source: trunk/third/gmp/INSTALL.autoconf @ 18191

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1Basic Installation
2==================
3
4   These are generic installation instructions.
5
6   The `configure' shell script attempts to guess correct values for
7various system-dependent variables used during compilation.  It uses
8those values to create a `Makefile' in each directory of the package.
9It may also create one or more `.h' files containing system-dependent
10definitions.  Finally, it creates a shell script `config.status' that
11you can run in the future to recreate the current configuration, and a
12file `config.log' containing compiler output (useful mainly for
13debugging `configure').
14
15   It can also use an optional file (typically called `config.cache'
16and enabled with `--cache-file=config.cache' or simply `-C') that saves
17the results of its tests to speed up reconfiguring.  (Caching is
18disabled by default to prevent problems with accidental use of stale
19cache files.)
20
21   If you need to do unusual things to compile the package, please try
22to figure out how `configure' could check whether to do them, and mail
23diffs or instructions to the address given in the `README' so they can
24be considered for the next release.  If you are using the cache, and at
25some point `config.cache' contains results you don't want to keep, you
26may remove or edit it.
27
28   The file `configure.ac' (or `configure.in') is used to create
29`configure' by a program called `autoconf'.  You only need
30`configure.ac' if you want to change it or regenerate `configure' using
31a newer version of `autoconf'.
32
33The simplest way to compile this package is:
34
35  1. `cd' to the directory containing the package's source code and type
36     `./configure' to configure the package for your system.  If you're
37     using `csh' on an old version of System V, you might need to type
38     `sh ./configure' instead to prevent `csh' from trying to execute
39     `configure' itself.
40
41     Running `configure' takes awhile.  While running, it prints some
42     messages telling which features it is checking for.
43
44  2. Type `make' to compile the package.
45
46  3. Optionally, type `make check' to run any self-tests that come with
47     the package.
48
49  4. Type `make install' to install the programs and any data files and
50     documentation.
51
52  5. You can remove the program binaries and object files from the
53     source code directory by typing `make clean'.  To also remove the
54     files that `configure' created (so you can compile the package for
55     a different kind of computer), type `make distclean'.  There is
56     also a `make maintainer-clean' target, but that is intended mainly
57     for the package's developers.  If you use it, you may have to get
58     all sorts of other programs in order to regenerate files that came
59     with the distribution.
60
61Compilers and Options
62=====================
63
64   Some systems require unusual options for compilation or linking that
65the `configure' script does not know about.  Run `./configure --help'
66for details on some of the pertinent environment variables.
67
68   You can give `configure' initial values for variables by setting
69them in the environment.  You can do that on the command line like this:
70
71     ./configure CC=c89 CFLAGS=-O2 LIBS=-lposix
72
73   *Note Environment Variables::, for more details.
74
75Compiling For Multiple Architectures
76====================================
77
78   You can compile the package for more than one kind of computer at the
79same time, by placing the object files for each architecture in their
80own directory.  To do this, you must use a version of `make' that
81supports the `VPATH' variable, such as GNU `make'.  `cd' to the
82directory where you want the object files and executables to go and run
83the `configure' script.  `configure' automatically checks for the
84source code in the directory that `configure' is in and in `..'.
85
86   If you have to use a `make' that does not support the `VPATH'
87variable, you have to compile the package for one architecture at a time
88in the source code directory.  After you have installed the package for
89one architecture, use `make distclean' before reconfiguring for another
90architecture.
91
92Installation Names
93==================
94
95   By default, `make install' will install the package's files in
96`/usr/local/bin', `/usr/local/man', etc.  You can specify an
97installation prefix other than `/usr/local' by giving `configure' the
98option `--prefix=PATH'.
99
100   You can specify separate installation prefixes for
101architecture-specific files and architecture-independent files.  If you
102give `configure' the option `--exec-prefix=PATH', the package will use
103PATH as the prefix for installing programs and libraries.
104Documentation and other data files will still use the regular prefix.
