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POWhy does compiling with <iostream> cause a 500 error on Apache?
 

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  1. POWhy does compiling with <iostream> cause a 500 error on Apache?
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    <p>I'm experimenting with cgi programming in C++ using gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) and I've encountered a strange error when I try to run it on my commercial apache server.</p> <p>Apache will run this once it's compiled:</p> <pre><code>#include &lt;cstdio&gt; // no &lt;iostream&gt; int main(int c, char **argv) { printf("Content-Type: text/html; charset=ISO-8859-1\n\n"); printf("Hello printf\n\n"); return 0; } </code></pre> <p>However, the server gives back a 500 error if <strong>iostream</strong> gets included</p> <pre><code>#include &lt;cstdio&gt; #include &lt;iostream&gt; //this will cause a 500 error int main(int c, char **argv) { printf("Content-Type: text/html; charset=ISO-8859-1\n\n"); printf("Hello printf\n\n"); return 0; } </code></pre> <p>If I compile that second program with iostream, the program will run perfectly from the command line, but if I upload the code, apache starts kicking back 500 Errors.</p> <p>Just for the sake of completeness, I compiled similar programs in both C and Free Pascal as well as C++ using just cstdio. No problems...</p> <p>The problem only arises when I include iostream.</p> <p><em>Note: I didn't forget to change the permissions.</em></p> <p><em>Note: I included "Content-Type: text/html; charset=ISO-8859-1\n\n"</em></p> <p>It's like my server just won't accept something compiled with iostream.</p> <p>Why might <strong>iostream</strong> cause this error when <strong>cstdio</strong> does not and how do I fix it?</p>
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    1. USclay
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    1. CODo you have the same C++ compiler version on your local computer as on the web server? I'm going to guess it's not finding the right C++ library on the server. Perhaps experiment with static linking (ie. add `-static` to the g++ command line) and see if that fixes things in the short run. If so, then you can move on to checking library versions, using tools such as `ldd`.
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      1. POWhy does compiling with <iostream> cause a 500 error on Apache?
      1. USJoe Z
    2. COJoe, that was it. Thank you! Would you put that into an answer so I can choose it.
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    3. COI'm happy to help!
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      1. POWhy does compiling with <iostream> cause a 500 error on Apache?
      1. USJoe Z
 

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