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GDB comes with a configure
script that automates the process
of preparing GDB for installation; you can then use make
to
build the gdb
program.
The GDB distribution includes all the source code you need for GDB in a single directory, whose name is usually composed by appending the version number to `gdb'.
For example, the GDB version 6.3 for GNAT Academic Edition, Version 2005 (20050615) distribution is in the `gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)' directory. That directory contains:
gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/configure (and supporting files)
gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/gdb
gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/bfd
gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/include
gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/libiberty
gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/opcodes
gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/readline
gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/glob
gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/mmalloc
The simplest way to configure and build GDB is to run configure
from the `gdb-version-number' source directory, which in
this example is the `gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)' directory.
First switch to the `gdb-version-number' source directory
if you are not already in it; then run configure
. Pass the
identifier for the platform on which GDB will run as an
argument.
For example:
cd gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615) ./configure host make |
where host is an identifier such as `sun4' or
`decstation', that identifies the platform where GDB will run.
(You can often leave off host; configure
tries to guess the
correct value by examining your system.)
Running `configure host' and then running make
builds the
`bfd', `readline', `mmalloc', and `libiberty'
libraries, then gdb
itself. The configured source files, and the
binaries, are left in the corresponding source directories.
configure
is a Bourne-shell (/bin/sh
) script; if your
system does not recognize this automatically when you run a different
shell, you may need to run sh
on it explicitly:
sh configure host |
If you run configure
from a directory that contains source
directories for multiple libraries or programs, such as the
`gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)' source directory for version 6.3 for GNAT Academic Edition, Version 2005 (20050615), configure
creates configuration files for every directory level underneath (unless
you tell it not to, with the `--norecursion' option).
You should run the configure
script from the top directory in the
source tree, the `gdb-version-number' directory. If you run
configure
from one of the subdirectories, you will configure only
that subdirectory. That is usually not what you want. In particular,
if you run the first configure
from the `gdb' subdirectory
of the `gdb-version-number' directory, you will omit the
configuration of `bfd', `readline', and other sibling
directories of the `gdb' subdirectory. This leads to build errors
about missing include files such as `bfd/bfd.h'.
You can install gdb
anywhere; it has no hardwired paths.
However, you should make sure that the shell on your path (named by
the `SHELL' environment variable) is publicly readable. Remember
that GDB uses the shell to start your program--some systems refuse to
let GDB debug child processes whose programs are not readable.
B.1 Compiling GDB in another directory B.2 Specifying names for hosts and targets B.3 configure
optionsSummary of options for configure
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If you want to run GDB versions for several host or target machines,
you need a different gdb
compiled for each combination of
host and target. configure
is designed to make this easy by
allowing you to generate each configuration in a separate subdirectory,
rather than in the source directory. If your make
program
handles the `VPATH' feature (GNU make
does), running
make
in each of these directories builds the gdb
program specified there.
To build gdb
in a separate directory, run configure
with the `--srcdir' option to specify where to find the source.
(You also need to specify a path to find configure
itself from your working directory. If the path to configure
would be the same as the argument to `--srcdir', you can leave out
the `--srcdir' option; it is assumed.)
For example, with version 6.3 for GNAT Academic Edition, Version 2005 (20050615), you can build GDB in a separate directory for a Sun 4 like this:
cd gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615) mkdir ../gdb-sun4 cd ../gdb-sun4 ../gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/configure sun4 make |
When configure
builds a configuration using a remote source
directory, it creates a tree for the binaries with the same structure
(and using the same names) as the tree under the source directory. In
the example, you'd find the Sun 4 library `libiberty.a' in the
directory `gdb-sun4/libiberty', and GDB itself in
`gdb-sun4/gdb'.
Make sure that your path to the `configure' script has just one instance of `gdb' in it. If your path to `configure' looks like `../gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)/gdb/configure', you are configuring only one subdirectory of GDB, not the whole package. This leads to build errors about missing include files such as `bfd/bfd.h'.
One popular reason to build several GDB configurations in separate
directories is to configure GDB for cross-compiling (where
GDB runs on one machine--the host---while debugging
programs that run on another machine--the target).
You specify a cross-debugging target by
giving the `--target=target' option to configure
.
When you run make
to build a program or library, you must run
it in a configured directory--whatever directory you were in when you
called configure
(or one of its subdirectories).
The Makefile
that configure
generates in each source
directory also runs recursively. If you type make
in a source
directory such as `gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)' (or in a separate configured
directory configured with `--srcdir=dirname/gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)'), you
will build all the required libraries, and then build GDB.
When you have multiple hosts or targets configured in separate
directories, you can run make
on them in parallel (for example,
if they are NFS-mounted on each of the hosts); they will not interfere
with each other.
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The specifications used for hosts and targets in the configure
script are based on a three-part naming scheme, but some short predefined
aliases are also supported. The full naming scheme encodes three pieces
of information in the following pattern:
architecture-vendor-os |
For example, you can use the alias sun4
as a host argument,
or as the value for target in a --target=target
option. The equivalent full name is `sparc-sun-sunos4'.
The configure
script accompanying GDB does not provide
any query facility to list all supported host and target names or
aliases. configure
calls the Bourne shell script
config.sub
to map abbreviations to full names; you can read the
script, if you wish, or you can use it to test your guesses on
abbreviations--for example:
% sh config.sub i386-linux i386-pc-linux-gnu % sh config.sub alpha-linux alpha-unknown-linux-gnu % sh config.sub hp9k700 hppa1.1-hp-hpux % sh config.sub sun4 sparc-sun-sunos4.1.1 % sh config.sub sun3 m68k-sun-sunos4.1.1 % sh config.sub i986v Invalid configuration `i986v': machine `i986v' not recognized |
config.sub
is also distributed in the GDB source
directory (`gdb-6.3 for GNAT Academic Edition, Version 2005 (20050615)', for version 6.3 for GNAT Academic Edition, Version 2005 (20050615)).
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configure
options
Here is a summary of the configure
options and arguments that
are most often useful for building GDB. configure
also has
several other options not listed here. See Info file `configure.info', node `What Configure Does', for a full explanation of configure
.
configure [--help] [--prefix=dir] [--exec-prefix=dir] [--srcdir=dirname] [--norecursion] [--rm] [--target=target] host |
You may introduce options with a single `-' rather than `--' if you prefer; but you may abbreviate option names if you use `--'.
--help
configure
.
--prefix=dir
--exec-prefix=dir
--srcdir=dirname
make
, or another
make
that implements the VPATH
feature.configure
writes configuration specific files in
the current directory, but arranges for them to use the source in the
directory dirname. configure
creates directories under
the working directory in parallel to the source directories below
dirname.
--norecursion
configure
is executed; do not
propagate configuration to subdirectories.
--target=target
There is no convenient way to generate a list of all available targets.
host ...
There is no convenient way to generate a list of all available hosts.
There are many other options available as well, but they are generally needed for special purposes only.
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