1 <section xmlns="http://docbook.org/ns/docbook" version="5.0" 2 xml:id="manual.intro.setup.prereq" xreflabel="Prerequisites"> 3 <?dbhtml filename="prerequisites.html"?> 4 5 <info><title>Prerequisites</title> 6 <keywordset> 7 <keyword>ISO C++</keyword> 8 <keyword>Prerequisites</keyword> 9 </keywordset> 10 </info> 11 12 13 14 <para> 15 Because libstdc++ is part of GCC, the primary source for 16 installation instructions is 17 <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://gcc.gnu.org/install/">the GCC install page</link>. 18 In particular, list of prerequisite software needed to build the library 19 <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://gcc.gnu.org/install/prerequisites.html"> 20 starts with those requirements.</link> The same pages also list 21 the tools you will need if you wish to modify the source. 22 </para> 23 24 <para> 25 Additional data is given here only where it applies to libstdc++. 26 </para> 27 28 <para>As of GCC 4.0.1 the minimum version of binutils required to build 29 libstdc++ is <code>2.15.90.0.1.1</code>. 30 Older releases of libstdc++ do not require such a recent version, 31 but to take full advantage of useful space-saving features and 32 bug-fixes you should use a recent binutils whenever possible. 33 The configure process will automatically detect and use these 34 features if the underlying support is present. 35 </para> 36 37 <para> 38 To generate the API documentation from the sources you will need 39 Doxygen, see <link linkend="appendix.porting.doc">Documentation 40 Hacking</link> in the appendix for full details. 41 </para> 42 43 <para> 44 Finally, a few system-specific requirements: 45 </para> 46 47 <variablelist> 48 <varlistentry> 49 <term>linux</term> 50 51 <listitem> 52 <para> 53 The 'gnu' locale model makes use of <function>iconv</function> 54 for character set conversions. The relevant functions are provided 55 by Glibc and so are always available, however they can also be 56 provided by the separate GNU libiconv library. If GNU libiconv is 57 found when GCC is built (e.g., because its headers are installed 58 in <filename class="directory">/usr/local/include</filename>) 59 then the <filename>libstdc++.so.6</filename> library will have a 60 run-time dependency on <filename>libiconv.so.2</filename>. 61 If you do not want that run-time dependency then you should do 62 one of the following: 63 </para> 64 <itemizedlist> 65 <listitem> 66 <para> 67 Uninstall the libiconv headers before building GCC. 68 Glibc already provides <function>iconv</function> so you should 69 not need libiconv anyway. 70 </para> 71 </listitem> 72 <listitem> 73 <para> 74 <link xmlns:xlink="http://www.w3.org/1999/xlink" 75 xlink:href="https://www.gnu.org/software/libiconv/#downloading"> 76 Download</link> the libiconv sources and extract them into the 77 top level of the GCC source tree, e.g., 78 </para> 79 <programlisting> 80 wget https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.16.tar.gz 81 tar xf libiconv-1.16.tar.gz 82 ln -s libiconv-1.16 libiconv 83 </programlisting> 84 <para> 85 This will build libiconv as part of building GCC and link to 86 it statically, so there is no <filename>libiconv.so.2</filename> 87 dependency. 88 </para> 89 </listitem> 90 <listitem> 91 <para> 92 Configure GCC with <option>--with-libiconv-type=static</option>. 93 This requires the static <filename>libiconv.a</filename> library, 94 which is not installed by default. You might need to reinstall 95 libiconv using the <option>--enable-static</option> configure 96 option to get the static library. 97 </para> 98 </listitem> 99 </itemizedlist> 100 </listitem> 101 102 <listitem> 103 <para> 104 If GCC 3.1.0 or later on is being used on GNU/Linux, an attempt 105 will be made to use "C" library functionality necessary for 106 C++ named locale support. For GCC 4.6.0 and later, this 107 means that glibc 2.3 or later is required. 108 </para> 109 110 <para> 111 If the 'gnu' locale model is being used, the following 112 locales are used and tested in the libstdc++ testsuites. 113 The first column is the name of the locale, the second is 114 the character set it is expected to use. 115 </para> 116 <programlisting> 117 de_DE ISO-8859-1 118 de_DE@euro ISO-8859-15 119 en_GB ISO-8859-1 120 en_HK ISO-8859-1 121 en_PH ISO-8859-1 122 en_US ISO-8859-1 123 en_US.ISO-8859-1 ISO-8859-1 124 en_US.ISO-8859-15 ISO-8859-15 125 en_US.UTF-8 UTF-8 126 es_ES ISO-8859-1 127 es_MX ISO-8859-1 128 fr_FR ISO-8859-1 129 fr_FR@euro ISO-8859-15 130 is_IS UTF-8 131 it_IT ISO-8859-1 132 ja_JP.eucjp EUC-JP 133 ru_RU.ISO-8859-5 ISO-8859-5 134 ru_RU.UTF-8 UTF-8 135 se_NO.UTF-8 UTF-8 136 ta_IN UTF-8 137 zh_TW BIG5 138 </programlisting> 139 140 <para>Failure to have installed the underlying "C" library 141 locale information for any of the above regions means that 142 the corresponding C++ named locale will not work: because of 143 this, the libstdc++ testsuite will skip named locale tests 144 which need missing information. If this isn't an issue, don't 145 worry about it. If a named locale is needed, the underlying 146 locale information must be installed. Note that rebuilding 147 libstdc++ after "C" locales are installed is not necessary. 148 </para> 149 150 <para> 151 To install support for locales, do only one of the following: 152 </para> 153 154 <itemizedlist> 155 <listitem> 156 <para>install all locales</para> 157 </listitem> 158 <listitem> 159 <para>install just the necessary locales</para> 160 <itemizedlist> 161 <listitem> 162 <para>with Debian GNU/Linux:</para> 163 <para> Add the above list, as shown, to the file 164 <code>/etc/locale.gen</code> </para> 165 <para> run <code>/usr/sbin/locale-gen</code> </para> 166 </listitem> 167 <listitem> 168 <para>on most Unix-like operating systems:</para> 169 <para><code> localedef -i de_DE -f ISO-8859-1 de_DE </code></para> 170 <para>(repeat for each entry in the above list) </para> 171 </listitem> 172 <listitem> 173 <para> 174 Instructions for other operating systems solicited. 175 </para> 176 </listitem> 177 </itemizedlist> 178 </listitem> 179 </itemizedlist> 180 </listitem> 181 </varlistentry> 182 </variablelist> 183 184 </section> 185
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