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<html>
<head>
<title>Configuring egcs-1.0.1 </title>
</head>
<body bgcolor="white">
<h1 align="center">Configuring egcs-1.0.1</h1>
<p>Like most GNU software, egcs must be configured before it can be built.
This document attempts to describe the recommended configuration procedure
for both native and cross targets.
<p>We use <i>srcdir</i> to refer to the toplevel source directory for
egcs; we use <i>objdir</i> to refer to the toplevel build/object
directory for egcs.
<p>First, we <b>highly</b> recommend that egcs be built into a separate
directory than the sources. This is how we generally build egcs; building
where <i>srcdir</i> == <i>objdir</i> should still work, but doesn't get
extensive testing.
<p>Second, when configuring a native system, either "cc" must be in your
path or you must set CC in your environment before running configure.
Otherwise the configuration scripts may fail.
<p>To configure egcs:
<blockquote>
<tt>
<br>% mkdir <i>objdir</i>
<br>% cd <i>objdir</i>
<br>% <i>srcdir</i>/configure <b>[target]</b> <b>[options]</b>
</tt>
</blockquote>
<p><b>target specification</b>
<ul>
<li> egcs has code to correctly determine the correct value for
<b>target</b> for nearly all native systems. Therefore, we highly
recommend you not provide a configure target when configuring a
native compiler.
<li> <b>target</b> must be specified when configuring a cross compiler;
examples of valid targets would be i960-rtems, m68k-coff, sh-elf, etc.
</ul>
<p><b> options specification</b>
<p>Use <b>options</b> to override several configure time options for
egcs. A partial list of supported <tt>options</tt>:
<ul>
<li> <tt>--prefix=</tt><i>dirname</i> -- Specify the toplevel installation
directory. This is the recommended way to install the tools into a directory
other than the default. The toplevel installation directory defaults to
/usr/local.
<br>These additional options control where certain parts of the distribution
are installed. Normally you should not need to use these options.
<ul>
<li> <tt>--with-local-prefix=</tt><i>dirname</i> -- Specify the installation
directory for local include files. The default is /usr/local.
<li> <tt>--with-gxx-include-dir=</tt><i>dirname</i> -- Specify the installation
directory for g++ header files. The default is /usr/local/include/g++.
</ul>
<li> <tt>--enable-shared</tt> -- Build shared versions of the C++ runtime
libraries if supported <tt>--disable-shared</tt> is the default.
<li> <tt>--enable-haifa</tt> -- Enable the new Haifa instruction scheduler in the
compiler; the new scheduler can significantly improve code on some targets.
<tt>--disable-haifa</tt> is currently the default on all platforms except the HPPA.
<li> <tt>--with-gnu-as</tt> -- Specify that the compiler should assume the GNU
assembler (aka gas) is available.
<li> <tt>--with-gnu-ld</tt> -- Specify that the compiler should assume the GNU
linker (aka gld) is available.
<li> <tt>--with-stabs</tt> -- Specify that stabs debugging information should be used
instead of whatever format the host normally uses. Normally GCC uses the
same debug format as the host system.
<li> <tt>--enable-multilib</tt> -- Specify that multiple target libraries
should be built to support different target variants, calling conventions,
etc. This is the default.
<li> <tt>--enable-threads</tt> -- Specify that the target supports threads.
This only effects the Objective-C compiler and runtime library.
<li> <tt>--enable-threads=</tt><i>lib</i> -- Specify that <i>lib</i> is the
thread support library. This only effects the Objective-C compiler and
runtime library.
<li> <tt>--with-cpu=</tt><i>cpu</i> -- Specify which cpu variant the compiler should
generate code for by default. This is currently only supported on the
RS6000/PowerPC ports.
</ul>
<p>Some options which only apply to building cross compilers:
<ul>
<li> <tt>--with-headers=</tt><i>dir</i> -- Specifies a directory which has target
include files.
<li> <tt>--with-libs=</tt><i>dirs</i> -- Specifies a list of directories which contain
the target runtime libraries.
<li> <tt>--with-newlib</tt> -- Specifies that "newlib" is being used as the target
C library. This causes __eprintf to be omitted from libgcc.a on the
assumption that it will be provided by newlib.
</ul>
<p>Note that each <tt>--enable</tt> option has a corresponding <tt>--disable</tt> option and
that each <tt>--with</tt> option has a corresponding <tt>--without</tt> option.
<p>
<hr>
<i>Last modified on Jan 2, 1998.</i>
</body>
</html>
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