使用CC编译器（Solaris）时链接unistd.h

Question

I need to link <unistd.h> in my program using CC compiler on Solaris. When I needed to link <math.h> or <curses.h> I just used Google to find -lm and -lcurses flags but this time Google didn't help. How to find out in which lib*something* is <unistd.h> located?

Answer 1

For any given function, the man page tells you both what headers to include and what libraries to link.

For example, the ceil function :

Synopsis

 c99 [ flag... ] file... -lm [ library... ] #include <math.h> double ceil(double x); float ceilf(float x); long double ceill(long double x); 

It tells you to #include <math.h> and to link with -lm .

Most functions declared in <unistd.h> don't require any additional libraries to link in, but when in doubt check the man pages.