1 | <?xml version="1.0" encoding="UTF-8"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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5 | %general-entities;
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6 |
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7 | <!ENTITY gdb-download-http "&gnu-http;/gdb/gdb-&gdb-version;.tar.xz">
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8 | <!ENTITY gdb-download-ftp " ">
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9 | <!ENTITY gdb-md5sum "85c722e2f2baea2b7820a6a7eaea2ce8">
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10 | <!ENTITY gdb-size "23 MB">
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11 | <!ENTITY gdb-buildsize "823 MB (add 788 MB for docs; add 738 MB for tests)">
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12 | <!ENTITY gdb-time "0.9 SBU (add 0.4 SBU for docs; add 6.3 SBU tests; all using parallelism=8)">
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13 | ]>
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14 |
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15 | <sect1 id="gdb" xreflabel="GDB-&gdb-version;">
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16 | <?dbhtml filename="gdb.html"?>
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17 |
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18 |
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19 | <title>GDB-&gdb-version;</title>
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20 |
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21 | <indexterm zone="gdb">
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22 | <primary sortas="a-GDB">GDB</primary>
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23 | </indexterm>
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24 |
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25 | <sect2 role="package">
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26 | <title>Introduction to GDB</title>
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27 |
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28 | <para>
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29 | <application>GDB</application>, the GNU Project debugger, allows you
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30 | to see what is going on <quote>inside</quote> another program while it
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31 | executes -- or what another program was doing at the moment it crashed.
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32 | Note that <application>GDB</application> is most effective when tracing
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33 | programs and libraries that were built with debugging symbols and not
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34 | stripped.
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35 | </para>
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36 |
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37 | &lfs122_checked;
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38 |
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39 | <bridgehead renderas="sect3">Package Information</bridgehead>
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40 | <itemizedlist spacing="compact">
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41 | <listitem>
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42 | <para>
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43 | Download (HTTP): <ulink url="&gdb-download-http;"/>
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44 | </para>
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45 | </listitem>
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46 | <listitem>
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47 | <para>
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48 | Download (FTP): <ulink url="&gdb-download-ftp;"/>
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49 | </para>
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50 | </listitem>
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51 | <listitem>
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52 | <para>
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53 | Download MD5 sum: &gdb-md5sum;
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54 | </para>
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55 | </listitem>
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56 | <listitem>
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57 | <para>
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58 | Download size: &gdb-size;
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59 | </para>
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60 | </listitem>
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61 | <listitem>
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62 | <para>
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63 | Estimated disk space required: &gdb-buildsize;
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64 | </para>
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65 | </listitem>
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66 | <listitem>
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67 | <para>
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68 | Estimated build time: &gdb-time;
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69 | </para>
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70 | </listitem>
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71 | </itemizedlist>
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72 | <!--
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73 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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74 | <itemizedlist spacing="compact">
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75 | <listitem>
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76 | <para>
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77 | Required patch:
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78 | <ulink url="&patch-root;/gdb-&gdb-version;-upstream_fixes-1.patch"/>
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79 | </para>
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80 | </listitem>
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81 | </itemizedlist>
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82 | -->
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83 | <bridgehead renderas="sect3">GDB Dependencies</bridgehead>
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84 |
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85 | <bridgehead renderas="sect4">Recommended Runtime Dependency</bridgehead>
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86 | <para role="recommended">
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87 | <xref linkend="six"/> (Python 3 module, required at run-time to
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88 | use GDB scripts from various LFS/BLFS packages with Python 3
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89 | installed in LFS)
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90 | </para>
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91 |
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92 | <bridgehead renderas="sect4">Optional</bridgehead>
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93 | <para role="optional">
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94 | <xref linkend="doxygen"/>,
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95 | <xref linkend="gcc"/> (ada, gfortran, and go are used for tests),
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96 | <xref linkend="guile"/>,
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97 | <xref linkend="rust"/> (used for some tests),
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98 | <xref linkend="valgrind"/>, and
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99 | <ulink url="https://sourceware.org/systemtap/">SystemTap</ulink>
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100 | (run-time, used for tests)
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101 | </para>
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102 |
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103 | </sect2>
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104 |
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105 | <sect2 role="installation">
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106 | <title>Installation of GDB</title>
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107 | <!--
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108 | <para>
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109 | First, apply a patch that fixes problems when debugging programs compiled
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110 | with <xref linkend="rust" role="nodep"/>:
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111 | </para>
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112 |
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113 | <screen><userinput remap="pre">patch -Np1 -i ../gdb-&gdb-version;-upstream_fixes-1.patch</userinput></screen>
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114 | -->
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115 | <para>
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116 | Install <application>GDB</application> by running the following
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117 | commands:
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118 | </para>
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119 |
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120 | <screen><userinput>mkdir build &&
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121 | cd build &&
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122 |
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123 | ../configure --prefix=/usr \
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124 | --with-system-readline \
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125 | --with-python=/usr/bin/python3 &&
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126 | make</userinput></screen>
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127 |
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128 | <para>
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129 | Optionally, to build the API documentation using
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130 | <xref linkend="doxygen"/>, run:
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131 | </para>
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132 |
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133 | <screen remap="doc"><userinput>make -C gdb/doc doxy</userinput></screen>
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134 |
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135 | <para>
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136 | Running the tests is not recommended. The results vary a lot depending
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137 | on the system architecture and what optional dependencies are installed
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138 | and what version of gcc is being used. On one system tested, there were
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139 | 140 unexpected failures (out of over 108,000 tests) and on another system
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140 | there were "only" 32 unexpected failures. The time to run the tests
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141 | varies from approximately 6 SBU to over 15 SBU when using -j8. This depends
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142 | on number of tests that time out as well as other factors.
