Hi All,
Can anybody tell me what's the problem with my simple program calling
clock_gettime() below.
I have tried to compile the app under SuSE 8.1 & RedHad 7.2, but always got
error message like:
In Function 'main': undefined reference to 'clock_gettime'
It's defined in </usr/include/time.h>. Did I miss someting alse? How to fix
it?
Thank you for any hit(s).
--Charlie
----------------------------------------------------------------------------
-------------------
# gcc -o main main.c
main.c:
/*
* This program calculates the time required to
* execute the program specified as its first argument.
* The time is printed in seconds, on standard out.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#define BILLION 1000000000L;
int main( int argc, char** argv )
{
struct timespec start, stop;
double accum;
if( clock_gettime( CLOCK_REALTIME, &start) == -1 ) {
perror( "clock gettime" );
return EXIT_FAILURE;
}
system( argv[1] );
if( clock_gettime( CLOCK_REALTIME, &stop) == -1 ) {
perror( "clock gettime" );
return EXIT_FAILURE;
}
accum = ( stop.tv_sec - start.tv_sec )
+ (double)( stop.tv_nsec - start.tv_nsec )
/ (double)BILLION;
printf( "%lf\n", accum );
return EXIT_SUCCESS;
}
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