Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 

Back: The most useful Makefile targets
Forward: Introducing Makefiles
 
FastBack: Invoking configure
Up: Invoking configure
FastForward: Introducing Makefiles
Top: Autoconf, Automake, and Libtool
Contents: Table of Contents
Index: Index
About: About this document

3.4 Configuration Names

The GNU Autotools name all types of computer systems using a configuration name. This is a name for the system in a standardized format.

Some example configuration names are `sparc-sun-solaris2.7', `i586-pc-linux-gnu', or `i386-pc-cygwin'.

All configuration names used to have three parts, and in some documentation they are still called configuration triplets. A three part configuration name is cpu-manufacturer-operating_system. Currently configuration names are permitted to have four parts on systems which distinguish the kernel and the operating system, such as GNU/Linux. In these cases, the configuration name is cpu-manufacturer-kernel-operating_system.

When using a configuration name in an option to a tool such as configure, it is normally not necessary to specify an entire name. In particular, the middle field (manufacturer, described below) is often omitted, leading to strings such as `i386-linux' or `sparc-sunos'. The shell script `config.sub' is used to translate these shortened strings into the canonical form.

On most Unix variants, the shell script `config.guess' will print the correct configuration name for the system it is run on. It does this by running the standard `uname' program, and by examining other characteristics of the system. On some systems, `config.guess' requires a working C compiler or an assembler.

Because `config.guess' can normally determine the configuration name for a machine, it is only necessary for a user or developer to specify a configuration name in unusual cases, such as when building a cross-compiler.

Here is a description of each field in a configuration name:

cpu
The type of processor used on the system. This is typically something like `i386' or `sparc'. More specific variants are used as well, such as `mipsel' to indicate a little endian MIPS processor.

manufacturer
A somewhat freeform field which indicates the manufacturer of the system. This is often simply `unknown'. Other common strings are `pc' for an IBM PC compatible system, or the name of a workstation vendor, such as `sun'.

operating_system
The name of the operating system which is run on the system. This will be something like `solaris2.5' or `winnt4.0'. There is no particular restriction on the version number, and strings like `aix4.1.4.0' are seen.

Configuration names may be used to describe all sorts of systems, including embedded systems which do not run any operating system. In this case, the field is normally used to indicate the object file format, such as `elf' or `coff'.

kernel
This is used mainly for GNU/Linux systems. A typical GNU/Linux configuration name is `i586-pc-linux-gnulibc1'. In this case the kernel, `linux', is separated from the operating system, `gnulibc1'.

`configure' allows fine control over the format of binary files. It is not necessary to build a package for a given kind of machine on that machine natively--instead, a cross-compiler can be used. Moreover, if the package you are trying to build is itself capable of operating in a cross configuration, then the build system need not be the same kind of machine used to host the cross-configured package once the package is built! Consider some examples:

Compiling a simple package for a GNU/Linux system.
host = build = target = `i586-pc-linux-gnu'

Cross-compiling a package on a GNU/Linux system that is intended to
run on an IBM AIX machine: build = `i586-pc-linux-gnu', host = target = `rs6000-ibm-aix3.2'

Building a Solaris-hosted MIPS-ECOFF cross-compiler on a GNU/Linux
system. build = `i586-pc-linux-gnu', host = `sparc-sun-solaris2.4', target = `mips-idt-ecoff'


This document was generated by Gary V. Vaughan on February, 8 2006 using texi2html

 
 
  Published under the terms of the Open Publication License Design by Interspire