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143 | </para>
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144 |
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145 | <tip>
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146 | <para>
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147 | With a plain <command>make check</command>, there are many warning
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148 | messages about a missing global configuration file. These can be
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149 | avoided by running <command>touch global.exp</command> and prepending
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150 | the <command>make check</command> command with
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151 | <command>DEJAGNU=$PWD/global.exp</command>. In addition the tests can
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152 | be speeded up considerably by using the <command>make</command> option
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153 | "-j<N>" where <N> is the number of cores on your system.
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154 | </para>
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155 | </tip>
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156 |
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157 | <para>
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158 | To test the results anyway, issue:
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159 | </para>
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160 |
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161 | <screen remap="test"><userinput>pushd gdb/testsuite &&
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162 | make site.exp &&
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163 | echo "set gdb_test_timeout 30" >> site.exp &&
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164 | make check 2>1 | tee gdb-check.log
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165 | popd</userinput></screen>
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166 |
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167 | <para>
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168 | See <emphasis>gdb/testsuite/README</emphasis> and <ulink
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169 | url="https://sourceware.org/gdb/wiki/TestingGDB">TestingGDB</ulink>.
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170 | There are many additional problems with the test suite:
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171 | </para>
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172 |
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173 | <itemizedlist>
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174 | <listitem>
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175 | <para>
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176 | Clean directories are needed if re-running the tests. For that
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177 | reason, make a copy of the compiled source code
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178 | directory before the tests in case you need to run the tests again.
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179 | </para>
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180 | </listitem>
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181 |
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182 | <listitem>
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183 | <para>
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184 | Results depend on installed compilers.
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185 | </para>
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186 | </listitem>
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187 | <!-- I did not see this
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188 | <listitem>
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189 | <para>
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190 | There are a large number of timeouts (there is a variable
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191 | that can be set to increase time for timeout, but
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192 | changing it will result in a different number of tests being
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193 | run).
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194 | </para>
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195 | </listitem>
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196 | or this
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197 | <listitem>
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198 | <para>
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199 | There are failures associated with system readline 6.x.
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200 | </para>
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201 | </listitem>
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202 | -->
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203 | <!--
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204 | <listitem>
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205 | <para>
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206 | A few tests assume that the header file
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207 | <filename><sys/sdt.h></filename>, part of <ulink
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208 | url="https://sourceware.org/systemtap/">SystemTap</ulink>, is
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209 | present.
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210 | </para>
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211 | </listitem>
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212 | -->
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213 | <!-- I don't know if this is true or not. I tested on a Haswell.
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214 | <listitem>
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215 | <para>
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216 | If the test suite is run on a Skylake-based Intel CPU or newer,
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217 | many tests will fail due to the removal of the deprecated/problematic
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218 | libmpx library in GCC.
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219 | </para>
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220 | </listitem>
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221 | -->
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222 | <!-- <listitem>
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223 | <para>
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224 | -->
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225 | <!-- for gdb-11.1, gcc-11.2 - pierre
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226 | A test run of the test suite had about 1700 unexpected failures
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227 | (out of over 80000 tests). Over 1370 of the failures were related
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228 | to FORTRAN tests. -->
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229 | <!-- for gdb-12.1, gcc-11.3.0 - bdubbs
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230 | A test run of the test suite had a little over 200 unexpected failures
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231 | out of over 94000 tests.-->
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232 | <!-- for gdb-13.0, gcc-12.2.0 - bdubbs
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233 | A test run of the test suite had 33 unexpected failures
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234 | out of over 106000 tests. -->
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235 | <!-- for gdb-13.2, gcc-13.1.0 - pierre
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236 | A test run of the test suite had 183 unexpected failures
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237 | out of over 105000 tests. -->
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238 | <!-- for gdb-14.1, gcc 13.2.0 - rahul -->
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239 | <!-- A test run of the test suite had 51 unexpected failures
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240 | out of the over 106000 tests.
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241 | </para>
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242 | </listitem>
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243 |
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244 | <listitem>
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245 | <para>
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246 | On some systems, the gdb.tui test suite will fail if running over
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247 | SSH.
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248 | </para>
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249 | </listitem>
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250 | -->
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251 | <listitem>
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252 | <para>
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253 | On some AMD-based systems, over 200 additional tests
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254 | may fail due to a difference in the threading implementation
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255 | on those CPUs.
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256 | </para>
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257 | </listitem>
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258 |
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259 | <listitem>
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260 | <para>
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261 | For gdb-15.2, using an Intel i7-14700K, there were 118 unexpected failures
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262 | out of over 116,000 tests.
