mirror of git://gcc.gnu.org/git/gcc.git
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412 lines
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
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<HTML>
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<HEAD>
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<META NAME="AUTHOR" CONTENT="pme@sources.redhat.com (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=StyleSheet HREF="lib3styles.css">
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<!-- $Id: install.html,v 1.12 2000/12/03 23:47:47 jsm28 Exp $ -->
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</HEAD>
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<BODY>
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<H1 CLASS="centered"><A NAME="top">libstdc++-v3 INSTALL</A></H1>
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<P>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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</P>
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<P>To the <A HREF="http://gcc.gnu.org/libstdc++/">libstdc++-v3 homepage</A>.
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<!-- ####################################################### -->
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<HR>
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<H2>Contents</H2>
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<UL>
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<LI><A HREF="#prereqs">Tools you will need beforehand</A>
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<LI><A HREF="#srcsetup">Setting up the source directories</A>
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<LI><A HREF="#config">Configuring</A>
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<LI><A HREF="#install">Building and installing the library</A>
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<LI><A HREF="#postinstall">Post-installation</A>
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<LI><A HREF="#usage">Using the library</A>
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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>You will need a recent version of g++ to compile the snapshot of
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libstdc++: gcc-2.95.2 works well, or one of the post-2.95.2 GCC
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snapshots (insert standard caveat about using snapshots rather
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than formal releases). You will need the full source
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distribution to whatever compiler release you are using. The
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GCC snapshots can be had from one of the sites on their
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<A HREF="http://gcc.gnu.org/mirrors.html">mirror list</A>.
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</P>
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<P>In addition, if you plan to modify the makefiles or regenerate
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the configure scripts you'll need the nuevo automake, libtool
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and autoconf to regenerate the Makefiles and configure
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scripts. These tools are all required to be installed in the
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same location (most linux distributions install these tools by
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default, so no worries.)
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</P>
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<P>If you don't have bash, and want to run <TT>'make check'</TT> to
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test your build, you'll need to get bash 2.x. Also recommended
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is GNU Make, since it is the only 'make' that will parse these
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makefiles correctly.
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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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<TT>-ffunction-sections -fdata-sections -Wl,--gc-sections</TT>.
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To obtain maximum benefit from this, binutils after this date
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should also be used (bugs were fixed with C++ exception handling
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related to this change in libstdc++-v3). The version of these
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tools should be <TT>2.10.90</TT>, 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>.
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</P>
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<P>Finally, a few system-specific requirements:
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<DL>
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<DT>Cygwin
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<DD>If you are using Cygwin to compile libstdc++-v3 on Win32, you'll
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have to get a version of the cygwin1.dll that is dated on or
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after February 1, 2000. This is necessary to successfully run
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the script "mknumeric_limits" which probes the
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floating-point
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environment of the host in question -- before this date, Cygwin
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would freeze when running this script. In addition, you may
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want to get a current version of libtool (say libtool-1.3.4
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and above) as earlier versions supposedly had problems creating
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shared libraries.
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<DT>Solaris
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<DD>We recommend installing the <TT>SUNWxcu4</TT> package from the
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Solaris CD before configuring the library. You can check for
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this package as a non-privileged user with the command
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"pkginfo SUNWxcu4".
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</DL>
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</P>
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<HR>
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<H2><A NAME="srcsetup">Setting up the source directories</A></H2>
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<P><EM>As the libstdc++-v3 sources and the core GCC sources have
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converged, more and more effort goes to building the
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library as the default version to be shipped with g++. With the
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2.90.8 snapshot, and especially for CVS versions after this
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release, this is treated as the usual scenario. If you want to
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build the library all by itself, you will need to explicitly
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disable certain features (like namespaces) since the core GCC
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library, libgcc.a, will not be rebuilt with those same features.
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</EM>
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</P>
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<P>By default, all configurations of libstdc++-v3 now have namespaces
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enabled. Being able to select/de-select this option was a complex task
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that had hopelessly confused many otherwise intelligent people, and
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provided an endless stream of silent cursing and cries for help.
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Because of this, gcc sources are required, and are no longer optional.
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</P>
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<P>The following definitions will be used throughout the rest of this
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document:
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<UL>
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<LI><EM>gccsrcdir</EM>: The directory holding the source of the
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compiler. It should have several subdirectories like
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<EM>gccsrcdir</EM>/libio and <EM>gccsrcdir</EM>/gcc.
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<LI><EM>libsrcdir</EM>: The directory holding the source of the
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C++ library.
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<LI><EM>gccbuilddir</EM>: The build directory for the compiler
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in <EM>gccsrcdir</EM>. GCC requires that it be built in
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a different directory than its sources.
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<LI><EM>libbuilddir</EM>: The build directory for libstdc++.
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<LI><EM>destdir</EM>: The eventual installation directory for
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the compiler/libraries, set with the --prefix option to
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the configure script.
