Need to fix an error when compiling ctime library. clock_gettime and CLOCK

I'm calling clock_gettime with CLOCK_REALTIME to measure the time elapsed for a program of mine. The code is like this:

clock_gettime(CLOCK_REALTIME, &start);

int retCode = system(completeString.c_str());

clock_gettime(CLOCK_REALTIME, &finish);

and it gives me this errors when i try to compile it with
gcc -lrt -o timeSpent.exe time.cpp:

time.cpp: In function 'int main(int, char**)':

time.cpp:38:18: error: 'CLOCK_REALTIME' was not declared in this scope
clock_gettime(CLOCK_REALTIME, &start);

time.cpp:38:40: error: 'clock_gettime' was not declared in this scope
clock_gettime(CLOCK_REALTIME, &start);

Header files:

#include <iostream>

#include <sstream>

#include <fstream>

#include <ctime>

#include <Windows.h>

Compiler: MinGW

I hope one of you guys is able to help me fix this problem, and i'm grateful for anyone who tries to help.

Ps: I'm using Windows 10, but i have been successful on compiling this same code before on a Win10 PC. Unfortunately i can't access it, since I'm in another country.

Ps²: I've already tried to #define _POSIX_C_SOURCE 199309L, the only thing it does is add a warning.

edited Jan 1 at 23:02

asked Jan 1 at 22:15

Nicholas Lopes

Which header files are you including? Which compiler are you using? Also, that isn't a C++ Standard Library function..

– Neil Butterworth
Jan 1 at 22:19

You should see the answer here

– tunglt
Jan 1 at 22:51

@NeilButterworth, i edited the post with the information you asked.

– Nicholas Lopes
Jan 1 at 23:04

@tunglt i tried out the clock_gettime from the post you shared, and one from Carl Staelin worked out, but it still doesn't fix the CLOCK_REALTIME or CLOCK_MONOTONIC issue. Any insights? Thanks for your help <3

– Nicholas Lopes
Jan 1 at 23:05

1

Do you add #define _POSIX_C_SOURCE 199309L before including the header file #include <time.h> ?

– tunglt
Jan 1 at 23:15

|
show 2 more comments

I'm calling clock_gettime with CLOCK_REALTIME to measure the time elapsed for a program of mine. The code is like this:

clock_gettime(CLOCK_REALTIME, &start);

int retCode = system(completeString.c_str());

clock_gettime(CLOCK_REALTIME, &finish);

and it gives me this errors when i try to compile it with
gcc -lrt -o timeSpent.exe time.cpp:

time.cpp: In function 'int main(int, char**)':

time.cpp:38:18: error: 'CLOCK_REALTIME' was not declared in this scope
clock_gettime(CLOCK_REALTIME, &start);

time.cpp:38:40: error: 'clock_gettime' was not declared in this scope
clock_gettime(CLOCK_REALTIME, &start);

Header files:

#include <iostream>

#include <sstream>

#include <fstream>

#include <ctime>

#include <Windows.h>

Compiler: MinGW

I hope one of you guys is able to help me fix this problem, and i'm grateful for anyone who tries to help.

Ps: I'm using Windows 10, but i have been successful on compiling this same code before on a Win10 PC. Unfortunately i can't access it, since I'm in another country.

Ps²: I've already tried to #define _POSIX_C_SOURCE 199309L, the only thing it does is add a warning.

edited Jan 1 at 23:02

asked Jan 1 at 22:15

Nicholas Lopes

Which header files are you including? Which compiler are you using? Also, that isn't a C++ Standard Library function..

– Neil Butterworth
Jan 1 at 22:19

You should see the answer here

– tunglt
Jan 1 at 22:51

@NeilButterworth, i edited the post with the information you asked.

– Nicholas Lopes
Jan 1 at 23:04

@tunglt i tried out the clock_gettime from the post you shared, and one from Carl Staelin worked out, but it still doesn't fix the CLOCK_REALTIME or CLOCK_MONOTONIC issue. Any insights? Thanks for your help <3

– Nicholas Lopes
Jan 1 at 23:05

1

Do you add #define _POSIX_C_SOURCE 199309L before including the header file #include <time.h> ?

– tunglt
Jan 1 at 23:15

|
show 2 more comments

I'm calling clock_gettime with CLOCK_REALTIME to measure the time elapsed for a program of mine. The code is like this:

clock_gettime(CLOCK_REALTIME, &start);

int retCode = system(completeString.c_str());

clock_gettime(CLOCK_REALTIME, &finish);

and it gives me this errors when i try to compile it with
gcc -lrt -o timeSpent.exe time.cpp:

time.cpp: In function 'int main(int, char**)':

time.cpp:38:18: error: 'CLOCK_REALTIME' was not declared in this scope
clock_gettime(CLOCK_REALTIME, &start);

time.cpp:38:40: error: 'clock_gettime' was not declared in this scope
clock_gettime(CLOCK_REALTIME, &start);

Header files:

#include <iostream>

#include <sstream>

#include <fstream>

#include <ctime>

#include <Windows.h>

Compiler: MinGW

I hope one of you guys is able to help me fix this problem, and i'm grateful for anyone who tries to help.

