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    <p>While your question is really more general (and only using <code>gcc</code> as an example), my first idea would be to use <code>strace</code> to figure out what it's doing. On my system (Ubuntu 11.10/x64), I just ran <code>strace</code>, like so:</p> <pre><code>strace -F -o sout gcc -Wall -o test test.c </code></pre> <p>This shows system calls for the <code>gcc</code> process, while following forks (<code>-F</code>) and sending the output of the trace to <code>sout</code>. Doing this, I can see that <code>gcc</code> here calls <code>vfork()</code>, and then <code>execve()</code> in the child, though the actual program's source might just do a simple <code>fork()</code>/<code>exec()</code>.</p> <p>The relevant output from <code>sout</code> is:</p> <pre><code>26264 stat("/usr/lib/gcc/x86_64-linux-gnu/4.6.1/cc1", {st_mode=S_IFREG|0755, st_size=11248824, ...}) = 0 26264 access("/usr/lib/gcc/x86_64-linux-gnu/4.6.1/cc1", X_OK) = 0 26264 vfork() = 26265 26264 wait4(26265, &lt;unfinished ...&gt; 26265 execve("/usr/lib/gcc/x86_64-linux-gnu/4.6.1/cc1", ["/usr/lib/gcc/x86_64-linux-gnu/4."..., "-quiet", "-imultilib", ".", "-imultiarch", "x86_64-linux-gnu", "test.c", "-quiet", "-dumpbase", "test.c", "-mtune=generic", "-march=x86-64", "-auxbase", "test", "-Wall", "-fstack-protector", ...], [/* 46 vars */]) = 0 </code></pre> <p>At the begnning of each line is the pid of the process running. So the primary process calls <code>stat()</code> to find <code>cc1</code>, then forks, and the child executes it.</p> <p>That being said, I could have answered your question without the citation; fork/exec is a common way to call sub-processes from your program.</p>
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    1. POHow does GCC run its other programs?
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    1. USDan Fego
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    1. POHow does GCC run its other programs?
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    1. COI didn't even think of strace, I'm not a Linux person. Yeah the question really is kind of general. Thank you!
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