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263 | </para>
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264 | </listitem>
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265 |
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266 | </itemizedlist>
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267 |
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268 | <para>
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269 | Now, as the <systemitem class="username">root</systemitem> user:
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270 | </para>
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271 |
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272 | <screen role="root"><userinput>make -C gdb install &&
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273 | make -C gdbserver install</userinput></screen>
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274 |
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275 | <para>
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276 | If you have built the API documentation, it is now in gdb/doc/doxy.
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277 | You can install it (as the <systemitem class="username">root</systemitem>
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278 | user):
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279 | </para>
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280 |
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281 | <screen role="root"
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282 | remap="doc"><userinput>install -d /usr/share/doc/gdb-&gdb-version; &&
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283 | rm -rf gdb/doc/doxy/xml &&
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284 | cp -Rv gdb/doc/doxy /usr/share/doc/gdb-&gdb-version;</userinput></screen>
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285 |
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286 | </sect2>
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287 |
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288 | <sect2 role="commands">
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289 | <title>Command Explanations</title>
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290 |
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291 | <para>
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292 | <parameter>--with-system-readline</parameter>: This switch forces
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293 | <application>GDB</application> to use the copy of
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294 | <application>Readline</application> installed in LFS.
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295 | </para>
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296 |
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297 | <para>
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298 | <parameter>--with-python=/usr/bin/python3</parameter>: This switch
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299 | forces <application>GDB</application> to use Python 3.
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300 | </para>
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301 |
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302 | </sect2>
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303 |
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304 | <sect2 role="content">
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305 | <title>Contents</title>
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306 |
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307 | <segmentedlist>
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308 | <segtitle>Installed Programs</segtitle>
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309 | <segtitle>Installed Library</segtitle>
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310 | <segtitle>Installed Directories</segtitle>
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311 |
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312 | <seglistitem>
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313 | <seg>
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314 | gcore, gdb, gdbserver, and gdb-add-index
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315 | </seg>
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316 | <seg>
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317 | libinproctrace.so
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318 | </seg>
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319 | <seg>
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320 | /usr/{include,share}/gdb and /usr/share/doc/gdb-&gdb-version;
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321 | </seg>
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322 | </seglistitem>
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323 | </segmentedlist>
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324 |
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325 | <variablelist>
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326 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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327 | <?dbfo list-presentation="list"?>
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328 | <?dbhtml list-presentation="table"?>
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329 |
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330 | <varlistentry id="gcore">
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331 | <term><command>gcore</command></term>
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332 | <listitem>
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333 | <para>
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334 | generates a core dump of a running program
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335 | </para>
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336 | <indexterm zone="gdb gcore">
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337 | <primary sortas="b-gcore">gcore</primary>
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338 | </indexterm>
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339 | </listitem>
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340 | </varlistentry>
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341 |
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342 | <varlistentry id="gdb-prog">
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343 | <term><command>gdb</command></term>
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344 | <listitem>
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345 | <para>
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346 | is the GNU Debugger
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347 | </para>
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348 | <indexterm zone="gdb gdb-prog">
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349 | <primary sortas="b-gdb-prog">gdb-prog</primary>
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350 | </indexterm>
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351 | </listitem>
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352 | </varlistentry>
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353 |
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354 | <varlistentry id="gdbserver">
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355 | <term><command>gdbserver</command></term>
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356 | <listitem>
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357 | <para>
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358 | is a remote server for the GNU debugger (it allows programs
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359 | to be debugged from a different machine)
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360 | </para>
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361 | <indexterm zone="gdb gdbserver">
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362 | <primary sortas="b-gdbserver">gdbserver</primary>
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363 | </indexterm>
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364 | </listitem>
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365 | </varlistentry>
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366 |
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367 | <varlistentry id="gdb-add-index">
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368 | <term><command>gdb-add-index</command></term>
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369 | <listitem>
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370 | <para>
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371 | Allows adding index files to ELF binaries. This speeds up
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372 | <command>gdb</command> start on large programs.
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373 | </para>
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374 | <indexterm zone="gdb gdb-add-index">
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375 | <primary sortas="b-gdb-add-index">gdb-add-index</primary>
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376 | </indexterm>
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377 | </listitem>
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378 | </varlistentry>
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379 |
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380 | <varlistentry id="libinproctrace">
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381 | <term><filename class="libraryfile">libinproctrace.so</filename></term>
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382 | <listitem>
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383 | <para>
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384 | contains functions for the in-process tracing agent. The agent
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385 | allows for installing fast tracepoints, listing static tracepoint
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386 | markers, probing static tracepoints markers, and starting trace
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387 | monitoring.
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388 | </para>
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389 | <indexterm zone="gdb libinproctrace">
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390 | <primary sortas="c-libinproctrace">libinproctrace.so</primary>
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391 | </indexterm>
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392 | </listitem>
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393 | </varlistentry>
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394 |
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395 | </variablelist>
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396 |
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397 | </sect2>
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398 |
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399 | </sect1>
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