Ps: I'm using Windows 10, but i have been successful on compiling this same code before on a Win10 PC. Unfortunately i can't access it, since I'm in another country.

Ps²: I've already tried to #define _POSIX_C_SOURCE 199309L, the only thing it does is add a warning.

edited Jan 1 at 23:02

asked Jan 1 at 22:15

Nicholas Lopes

I'm calling clock_gettime with CLOCK_REALTIME to measure the time elapsed for a program of mine. The code is like this:

clock_gettime(CLOCK_REALTIME, &start);

int retCode = system(completeString.c_str());

clock_gettime(CLOCK_REALTIME, &finish);

and it gives me this errors when i try to compile it with
gcc -lrt -o timeSpent.exe time.cpp:

time.cpp: In function 'int main(int, char**)':

time.cpp:38:18: error: 'CLOCK_REALTIME' was not declared in this scope
clock_gettime(CLOCK_REALTIME, &start);

time.cpp:38:40: error: 'clock_gettime' was not declared in this scope
clock_gettime(CLOCK_REALTIME, &start);

Header files:

#include <iostream>

#include <sstream>

#include <fstream>

#include <ctime>

#include <Windows.h>

Compiler: MinGW

I hope one of you guys is able to help me fix this problem, and i'm grateful for anyone who tries to help.

Ps: I'm using Windows 10, but i have been successful on compiling this same code before on a Win10 PC. Unfortunately i can't access it, since I'm in another country.

Ps²: I've already tried to #define _POSIX_C_SOURCE 199309L, the only thing it does is add a warning.

c++ time ctime

edited Jan 1 at 23:02

asked Jan 1 at 22:15

Nicholas Lopes

edited Jan 1 at 23:02

asked Jan 1 at 22:15

Nicholas Lopes

edited Jan 1 at 23:02

asked Jan 1 at 22:15

Nicholas Lopes

asked Jan 1 at 22:15

Nicholas Lopes

asked Jan 1 at 22:15

Nicholas Lopes

Which header files are you including? Which compiler are you using? Also, that isn't a C++ Standard Library function..

– Neil Butterworth
Jan 1 at 22:19

You should see the answer here

– tunglt
Jan 1 at 22:51

@NeilButterworth, i edited the post with the information you asked.

– Nicholas Lopes
Jan 1 at 23:04

@tunglt i tried out the clock_gettime from the post you shared, and one from Carl Staelin worked out, but it still doesn't fix the CLOCK_REALTIME or CLOCK_MONOTONIC issue. Any insights? Thanks for your help <3

– Nicholas Lopes
Jan 1 at 23:05

1

Do you add #define _POSIX_C_SOURCE 199309L before including the header file #include <time.h> ?

– tunglt
Jan 1 at 23:15

|
show 2 more comments

Which header files are you including? Which compiler are you using? Also, that isn't a C++ Standard Library function..

– Neil Butterworth
Jan 1 at 22:19

You should see the answer here

– tunglt
Jan 1 at 22:51

@NeilButterworth, i edited the post with the information you asked.

– Nicholas Lopes
Jan 1 at 23:04

@tunglt i tried out the clock_gettime from the post you shared, and one from Carl Staelin worked out, but it still doesn't fix the CLOCK_REALTIME or CLOCK_MONOTONIC issue. Any insights? Thanks for your help <3

– Nicholas Lopes
Jan 1 at 23:05

1

Do you add #define _POSIX_C_SOURCE 199309L before including the header file #include <time.h> ?

– tunglt
Jan 1 at 23:15

Which header files are you including? Which compiler are you using? Also, that isn't a C++ Standard Library function..

– Neil Butterworth
Jan 1 at 22:19

You should see the answer here

– tunglt
Jan 1 at 22:51

@NeilButterworth, i edited the post with the information you asked.

– Nicholas Lopes
Jan 1 at 23:04

@tunglt i tried out the clock_gettime from the post you shared, and one from Carl Staelin worked out, but it still doesn't fix the CLOCK_REALTIME or CLOCK_MONOTONIC issue. Any insights? Thanks for your help <3

– Nicholas Lopes
Jan 1 at 23:05

Do you add #define _POSIX_C_SOURCE 199309L before including the header file #include <time.h> ?

– tunglt
Jan 1 at 23:15

|
show 2 more comments

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