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</UL>
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Note:
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<OL>
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<LI>The .8 snapshot and following are intended to replace the
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library that comes with the compiler, so <EM>libsrcdir</EM>
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and <EM>libbuilddir</EM> must be contained under
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<EM>gccsrcdir</EM> and <EM>gccbuilddir</EM>, respectively.
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<LI>The source, build, and installation directories should
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not be parents of one another; i.e., these should all be
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separate directories. Please don't build out of the
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source directory.
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</OL>
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</P>
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<P>Since the release of libstdc++-2.90.8, configuration patches have gone
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into CVS gcc that make the management of the various libstdc++ source
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trees a bit easier. Because of this, both libstdc++-v2 and
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libstdc++-v3 and live together more or less in peace, without the need
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for soft linking. If a CVS gcc source directory after April 5, 2000 is
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being used, then the directions are slightly different: please pick
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which of the following two scenarios best represents your particular
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situation.
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</P>
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<P><B>...with gcc-2.95.2</B>
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<P>Unpack the <EM>gccsrcdir</EM> and go into that directory. For
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instance, <TT>gcc-2.95.2</TT> is a valid <EM>gccsrcdir</EM>.
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Once in <EM>gccsrcdir</EM>, you'll need to rename the directories
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called <TT> libstdc++ </TT> and <TT> libio </TT> like so:
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<PRE>
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mv libstdc++ libstdc++-v2
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mv libio libio-v2</PRE>
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</P>
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<P>Next, unpack the libstdc++-v3 library tarball into the
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<EM>gccsrcdir</EM> directory; it will create a
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<EM>libsrcdir</EM> called <TT>libstdc++-<EM>version</EM></TT>:
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<PRE>
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gzip -dc libstdc++-version.tar.gz | tar xf -</PRE>
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</P>
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<P>Finally, make a soft link between <EM>libsrcdir</EM> and
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<TT>libstdc++</TT> so that libstdc++-v3 will be the default C++
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library used.
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<PRE>
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ln -s <EM>libsrcdir</EM> libstdc++</PRE>
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This complexity of having two completely separate libstdc++
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libraries is necessary so that you can unlink <EM>libsrcdir</EM>
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and update the compiler sources. If you're not this adventurous, or
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would not like to switch between different C++ standard libraries,
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this extra effort is probably wasted; just remove the v2 sources.
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</P>
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</P>
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<P><B>...with CVS gcc</B>
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<P>Check out or download the gcc sources: the resulting source
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directory is <EM>gccsrcdir</EM>.
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</P>
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<P>Next, unpack the libstdc++-v3 library tarball into this
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<EM>gccsrcdir</EM> directory; it will create a
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<EM>libsrcdir</EM> called <TT>libstdc++-<EM>version</EM></TT>:
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<PRE>
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gzip -dc libstdc++-version.tar.gz | tar xf -</PRE>
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</P>
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<P>If CVS libstdc++-v3 is being used instead of a snapshot's tarball,
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then move the source directory from the CVS checkout into the
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<EM>gccsrcdir</EM> directory.
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<P>Finally, rename <EM>libsrcdir</EM> to <TT>libstdc++-v3</TT> so that
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gcc's configure flags will be able to deal with the new library.
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<PRE>
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mv <EM>libsrcdir</EM> libstdc++-v3</PRE>
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</P>
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</P>
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<HR>
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<H2><A NAME="config">Configuring</A></H2>
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<P>Due to namespaces, 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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<P><B>...with gcc-2.95.2</B>
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<PRE>
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<EM>gccsrcdir</EM>/configure --prefix=<EM>destdir</EM></PRE>
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</P>
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<P><B>...with CVS gcc</B>
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<PRE>
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<EM>gccsrcdir</EM>/configure --prefix=<EM>destdir</EM> --enable-libstdcxx-v3</PRE>
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</P>
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<P>Adding <TT>--enable-libstdcxx-v3</TT> automatically selects libstdc++-v3
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as the C++ library to be used alongside the C++ compiler being built,
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and also enables -fhonor-std by default. This option is not available
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with gcc-2.95.2.
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</P>
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<HR>
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<H2><A NAME="install">Building and installing the library</A></H2>
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<P>Now you have a few options:</P>
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<H3>[re]building <EM>everything</EM></H3>
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<P>If you're building GCC from scratch, you can do the usual
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<TT> 'make bootstrap' </TT> here, and libstdc++-v3 will be built
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as its default C++ library. The generated g++ will magically
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use the correct headers, link against the correct library
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binary, and in general using libstdc++-v3 will be a piece of
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cake. You're done; run <TT>'make install'</TT> (the GCC
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Installation instructions) to put the new compiler and libraries
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into place.
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</P>
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<H3>[re]building only libstdc++</H3>
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<P>Due to differences in the configure process, the resulting Makefiles
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in the<EM>gccbuilddir</EM> will have different rules depending on
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the source base being used.
