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| <h1 class="settitle">Debugging with GDB</h1> |
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| <h2 class="unnumbered">Summary of <span class="sc">gdb</span></h2> |
| |
| <p>The purpose of a debugger such as <span class="sc">gdb</span> is to allow you to see what is |
| going on “inside” another program while it executes—or what another |
| program was doing at the moment it crashed. |
| |
| <p><span class="sc">gdb</span> can do four main kinds of things (plus other things in support of |
| these) to help you catch bugs in the act: |
| |
| <ul> |
| <li>Start your program, specifying anything that might affect its behavior. |
| |
| <li>Make your program stop on specified conditions. |
| |
| <li>Examine what has happened, when your program has stopped. |
| |
| <li>Change things in your program, so you can experiment with correcting the |
| effects of one bug and go on to learn about another. |
| </ul> |
| |
| <p>You can use <span class="sc">gdb</span> to debug programs written in C and C<tt>++</tt>. |
| For more information, see <a href="Supported-Languages.html#Supported-Languages">Supported Languages</a>. |
| For more information, see <a href="C.html#C">C and C++</a>. |
| |
| <p>Support for D is partial. For information on D, see |
| <a href="D.html#D">D</a>. |
| |
| <p><a name="index-Modula_002d2-1"></a>Support for Modula-2 is partial. For information on Modula-2, see |
| <a href="Modula_002d2.html#Modula_002d2">Modula-2</a>. |
| |
| <p>Support for OpenCL C is partial. For information on OpenCL C, see |
| <a href="OpenCL-C.html#OpenCL-C">OpenCL C</a>. |
| |
| <p><a name="index-Pascal-2"></a>Debugging Pascal programs which use sets, subranges, file variables, or |
| nested functions does not currently work. <span class="sc">gdb</span> does not support |
| entering expressions, printing values, or similar features using Pascal |
| syntax. |
| |
| <p><a name="index-Fortran-3"></a><span class="sc">gdb</span> can be used to debug programs written in Fortran, although |
| it may be necessary to refer to some variables with a trailing |
| underscore. |
| |
| <p><span class="sc">gdb</span> can be used to debug programs written in Objective-C, |
| using either the Apple/NeXT or the GNU Objective-C runtime. |
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