you have included are from POSIX. So -ansi isn't going to help with anything at all. Just dropping the flag -ansi would be sufficient to fix this.