C++ output not showing in PHP

Question

i have a small problem, i have a c++ program, but PHP is not showing output, only "blank". I made a small program to test, when I use "printf" and "gcc" to compile, it works fine, but when I compile the same progran using "g++" it fails to show the content in the php page. Any ideas? I can't use "gcc" because my project is in c++

I'm using this version of gcc/g++

g++ (GCC) 4.5.1 20100924 (Red Hat 4.5.1-4)

EDIT: I simplified the problem so you can understand what is going on here, thanks for your help. Now i get a missing library error.

I compiled the files using the followings commands:

gcc -o prueba1 prueba.c
g++ -o prueba2 prueba.cpp

So "prueba1" is the one compiled with GCC and "prueba2" is the one compiled with G++

Here is the file test.php

<?php
      echo "Executing file compiled with GCC <br />"; 
      echo shell_exec("./prueba1");
      echo "<br />";
      echo "Executing file compiled with G++ <br />";
      echo shell_exec("./prueba2 2>&1");
?>

I get this on the browser:

Executing file compiled with GCC
Hello World (GCC) 
Executing file compiled with G++
./prueba2: /opt/lampp/lib/libgcc_s.so.1: version `GCC_4.2.0' not found (required by /usr/lib/libstdc++.so.6)

Here is the prueba.c file:

#include <stdio.h>

int main(int argc, char *argsv[]){

printf("Hello World (GCC)\n");

return(0);

}

Here is the prueba.cpp file:

#include <iostream>

using namespace std;

int main(int argc, char *argsv[]){

cout << "Hello World (G++)" << endl;

return(0);

}

This question makes no sense. You have some C++ source code, which you compile with GCC? What does this have to with PHP? — Oliver Charlesworth
– Oliver Charlesworth, Commented Apr 3, 2011 at 17:58
please show the piece of PHP you use to call your external program. — Mat
– Mat, Commented Apr 3, 2011 at 18:02
what happens when you call the c++ program directly from the command line? where is the source? what are the compiler warnings you're getting? — Mat
– Mat, Commented Apr 3, 2011 at 18:30
@Pace Your problem simply cannot be reproduced. Copying the above files and compiling them with gcc and g++ (using the same version as you) yields exactly the expected output. Try it yourself in a fresh directory. I doubt you’ll be able to reproduce the problem yourself. — Konrad Rudolph
– Konrad Rudolph, Commented Apr 3, 2011 at 19:29

Pace · Accepted Answer · 2011-04-03 23:04:04Z

2

Rename the /opt/lampp/lib/libgcc_s.so.1 to /opt/lampp/lib/libgcc_s.so.1.backup, it seems C++ was trying to access this one instead the one that linux does when running from command line, thanks for the help guys

answered Apr 3, 2011 at 23:04

Pace

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