Set the compile command

[ecojuntak]

I have finished to install the grader, but I still confused to set the compile command.
I don't know what this part mean /usr/bin/g++ -o [PATH]/source [PATH]/source.cpp -O2 -s -static -lm
and this part [PATH]/source

[fushar]

Hi -- basically you just need to replace the /usr/bin/g++ part to your compiler path. Usually you don't need to do this if you're using Ubuntu and you have installed g++, as it will be installed there by default.

[ecojuntak]

I have replace the usr/bin/g++ part, but it still not work.
I found this error message on the terminal when i try to submit the answer
A PHP Error was encountered Severity: WarningMessage: exec(): Unable to fork [-o secret-68a550951829942d1acd6c2a35519343/7/source/source secret-68a550951829942d1acd6c2a35519343/7/source/source.cpp -O2 -s -static -lm 2>&1]Filename: /var/www/html/grader/application/controllers/Grader.phpLine Number: 169
Are you have solution for this error?

[fushar]

Replace with what? Seems like you're missing it? (Unable to fork [-o ...)

[ecojuntak]

I just delete the /usr/bin/g++ ..

[fushar]

Hmm why? I said replace with your actual compiler path, if necessary

[ecojuntak]

I have locate some path on my PC.
/usr/bin/g++
/usr/bin/g++-4.8
/usr/bin/g++-5
/usr/bin/i686-w64-mingw32-g++
/usr/bin/x86_64-linux-gnu-g++
/usr/bin/x86_64-linux-gnu-g++-4.8
/usr/bin/x86_64-linux-gnu-g++-5
/usr/bin/x86_64-w64-mingw32-g++
I have used /usr/bin/g++ but it still can't work.

[fushar]

What error did you get when you used /usr/bin/g++?

[ecojuntak]

A PHP Error was encountered Severity: WarningMessage: exec(): Unable to fork [/usr/bin/g++ -o secret-68a550951829942d1acd6c2a35519343/13/source/source secret-68a550951829942d1acd6c2a35519343/13/source/source.cpp -O2 -s -static -lm 2>&1]Filename: /var/www/html/grader/application/controllers/Grader.phpLine Number: 169

[fushar]

Hmm strange. Could you try running a very simple PHP file that just contains something like

<?php echo exec('/usr/bin/g++'); ?>

just to test whether your PHP settings is good?

[ecojuntak]

it show nothing

[fushar]

Good. Then try putting some C++ file inside the folder secret-68a550951829942d1acd6c2a35519343 (e.g. test.cpp), and then try compiling that file using the same exec() command, e.g

<?php echo exec('/usr/bin/g++ -o /full/path/to/secret-68a550951829942d1acd6c2a35519343/test /full/path/to/secret-68a550951829942d1acd6c2a35519343/test.cpp'); ?>

use full path for the secret folder

[ecojuntak]

It show nothing too