1 Installation Instructions
2 *************************
4 Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
5 2006, 2007 Free Software Foundation, Inc.
7 This file is free documentation; the Free Software Foundation gives
8 unlimited permission to copy, distribute and modify it.
10 Glog-Specific Install Notes
11 ================================
13 *** NOTE FOR 64-BIT LINUX SYSTEMS
15 The glibc built-in stack-unwinder on 64-bit systems has some problems
16 with the glog libraries. (In particular, if you are using
17 InstallFailureSignalHandler(), the signal may be raised in the middle
18 of malloc, holding some malloc-related locks when they invoke the
19 stack unwinder. The built-in stack unwinder may call malloc
20 recursively, which may require the thread to acquire a lock it already
23 For that reason, if you use a 64-bit system and you need
24 InstallFailureSignalHandler(), we strongly recommend you install
25 libunwind before trying to configure or install google glog.
26 libunwind can be found at
28 http://download.savannah.nongnu.org/releases/libunwind/libunwind-snap-070410.tar.gz
30 Even if you already have libunwind installed, you will probably still
31 need to install from the snapshot to get the latest version.
33 CAUTION: if you install libunwind from the URL above, be aware that
34 you may have trouble if you try to statically link your binary with
35 glog: that is, if you link with 'gcc -static -lgcc_eh ...'. This
36 is because both libunwind and libgcc implement the same C++ exception
37 handling APIs, but they implement them differently on some platforms.
38 This is not likely to be a problem on ia64, but may be on x86-64.
40 Also, if you link binaries statically, make sure that you add
41 -Wl,--eh-frame-hdr to your linker options. This is required so that
42 libunwind can find the information generated by the compiler required
45 Using -static is rare, though, so unless you know this will affect you
48 If you cannot or do not wish to install libunwind, you can still try
49 to use two kinds of stack-unwinder: 1. glibc built-in stack-unwinder
50 and 2. frame pointer based stack-unwinder.
52 1. As we already mentioned, glibc's unwinder has a deadlock issue.
53 However, if you don't use InstallFailureSignalHandler() or you don't
54 worry about the rare possibilities of deadlocks, you can use this
55 stack-unwinder. If you specify no options and libunwind isn't
56 detected on your system, the configure script chooses this unwinder by
59 2. The frame pointer based stack unwinder requires that your
60 application, the glog library, and system libraries like libc, all be
61 compiled with a frame pointer. This is *not* the default for x86-64.
63 If you are on x86-64 system, know that you have a set of system
64 libraries with frame-pointers enabled, and compile all your
65 applications with -fno-omit-frame-pointer, then you can enable the
66 frame pointer based stack unwinder by passing the
67 --enable-frame-pointers flag to configure.
73 Briefly, the shell commands `./configure; make; make install' should
74 configure, build, and install this package. The following
75 more-detailed instructions are generic; see the `README' file for
76 instructions specific to this package.
78 The `configure' shell script attempts to guess correct values for
79 various system-dependent variables used during compilation. It uses
80 those values to create a `Makefile' in each directory of the package.
81 It may also create one or more `.h' files containing system-dependent
82 definitions. Finally, it creates a shell script `config.status' that
83 you can run in the future to recreate the current configuration, and a
84 file `config.log' containing compiler output (useful mainly for
85 debugging `configure').
87 It can also use an optional file (typically called `config.cache'
88 and enabled with `--cache-file=config.cache' or simply `-C') that saves
89 the results of its tests to speed up reconfiguring. Caching is
90 disabled by default to prevent problems with accidental use of stale
93 If you need to do unusual things to compile the package, please try
94 to figure out how `configure' could check whether to do them, and mail
95 diffs or instructions to the address given in the `README' so they can
96 be considered for the next release. If you are using the cache, and at
97 some point `config.cache' contains results you don't want to keep, you
98 may remove or edit it.
100 The file `configure.ac' (or `configure.in') is used to create
101 `configure' by a program called `autoconf'. You need `configure.ac' if
102 you want to change it or regenerate `configure' using a newer version
105 The simplest way to compile this package is:
107 1. `cd' to the directory containing the package's source code and type
108 `./configure' to configure the package for your system.
110 Running `configure' might take a while. While running, it prints
111 some messages telling which features it is checking for.
113 2. Type `make' to compile the package.
115 3. Optionally, type `make check' to run any self-tests that come with
118 4. Type `make install' to install the programs and any data files and
121 5. You can remove the program binaries and object files from the
122 source code directory by typing `make clean'. To also remove the
123 files that `configure' created (so you can compile the package for
124 a different kind of computer), type `make distclean'. There is
125 also a `make maintainer-clean' target, but that is intended mainly
126 for the package's developers. If you use it, you may have to get
127 all sorts of other programs in order to regenerate files that came
128 with the distribution.
130 6. Often, you can also type `make uninstall' to remove the installed
133 Compilers and Options
134 =====================
136 Some systems require unusual options for compilation or linking that the
137 `configure' script does not know about. Run `./configure --help' for
138 details on some of the pertinent environment variables.
