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git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@3435 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
47 lines
1.9 KiB
XML
47 lines
1.9 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-system-aboutdebug">
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<title>About debugging symbols</title>
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<?dbhtml filename="aboutdebug.html"?>
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<para>Most programs and libraries are, by default, compiled with debugging
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symbols included (with <command>gcc</command>'s <emphasis>-g</emphasis>
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option). This means that, when debugging a program or library that was compiled
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with debugging information included, the debugger can give you not only memory
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addresses but also the names of the routines and variables.</para>
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<para>The inclusion of these debugging symbols, however, enlarges a program or
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library significantly. To get an idea of the amount of space these symbols
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occupy, have a look at the following:</para>
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<itemizedlist>
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<listitem><para>a bash binary
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with debugging symbols: 1200 KB</para></listitem>
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<listitem><para>a bash binary
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without debugging symbols: 480 KB</para></listitem>
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<listitem><para>Glibc and GCC files (/lib and /usr/lib)
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with debugging symbols: 87 MB</para></listitem>
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<listitem><para>Glibc and GCC files
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without debugging symbols: 16 MB</para></listitem>
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</itemizedlist>
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<para>Sizes may vary somewhat, depending on which compiler was used and which C
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library, but when comparing programs with and without debugging symbols the
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difference will generally be a factor between 2 and 5.</para>
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<para>As most people will probably never use a debugger on their system
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software, a lot of disk space can be regained by removing these symbols. For
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your convenience, the next section shows how to strip all debugging symbols
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from all programs and libraries. Information on other ways of optimizing your
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system can be found in the hint at <ulink url="&hints-root;optimization.txt"/>.</para>
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</sect1>
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