105
106   In addition, if you use an unusual directory layout you can give
107options like `--bindir=PATH' to specify different values for particular
108kinds of files.  Run `configure --help' for a list of the directories
109you can set and what kinds of files go in them.
110
111   If the package supports it, you can cause programs to be installed
112with an extra prefix or suffix on their names by giving `configure' the
113option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
114
115Optional Features
116=================
117
118   Some packages pay attention to `--enable-FEATURE' options to
119`configure', where FEATURE indicates an optional part of the package.
120They may also pay attention to `--with-PACKAGE' options, where PACKAGE
121is something like `gnu-as' or `x' (for the X Window System).  The
122`README' should mention any `--enable-' and `--with-' options that the
123package recognizes.
124
125   For packages that use the X Window System, `configure' can usually
126find the X include and library files automatically, but if it doesn't,
127you can use the `configure' options `--x-includes=DIR' and
128`--x-libraries=DIR' to specify their locations.
129
130Specifying the System Type
131==========================
132
133   There may be some features `configure' cannot figure out
134automatically, but needs to determine by the type of host the package
135will run on.  Usually `configure' can figure that out, but if it prints
136a message saying it cannot guess the host type, give it the
137`--build=TYPE' option.  TYPE can either be a short name for the system
138type, such as `sun4', or a canonical name which has the form:
139
140     CPU-COMPANY-SYSTEM
141
142where SYSTEM can have one of these forms:
143
144     OS
145     KERNEL-OS
146
147   See the file `config.sub' for the possible values of each field.  If
148`config.sub' isn't included in this package, then this package doesn't
149need to know the host type.
150
151   If you are _building_ compiler tools for cross-compiling, you should
152use the `--target=TYPE' option to select the type of system they will
153produce code for.
154
155   If you want to _use_ a cross compiler, that generates code for a
156platform different from the build platform, you should specify the host
157platform (i.e., that on which the generated programs will eventually be
158run) with `--host=TYPE'.  In this case, you should also specify the
159build platform with `--build=TYPE', because, in this case, it may not
160be possible to guess the build platform (it sometimes involves
161compiling and running simple test programs, and this can't be done if
162the compiler is a cross compiler).
163
164Sharing Defaults
165================
166
167   If you want to set default values for `configure' scripts to share,
168you can create a site shell script called `config.site' that gives
169default values for variables like `CC', `cache_file', and `prefix'.
170`configure' looks for `PREFIX/share/config.site' if it exists, then
171`PREFIX/etc/config.site' if it exists.  Or, you can set the
172`CONFIG_SITE' environment variable to the location of the site script.
173A warning: not all `configure' scripts look for a site script.
174
175Environment Variables
176=====================
177
178   Variables not defined in a site shell script can be set in the
179environment passed to configure.  However, some packages may run
180configure again during the build, and the customized values of these
181variables may be lost.  In order to avoid this problem, you should set
182them in the `configure' command line, using `VAR=value'.  For example:
183
184     ./configure CC=/usr/local2/bin/gcc
185
186will cause the specified gcc to be used as the C compiler (unless it is
187overridden in the site shell script).
188
189`configure' Invocation
190======================
191
192   `configure' recognizes the following options to control how it
193operates.
194
195`--help'
196`-h'
197     Print a summary of the options to `configure', and exit.
198
199`--version'
200`-V'
201     Print the version of Autoconf used to generate the `configure'
202     script, and exit.
203
204`--cache-file=FILE'
205     Enable the cache: use and save the results of the tests in FILE,
206     traditionally `config.cache'.  FILE defaults to `/dev/null' to
207     disable caching.
208
209`--config-cache'
210`-C'
211     Alias for `--cache-file=config.cache'.
212
213`--quiet'
214`--silent'
215`-q'
216     Do not print messages saying which checks are being made.  To
217     suppress all normal output, redirect it to `/dev/null' (any error
218     messages will still be shown).
219
220`--srcdir=DIR'
221     Look for the package's source code in directory DIR.  Usually
222     `configure' can determine that directory automatically.
223
224`configure' also accepts some other, not widely useful, options.  Run
225`configure --help' for more details.
226
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