140 You can give `configure' initial values for configuration parameters
141 by setting variables in the command line or in the environment. Here
144 ./configure CC=c99 CFLAGS=-g LIBS=-lposix
146 *Note Defining Variables::, for more details.
148 Compiling For Multiple Architectures
149 ====================================
151 You can compile the package for more than one kind of computer at the
152 same time, by placing the object files for each architecture in their
153 own directory. To do this, you can use GNU `make'. `cd' to the
154 directory where you want the object files and executables to go and run
155 the `configure' script. `configure' automatically checks for the
156 source code in the directory that `configure' is in and in `..'.
158 With a non-GNU `make', it is safer to compile the package for one
159 architecture at a time in the source code directory. After you have
160 installed the package for one architecture, use `make distclean' before
161 reconfiguring for another architecture.
166 By default, `make install' installs the package's commands under
167 `/usr/local/bin', include files under `/usr/local/include', etc. You
168 can specify an installation prefix other than `/usr/local' by giving
169 `configure' the option `--prefix=PREFIX'.
171 You can specify separate installation prefixes for
172 architecture-specific files and architecture-independent files. If you
173 pass the option `--exec-prefix=PREFIX' to `configure', the package uses
174 PREFIX as the prefix for installing programs and libraries.
175 Documentation and other data files still use the regular prefix.
177 In addition, if you use an unusual directory layout you can give
178 options like `--bindir=DIR' to specify different values for particular
179 kinds of files. Run `configure --help' for a list of the directories
180 you can set and what kinds of files go in them.
182 If the package supports it, you can cause programs to be installed
183 with an extra prefix or suffix on their names by giving `configure' the
184 option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
189 Some packages pay attention to `--enable-FEATURE' options to
190 `configure', where FEATURE indicates an optional part of the package.
191 They may also pay attention to `--with-PACKAGE' options, where PACKAGE
192 is something like `gnu-as' or `x' (for the X Window System). The
193 `README' should mention any `--enable-' and `--with-' options that the
196 For packages that use the X Window System, `configure' can usually
197 find the X include and library files automatically, but if it doesn't,
198 you can use the `configure' options `--x-includes=DIR' and
199 `--x-libraries=DIR' to specify their locations.
201 Specifying the System Type
202 ==========================
204 There may be some features `configure' cannot figure out automatically,
205 but needs to determine by the type of machine the package will run on.
206 Usually, assuming the package is built to be run on the _same_
207 architectures, `configure' can figure that out, but if it prints a
208 message saying it cannot guess the machine type, give it the
209 `--build=TYPE' option. TYPE can either be a short name for the system
210 type, such as `sun4', or a canonical name which has the form:
214 where SYSTEM can have one of these forms:
218 See the file `config.sub' for the possible values of each field. If
219 `config.sub' isn't included in this package, then this package doesn't
220 need to know the machine type.
222 If you are _building_ compiler tools for cross-compiling, you should
223 use the option `--target=TYPE' to select the type of system they will
226 If you want to _use_ a cross compiler, that generates code for a
227 platform different from the build platform, you should specify the
228 "host" platform (i.e., that on which the generated programs will
229 eventually be run) with `--host=TYPE'.
234 If you want to set default values for `configure' scripts to share, you
235 can create a site shell script called `config.site' that gives default
236 values for variables like `CC', `cache_file', and `prefix'.
237 `configure' looks for `PREFIX/share/config.site' if it exists, then
238 `PREFIX/etc/config.site' if it exists. Or, you can set the
239 `CONFIG_SITE' environment variable to the location of the site script.
240 A warning: not all `configure' scripts look for a site script.
245 Variables not defined in a site shell script can be set in the
246 environment passed to `configure'. However, some packages may run
247 configure again during the build, and the customized values of these
248 variables may be lost. In order to avoid this problem, you should set
249 them in the `configure' command line, using `VAR=value'. For example:
251 ./configure CC=/usr/local2/bin/gcc
253 causes the specified `gcc' to be used as the C compiler (unless it is
254 overridden in the site shell script).
256 Unfortunately, this technique does not work for `CONFIG_SHELL' due to
257 an Autoconf bug. Until the bug is fixed you can use this workaround:
259 CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash
261 `configure' Invocation
262 ======================
264 `configure' recognizes the following options to control how it operates.
268 Print a summary of the options to `configure', and exit.
272 Print the version of Autoconf used to generate the `configure'
276 Enable the cache: use and save the results of the tests in FILE,
277 traditionally `config.cache'. FILE defaults to `/dev/null' to
282 Alias for `--cache-file=config.cache'.
287 Do not print messages saying which checks are being made. To
288 suppress all normal output, redirect it to `/dev/null' (any error
289 messages will still be shown).
292 Look for the package's source code in directory DIR. Usually
293 `configure' can determine that directory automatically.
295 `configure' also accepts some other, not widely useful, options. Run
296 `configure --help' for more details.