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123 lines
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123 lines
4.5 KiB
HTML
<html>
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<title>Configuring egcs-1.0 </title>
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<body bgcolor="white">
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<h1 align="center">Configuring egcs-1.0</h1>
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<p>Like most GNU software, egcs must be configured before it can be built.
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This document attempts to describe the recommended configuration procedure
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for both native and cross targets.
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<p>We use <i>srcdir</i> to refer to the toplevel source directory for
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egcs; we use <i>objdir</i> to refer to the toplevel build/object
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directory for egcs.
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<p>First, we <b>highly</b> recommend that egcs be built into a separate
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directory than the sources. This is how we generally build egcs; building
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where <i>srcdir</i> == <i>objdir</i> should still work, but doesn't get
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extensive testing.
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<p>Second, when configuring a native system, either "cc" must be in your
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path or you must set CC in your environment before running configure.
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Otherwise the configuration scripts may fail.
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<p>To configure egcs:
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<blockquote>
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<tt>
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<br>% mkdir <i>objdir</i>
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<br>% cd <i>objdir</i>
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<br>% <i>srcdir</i>/configure <b>[target]</b> <b>[options]</b>
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</tt>
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</blockquote>
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<p><b>target specification</b>
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<ul>
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<li> egcs has code to correctly determine the correct value for
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<b>target</b> for nearly all native systems. Therefore, we highly
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recommend you not provide a configure target when configuring a
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native compiler.
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<li> <b>target</b> must be specified when configuring a cross compiler;
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examples of valid targets would be i960-rtems, m68k-coff, sh-elf, etc.
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</ul>
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<p><b> options specification</b>
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<p>Use <b>options</b> to override several configure time options for
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egcs. A partial list of supported <tt>options</tt>:
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<ul>
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<li> <tt>--prefix=</tt><i>dirname</i> -- Specify the toplevel installation
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directory. This is the recommended way to install the tools into a directory
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other than the default. The toplevel installation directory defaults to
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/usr/local.
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<br>These additional options control where certain parts of the distribution
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are installed. Normally you should not need to use these options.
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<ul>
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<li> <tt>--with-local-prefix=</tt><i>dirname</i> -- Specify the installation
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directory for local include files. The default is /usr/local.
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<li> <tt>--with-gxx-include-dir=</tt><i>dirname</i> -- Specify the installation
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directory for g++ header files. The default is /usr/local/include/g++.
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</ul>
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<li> <tt>--enable-shared</tt> -- Build shared versions of the C++ runtime
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libraries if supported <tt>--disable-shared</tt> is the default.
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<li> <tt>--enable-haifa</tt> -- Enable the new Haifa instruction scheduler in the
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compiler; the new scheduler can significantly improve code on some targets.
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<tt>--disable-haifa</tt> is currently the default on all platforms except the HPPA.
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<li> <tt>--with-gnu-as</tt> -- Specify that the compiler should assume the GNU
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assembler (aka gas) is available.
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<li> <tt>--with-gnu-ld</tt> -- Specify that the compiler should assume the GNU
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linker (aka gld) is available.
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<li> <tt>--with-stabs</tt> -- Specify that stabs debugging information should be used
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instead of whatever format the host normally uses. Normally GCC uses the
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same debug format as the host system.
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<li> <tt>--enable-multilib</tt> -- Specify that multiple target libraries
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should be built to support different target variants, calling conventions,
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etc. This is the default.
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<li> <tt>--enable-threads</tt> -- Specify that the target supports threads.
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This only effects the Objective-C compiler and runtime library.
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<li> <tt>--enable-threads=</tt><i>lib</i> -- Specify that <i>lib</i> is the
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thread support library. This only effects the Objective-C compiler and
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runtime library.
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<li> <tt>--with-cpu=</tt><i>cpu</i> -- Specify which cpu variant the compiler should
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generate code for by default. This is currently only supported on the
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RS6000/PowerPC ports.
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</ul>
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<p>Some options which only apply to building cross compilers:
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<ul>
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<li> <tt>--with-headers=</tt><i>dir</i> -- Specifies a directory which has target
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include files.
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<li> <tt>--with-libs=</tt><i>dirs</i> -- Specifies a list of directories which contain
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the target runtime libraries.
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<li> <tt>--with-newlib</tt> -- Specifies that "newlib" is being used as the target
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C library. This causes __eprintf to be omitted from libgcc.a on the
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assumption that it will be provided by newlib.
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</ul>
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<p>Note that each <tt>--enable</tt> option has a corresponding <tt>--disable</tt> option and
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that each <tt>--with</tt> option has a corresponding <tt>--without</tt> option.
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<p>
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<hr>
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<i>Last modified on December 2, 1997.</i>
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</body>
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</html>
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