mirror of https://github.com/tLDP/LDP
51 lines
1.9 KiB
XML
51 lines
1.9 KiB
XML
<sect1 id="ch06-aboutdebug">
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<title>About debugging symbols</title>
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<?dbhtml filename="aboutdebug.html" dir="chapter06"?>
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<para>Most programs and libraries are, by default, compiled with debugging
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symbols included (with gcc option -g).</para>
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<para>When debugging a program or library that was compiled with debugging
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information included, the debugger can give you not only memory addresses
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but also the names of the routines and variables.</para>
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<para>But the inclusion of these debugging symbols 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 a little, depending on which compiler was used and
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which C library. But when comparing programs with and without debugging
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symbols, the 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 .</para>
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<para>To remove debugging symbols from a binary (which must be an a.out
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or ELF binary), run <userinput>strip --strip-debug filename</userinput>.
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Wildcards can be used to treat multiple files (use something like
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<userinput>strip --strip-debug $LFS/tools/bin/*</userinput>).</para>
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<para>For your convenience, <xref linkend="chapter09"/> includes one simple
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command to strip all debugging symbols from all programs and libraries on your
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system. Additional information on optimization can be found in the hint at
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<ulink url="&hints-root;optimization.txt"/>.</para>
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</sect1>
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