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diff --git a/chapter06/aboutdebug.xml b/chapter06/aboutdebug.xml new file mode 100644 index 000000000..5cecada9c --- /dev/null +++ b/chapter06/aboutdebug.xml @@ -0,0 +1,53 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" + "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [ + <!ENTITY % general-entities SYSTEM "../general.ent"> + %general-entities; +]> + +<sect1 id="ch-system-aboutdebug"> + <?dbhtml filename="aboutdebug.html"?> + + <title>About Debugging Symbols</title> + + <para>Most programs and libraries are, by default, compiled with + debugging symbols included (with <command>gcc</command>'s + <parameter>-g</parameter> option). This means that when debugging a + program or library that was compiled with debugging information + included, the debugger can provide not only memory addresses, but also + the names of the routines and variables.</para> + + <para>However, the inclusion of these debugging symbols enlarges a + program or library significantly. The following is an example of the + amount of space these symbols occupy:</para> + + <itemizedlist> + <listitem> + <para>A <command>bash</command> binary with debugging symbols: + 1200 KB</para> + </listitem> + <listitem> + <para>A <command>bash</command> binary without debugging symbols: + 480 KB</para> + </listitem> + <listitem> + <para>Glibc and GCC files (<filename class="directory">/lib</filename> + and <filename class="directory">/usr/lib</filename>) with debugging + symbols: 87 MB</para> + </listitem> + <listitem> + <para>Glibc and GCC files without debugging symbols: 16 MB</para> + </listitem> + </itemizedlist> + + <para>Sizes may vary depending on which compiler and C library were used, + but when comparing programs with and without debugging symbols, the + difference will usually be a factor between two and five.</para> + + <para>Because most users will never use a debugger on their system software, + a lot of disk space can be regained by removing these symbols. The next + section shows how to strip all debugging symbols from the programs and + libraries. Additional information on system optimization can be found at + <ulink url="&hints-root;optimization.txt"/>.</para> + +</sect1> |