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Update for 4.3.

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John Gilmore
1991-12-07 15:52:36 +00:00
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gdb/README
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@ -1,5 +1,5 @@
README for gdb-4.0 release
John Gilmore 23 Aug 91
README for gdb-4.3 release
John Gilmore 7 Dec 1991
This is GDB, the GNU source-level debugger, presently running under un*x.
A summary of features new since gdb-3.5 is in the file `WHATS.NEW'.
@ -8,23 +8,26 @@ A summary of features new since gdb-3.5 is in the file `WHATS.NEW'.
Unpacking and Installation -- quick overview
==========================
This release moves the generic GNU include files, the BFD ("binary file
description") library, the getopt routines, obstacks, and the readline
library into the parent directory of the gdb source files. The idea is
that a variety of GNU tools can share a common copy of these things.
In this release, the GDB debugger sources, the generic GNU include
files, the BFD ("binary file description") library, the readline library,
and a miscellaneous library all have directories of their own underneath
the gdb-4.3 directory. The idea is that a variety of GNU tools can
share a common copy of these things. Configuration scripts and
makefiles exist to cruise up and down this directory tree and
automatically build all the pieces in the right order.
These generic files are packaged together with the directory containing
the source code for GDB, for now. When you unpack the gdb-4.0.tar.Z
file, you'll get a directory called `gdb-4.0', which contains:
When you unpack the gdb-4.3.tar.Z file, you'll get a directory called
`gdb-4.3', which contains:
Makefile.in bfd/ configure.in libiberty/
README config.sub* gdb/ readline/
README.configure configure* include/ texinfo/
Makefile.in config/ gdb/ texinfo/
README config.sub* include/
README.configure configure* libiberty/
bfd/ configure.in readline/
To build GDB, you can just do:
cd gdb-4.0
./configure HOSTNAME
cd gdb-4.3
./configure HOSTTYPE (e.g. sun4, decstation)
make
cp gdb/gdb /usr/local/bin/gdb (or wherever you want)
@ -39,61 +42,62 @@ while debugging a program running on a machine of another type. See below.
More Documentation
==================
The GDB 4.0 release includes an already-formatted reference card, ready
for printing on a PostScript printer, as `gdb-4.0/gdb/refcard.ps'. It
uses the most common PostScript fonts: the Times family, Courier,
and Symbol. If you have a PostScript printer you can print the
reference card by just sending `refcard.ps' to the printer.
The GDB 4.3 release includes an already-formatted reference card,
ready for printing on a PostScript printer, as
`gdb-4.3/gdb/refcard.ps'. It uses the most common PostScript fonts:
the Times family, Courier, and Symbol. If you have a PostScript
printer, you can print the reference card by just sending `refcard.ps'
to the printer.
The release also includes the online Info version of the manual
already formatted: the main Info file is `gdb-4.0/gdb/gdb.info', and
it refers to subordinate files matching `gdb.info*' in the same
directory.
The release also includes the online Info version of this manual
already formatted: the main Info file is `gdb-4.3/gdb/gdb.info', and it
refers to subordinate files matching `gdb.info*' in the same directory.
If you want to make these Info files yourself from the GDB
manual's source, you need the GNU `makeinfo' program. Once you have
it, you can type
If you want to make these Info files yourself from the GDB manual's
source, you need the GNU `makeinfo' program. Once you have it, you
can type
cd gdb-4.0/gdb
cd gdb-4.3/gdb
make gdb.info
to make the Info file.
If you want to format and print copies of this manual, you need
If you want to format and print copies of the manual, you need
several things:
* TeX, the public domain typesetting program written by Donald
Knuth, must be installed on your system and available through
your execution path.
* `gdb-4.0/texinfo': TeX macros defining the GNU Documentation
* `gdb-4.3/texinfo': TeX macros defining the GNU Documentation
Format.
* *A DVI output program.* TeX doesn't actually make marks on
paper; it produces output files called DVI files. If your
system has TeX installed, chances are it has a program for
printing out these files; one popular example is `dvips', which
can print DVI files on PostScript printers.
* *A DVI output program.* TeX does not actually make marks on
paper; it produces output files called DVI files. If your system
has TeX installed, chances are it has a program for printing out
these files; one popular example is `dvips', which can print DVI
files on PostScript printers.
Once you have these things, you can type
cd gdb-4.0/gdb
cd gdb-4.3/gdb
make gdb.dvi
to format the text of this manual, and print it with the usual output
method for TeX DVI files at your site.
