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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta name="AUTHOR" content="pme@gcc.gnu.org (Phil Edwards)" />
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<meta name="KEYWORDS" content="libstdc++, libstdc++-v3, GCC, g++" />
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<meta name="DESCRIPTION" content="README for the GNU libstdc++ effort." />
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<meta name="GENERATOR" content="vi and eight fingers" />
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<title>libstdc++-v3 Installation Instructions</title>
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<link rel="Copyright" href="17_intro/license.html" type="text/html" />
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</head>
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<body>
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<h1 class="centered"><a name="top">Getting started: configure, build, install</a></h1>
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<p class="fineprint"><em>
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The latest version of this document is always available at
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<a href="http://gcc.gnu.org/onlinedocs/libstdc++/install.html">
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http://gcc.gnu.org/onlinedocs/libstdc++/install.html</a>.
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</em></p>
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<p><em>
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To the <a href="http://gcc.gnu.org/libstdc++/">libstdc++-v3 homepage</a>.
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</em></p>
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<!-- ####################################################### -->
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<hr />
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<h2>Contents</h2>
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<p>Because libstdc++-v3 is part of GCC, the primary source for
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installation instructions is
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<a href="http://gcc.gnu.org/install/">the GCC install page</a>.
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Additional data is given here only where it applies to libstdc++-v3.
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</p>
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<ul>
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<li><a href="#prereqs">Tools you will need beforehand</a></li>
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<li><a href="#config">Configuring</a></li>
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<li><a href="#usage">Using the library</a></li>
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</ul>
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<hr />
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<!-- ####################################################### -->
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<h2><a name="prereqs">Tools you will need beforehand</a></h2>
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<p>The list of software needed to build the library is kept with the
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rest of the compiler, at
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<a href="http://gcc.gnu.org/install/prerequisites.html">
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http://gcc.gnu.org/install/prerequisites.html</a>. The same page
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also lists the tools you will need if you wish to modify the source.
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</p>
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<p>As of June 19, 2000, libstdc++ attempts to use tricky and
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space-saving features of the GNU toolchain, enabled with
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<code>-ffunction-sections -fdata-sections -Wl,--gc-sections</code>.
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To obtain maximum benefit from this, binutils after this date should
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also be used (bugs were fixed with C++ exception handling related
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to this change in libstdc++-v3). The version of these tools should
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be <code>2.10.90</code>, or later, and you can get snapshots (as
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well as releases) of binutils
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<a href="ftp://sources.redhat.com/pub/binutils">here</a>. The
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configure process will automatically detect and use these features
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if the underlying support is present.
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</p>
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<p>Finally, a few system-specific requirements: </p>
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<dl>
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<dt> linux </dt>
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<dd>If gcc 3.1.0 or later on is being used on linux, an attempt
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will be made to use "C" library functionality necessary for C++
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named locale support. For gcc 3.2.1 and later, this means that
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glibc 2.2.5 or later is required and the "C" library de_DE locale
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information must be installed.
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<p>
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The configure option --enable-clocale can be used force a
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particular behavior.
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</p>
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<p>
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If the 'gnu' locale model is being used, the following locales
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are used and tested in the libstdc++ testsuites. The first column
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is the name of the locale, the second is the character set it is
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expected to use.
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</p>
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<pre>
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de_DE ISO-8859-1
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de_DE@euro ISO-8859-15
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en_HK ISO-8859-1
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en_PH ISO-8859-1
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en_US ISO-8859-1
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en_US.ISO-8859-1 ISO-8859-1
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en_US.ISO-8859-15 ISO-8859-15
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en_US.UTF-8 UTF-8
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es_ES ISO-8859-1
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es_MX ISO-8859-1
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fr_FR ISO-8859-1
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fr_FR@euro ISO-8859-15
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is_IS UTF-8
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it_IT ISO-8859-1
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ja_JP.eucjp EUC-JP
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se_NO.UTF-8 UTF-8
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ta_IN UTF-8
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zh_TW BIG5
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</pre>
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<p>Failure to have the underlying "C" library locale
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information installed will mean that C++ named locales for the
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above regions will not work: because of this, the libstdc++
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testsuite will skip the named locale tests. If this isn't an
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issue, don't worry about it. If named locales are needed, the
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underlying locale information must be installed. Note that
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rebuilding libstdc++ after the "C" locales are installed is not
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necessary.