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</P>
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<P><B>...with gcc-2.95.2</B>
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<BLOCKQUOTE>
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<EM>libstdc++-rule</EM> is <TT>libstdc++</TT>
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</BLOCKQUOTE>
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</P>
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<P><B>...with CVS gcc</B>
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<BLOCKQUOTE>
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<EM>libstdc++-rule</EM> is <TT>libstdc++-v3</TT>
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</BLOCKQUOTE>
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</P>
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<P>To rebuild just libstdc++, use:
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<PRE>
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make all-target-<EM>libstdc++-rule</EM></PRE>
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This will configure and build the C++ library in the
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<EM>gccbuilddir/cpu-vendor-OS/</EM>libstdc++ directory.
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As en example, for CVS gcc this would be
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<TT>make all-target-libstdc++-v3</TT>, and for gcc-2.95.2 it would be
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<TT>make all-target-libstdc++</TT>
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</P>
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<P>If the build fails with a "warning: can't inline call"
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message when compiling stringMAIN.cc, see <A HREF="#Werror">the
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resolution at the end of this document</A>.
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</P>
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<P>If you are rebuilding from a previous build [attempt], some
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information is kept in a cache file. This is stored in
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<EM>gccbuilddir/cpu-vendor-OS/</EM> if you are building with
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multilibs (the default), or in
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<EM>gccbuilddir/cpu-vendor-OS/</EM>libstdc++-v3 if you have
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multilibs disabled. The filename is config.cache; if previous
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information is causing problems, you can delete it entirely, or
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simply edit it and remove lines.
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</P>
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<P>You're done. Now install the rebuilt pieces with
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<PRE>
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make install</PRE>
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or
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<PRE>
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make install-gcc
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make install-target-<EM>libstdc++-rule</EM></PRE>
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</P>
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<HR>
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<H2><A NAME="postinstall">Post-installation</A></H2>
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<P>Installation will create the <EM>destdir</EM> directory and
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populate it with subdirectories:
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<PRE>
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lib/
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include/g++-v3/
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bits/
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backward/
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ext/</PRE>
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</P>
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<P>You can check the status of the build without installing it using
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<PRE>
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make check</PRE>
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or you can check the status of the installed library using
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<PRE>
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make check-target-<EM>libstdc++-rule</EM></PRE>
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These commands will create a 'testsuite' directory underneath
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<EM>libbuilddir</EM> containing the results of the tests. We are
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interested in any strange failures of the testsuite; please see
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<A HREF="faq/index.html#2_4">FAQ 2.4</A> for which files to examine.
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</P>
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<HR>
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<H2><A NAME="usage">Using the library</A></H2>
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<LI><B>Find the new library at runtime (shared linking only)</B>
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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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<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>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):<TT> -Wl,--rpath -Wl,<EM>destdir</EM>/lib</TT>
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<LI>IRIX ld:<TT> -Wl,-rpath -Wl,<EM>destdir</EM>/lib</TT>
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<LI>Solaris ld:<TT> -Wl,-R<EM>destdir</EM>/lib</TT>
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<LI>More...?
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</UL>
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</UL>
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</P>
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<P>Use the <TT>ldd(1)</TT> 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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</OL>
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</P>
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<HR>
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<H3><A NAME="Werror"><TT>warning: can't inline call to</TT>...</A></H3>
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<P>When building the .8 snapshot with g++ 2.95.2, compilation may halt
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with this warning message. The "problem" is the -Werror
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flag being passed to the compiler, which says to treat warnings as
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errors. (This plus a high warning level makes us track down bugs
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<EM>quickly</EM>.) The compiler can't inline a certain call, prints
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a warning, and dies.
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</P>
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<P>The workaround is to edit either <EM>libsrcdir</EM>/src/Makefile.in
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(before configuring) or <EM>bld-libstdc++</EM>/src/Makefile
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(after configuring). There's one line that reads
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<PRE>
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WERROR = -Werror</PRE>
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Delete the flag itself, so that the line reads
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<PRE>
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WERROR =</PRE>
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Then the compiler will still print a warning, but it won't die.
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</P>
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<P>For the curious, this "problem" is actually a symptom
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of something else. The compiler in CVS could inline more than what
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2.95.2 does, and the libstdc++ changes were made with that
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compiler. One of the libstdc++ maintainers explains this
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<A HREF="http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00420.html">here</A>.
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</P>
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<P>This has been patched in current CVS sources.
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</P>
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<!--
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<HR>
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<H2><A NAME=""></A></H2>
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<P>
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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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Comments and suggestions are welcome, and may be sent to
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<A HREF="mailto:pme@sources.redhat.com">Phil Edwards</A> or
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<A HREF="mailto:gdr@gcc.gnu.org">Gabriel Dos Reis</A>.
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<BR> $Id: install.html,v 1.12 2000/12/03 23:47:47 jsm28 Exp $
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</EM></P>
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</BODY>
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</HTML>
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