Hai friends,

when i include time.h file(/usr/include/time.h),in my program at compilation time i am getting following messages(errors)

I am expecting solution from u


/tmp/cc61O7TY.o(.text+0x10): In function `wait_code':
: undefined reference to `clock_gettime'
/tmp/cc61O7TY.o(.text+0x24): In function `wait_code':
: undefined reference to `timespec_add_ns'
/tmp/cc61O7TY.o(.text+0x36): In function `wait_code':
: undefined reference to `clock_nanosleep'
/tmp/cc61O7TY.o(.text+0x81): In function `wait_code':
: undefined reference to `clock_gettime'
/tmp/cc61O7TY.o(.text+0xa0): In function `wait_code':
: undefined reference to `timespec_add_ns'
/tmp/cc61O7TY.o(.text+0xb2): In function `wait_code':
: undefined reference to `clock_nanosleep'
/tmp/cc61O7TY.o(.text+0x132): In function `lock_code':
: undefined reference to `clock_gettime'
/tmp/cc61O7TY.o(.text+0x151): In function `lock_code':
: undefined reference to `timespec_add_ns'
/tmp/cc61O7TY.o(.text+0x163): In function `lock_code':
: undefined reference to `clock_nanosleep'
/tmp/cc61O7TY.o(.text+0x209): In function `main':
: undefined reference to `rtl_main_wait'
collect2: ld returned 1 exit status


please reply with answer if u know,

thanks and regards,
santhosh.linux@gmail.com

Those are usually defined in #include <sys/time.h> -- normally #include <time.h>
will also find this file

If you have some #define statments elsewhere you may be turning off some of the header files. Read your /usr/include/time.h and see why this is happening.
There are some versions of Linux that require certain #include <xxx> be listed before others, otherwise this can happen. See Marc Rochkind's 'Advanced Unix Programming' for more on this problem.

use "-lrt" to resolve them... (I tried on ubuntu 6.10)

Thanks!vxir is right

I know this is a pretty old thread but the -lrt fix is still correct and needed. I just used it for the same problem in Fedora 11. Even the most recent man pages do not mention this library requirement.

The man-pages for what?
Whenever you include a header, you also have to tell the linker to link to the referenced library which the header is for.

That's the confusing part for many people; you do not always have to do it.

For example, the man page for clock_gettime. Regarding library inclusion based on header names, even if one were sure that a library were needed, the name of that library would not necessarily be obvious from the name of the header file. How would one deduce the library name rt from the header name time.h?

hello can anyone tell me how to solve this problem