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</p>
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<p>To install support for locales, do only one of the following:
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</p>
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<ul>
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<li> install all locales
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<ul>
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<li>with RedHat Linux:
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<p> <code> export LC_ALL=C </code> </p>
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<p> <code> rpm -e glibc-common --nodeps </code> </p>
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<p> <code> rpm -i --define "_install_langs all"
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glibc-common-2.2.5-34.i386.rpm </code> </p>
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</li>
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<li> (instructions for other operating systems solicited) </li>
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</ul>
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</li>
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<li> install just the necessary locales
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<ul>
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<li>with Debian Linux:
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<p> Add the above list, as shown, to the file
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<code>/etc/locale.gen</code> </p>
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<p> run <code>/usr/sbin/locale-gen</code> </p>
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</li>
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<li> on most Unix-like operating systems:
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<p> <code> localedef -i de_DE -f ISO-8859-1 de_DE </code> </p>
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<p> (repeat for each entry in the above list) </p>
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</li>
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<li> (instructions for other operating systems solicited) </li>
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</ul>
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</li>
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</ul>
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</dd>
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</dl>
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<hr />
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<h2><a name="config">Configuring</a></h2>
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<p>If you have never done this before, you should read the basic
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<a href="http://gcc.gnu.org/install/">GCC Installation
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Instructions</a> first. Read <em>all of them</em>.
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<strong>Twice.</strong>
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</p>
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<p>When building libstdc++-v3 you'll have to configure
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the entire <em>gccsrcdir</em> directory. The full list of libstdc++-v3
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specific configuration options, not dependent on the specific compiler
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release being used, can be found <a href="configopts.html">here</a>.
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</p>
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<p>Consider possibly using --enable-languages=c++ to save time by only
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building the C++ language parts.
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</p>
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<pre>
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cd <em>gccbuilddir</em>
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<em>gccsrcdir</em>/configure --prefix=<em>destdir</em> --other-opts...</pre>
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<hr />
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<h2><a name="usage">Using the library</a></h2>
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<h3>Find the new library at runtime (shared linking only)</h3>
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<p>If you only built a static library (libstdc++.a), or if you
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specified static linking, you don't have to worry about this.
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But if you built a shared library (libstdc++.so) and linked
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against it, then you will need to find that library when you
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run the executable.
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</p>
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<p>Methods vary for different platforms and different styles, but
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the usual ones are printed to the screen during installation.
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They include:
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</p>
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<ul>
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<li>At runtime set LD_LIBRARY_PATH in your environment correctly,
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so that the shared library for libstdc++ can be found and
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loaded. Be certain that you understand all of the other
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implications and behavior of LD_LIBRARY_PATH first (few
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people do, and they get into trouble).
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</li>
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<li>Compile the path to find the library at runtime into the
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program. This can be done by passing certain options to g++,
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which will in turn pass them on to the linker. The exact
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format of the options is dependent on which linker you use:
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<ul>
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<li>GNU ld (default on Linux):<code> -Wl,--rpath,<em>destdir</em>/lib</code></li>
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<li>IRIX ld:<code> -Wl,-rpath,<em>destdir</em>/lib</code></li>
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<li>Solaris ld:<code> -Wl,-R<em>destdir</em>/lib</code></li>
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<li>More...? Let us know!</li>
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</ul>
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</li>
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</ul>
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<p>Use the <code>ldd(1)</code> utility to show which library the system
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thinks it will get at runtime.
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</p>
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<p>A libstdc++.la file is also installed, for use with Libtool. If
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you use Libtool to create your executables, these details are
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taken care of for you.
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</p>
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<!--
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<h2><a name=""></a></h2>
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</p>
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-->
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<!-- ####################################################### -->
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<hr />
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<p class="fineprint"><em>
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See <a href="17_intro/license.html">license.html</a> for copying conditions.
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Comments and suggestions are welcome, and may be sent to
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<a href="mailto:libstdc++@gcc.gnu.org">the libstdc++ mailing list</a>.
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</em></p>
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