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| 22 | <title>Compile Example (GNU C Language Manual)</title>
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| 57 | <body lang="en">
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| 58 | <span id="Compile-Example"></span><div class="header">
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| 59 | <p>
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| 60 | Previous: <a href="Complete-Line_002dby_002dLine.html" accesskey="p" rel="prev">Complete Line-by-Line</a>, Up: <a href="Complete-Program.html" accesskey="u" rel="up">Complete Program</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Symbol-Index.html" title="Index" rel="index">Index</a>]</p>
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| 61 | </div>
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| 62 | <hr>
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| 63 | <span id="Compiling-the-Example-Program"></span><h3 class="section">2.4 Compiling the Example Program</h3>
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| 64 | <span id="index-compiling"></span>
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| 65 | <span id="index-executable-file"></span>
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| 66 |
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| 67 | <p>To run a C program requires converting the source code into an
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| 68 | <em>executable file</em>. This is called <em>compiling</em> the program,
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| 69 | and the command to do that using GNU C is <code>gcc</code>.
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| 70 | </p>
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| 71 | <p>This example program consists of a single source file. If we
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| 72 | call that file <samp>fib1.c</samp>, the complete command to compile it is
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| 73 | this:
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| 74 | </p>
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| 75 | <div class="example">
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| 76 | <pre class="example">gcc -g -O -o fib1 fib1.c
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| 77 | </pre></div>
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| 78 |
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| 79 | <p>Here, <samp>-g</samp> says to generate debugging information, <samp>-O</samp>
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| 80 | says to optimize at the basic level, and <samp>-o fib1</samp> says to put
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| 81 | the executable program in the file <samp>fib1</samp>.
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| 82 | </p>
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| 83 | <p>To run the program, use its file name as a shell command.
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| 84 | For instance,
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| 85 | </p>
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| 86 | <div class="example">
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| 87 | <pre class="example">./fib1
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| 88 | </pre></div>
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| 89 |
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| 90 | <p>However, unless you are sure the program is correct, you should
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| 91 | expect to need to debug it. So use this command,
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| 92 | </p>
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| 93 | <div class="example">
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| 94 | <pre class="example">gdb fib1
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| 95 | </pre></div>
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| 96 |
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| 97 | <p>which starts the GDB debugger (see <a href="https://sourceware.org/gdb/current/onlinedocs/gdb/Sample-Session.html#Sample-Session">A Sample GDB Session</a> in <cite>Debugging with GDB</cite>) so you can run and
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| 98 | debug the executable program <code>fib1</code>.
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| 99 | </p>
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| 100 |
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| 101 | <p>See <a href="Compilation.html">Compilation</a>, for an introduction to compiling more complex
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| 102 | programs which consist of more than one source file.
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| 103 | </p>
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| 104 |
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| 105 |
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| 106 |
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| 107 | </body>
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