If you want to print the reference card, but don't have a PostScript
printer, or want to print using Computer Modern fonts instead, you can
still print it if you have TeX. Format the reference card by typing
If you want to print the reference card, but do not have a
PostScript printer, or you want to use Computer Modern fonts instead,
you can still print it if you have TeX. Format the reference card by
typing
cd gdb-4.0/gdb
cd gdb-4.3/gdb
make refcard.dvi
The GDB reference card is designed to print in landscape mode on US
"letter" size paper; that is, on a sheet 11 inches wide by 8.5
inches high. You will need to specify this form of printing as an
option to your DVI output program.
"letter" size paper; that is, on a sheet 11 inches wide by 8.5 inches
high. You will need to specify this form of printing as an option to
your DVI output program.
Installing GDB
@ -104,192 +108,189 @@ 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 `gdb-4.0'. That directory in turn contains:
in a single directory `gdb-4.3'. That directory in turn contains:
`gdb-4.0/configure'
Overall script for configuring GDB and all its supporting
libraries.
`gdb-4.3/configure (and supporting files)'
script for configuring GDB and all its supporting libraries.
`gdb-4.0/gdb'
`gdb-4.3/gdb'
the source specific to GDB itself
`gdb-4.0/bfd'
`gdb-4.3/bfd'
source for the Binary File Descriptor Library
`gdb-4.0/include'
`gdb-4.3/include'
GNU include files
`gdb-4.0/libiberty'
`gdb-4.3/libiberty'
source for the `-liberty' free software library
`gdb-4.0/readline'
`gdb-4.3/readline'
source for the GNU command-line interface
Each of these directories has its own `configure' script, which are
used by the overall `configure' script in `gdb-4.0'.
It is most convenient to run `configure' from the `gdb-4.3' directory.
The simplest way to configure and build GDB is the following:
It is most convenient to run `configure' from the `gdb-4.0'
directory. The simplest way to configure and build GDB is the
following:
cd gdb-4.0
cd gdb-4.3
./configure HOST
make
where HOST is something like `sun4' or `decstation', that identifies
the platform where GDB will run. This builds the three libraries
`bfd', `readline', and `libiberty', then `gdb' itself. The
configured source files, and the binaries, are left in the
corresponding source directories.
`bfd', `readline', and `libiberty', then `gdb' itself. The configured
source files, and the binaries, are left in the corresponding source
directories.
You can install `gdb' anywhere; it has no hardwired paths.
However, you should make sure that the shell on your path (named by
`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'.
You can *run* the `configure' script from any of the subordinate
directories in the GDB distribution (if you only want to configure
that subdirectory); but be sure to specify a path to it. For example,
to configure only the `bfd' subdirectory,
cd gdb-4.3/bfd
../configure HOST
You can install `gdb' anywhere; it has no hardwired paths. Simply
copy `gdb/gdb' to the desired directory.
However, you should make sure that the shell on your path (named by
the `SHELL' environment variable) is publicly readable; some systems
refuse to let GDB debug child processes whose programs are not
readable, and GDB uses the shell to start your program.
Configuration Subdirectories
============================
If you want to run GDB versions for several host or target
machines, you'll 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. If your `make' program handles the `VPATH' feature
(GNU `make' does), running `make' in each of these directories then
builds the gdb program specified there.
If you want to run GDB versions for several host or target machines,
you'll 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. If your
`make' program handles the `VPATH' feature (GNU `make' does), running
`make' in each of these directories then builds the gdb program
specified there.
`configure' creates these subdirectories for you when you
simultaneously specify several configurations; but it's a good habit
simultaneously specify several configurations; but it is a good habit
even for a single configuration. You can specify the use of
subdirectories using the `+subdirs' option (abbreviated `+sub').
For example, you can build GDB on a Sun 4 as follows:
subdirectories using the `+subdirs' option (abbreviated `+sub'). For
example, you can build GDB this way on a Sun 4 as follows:
cd gdb-4.0
cd gdb-4.3
./configure +sub sun4
cd Host-sparc-sun-sunos4/Target-sparc-sun-sunos4
cd H-sun4/T-sun4
make
When `configure' uses subdirectories to build programs or
libraries, it creates nested directories `Host-HOST/Target-TARGET'.
(As you see in the example, the names used for HOST and TARGET may
be expanded from your `configure' argument; *note Config Names::.).
libraries, it creates nested directories `H-HOST/T-TARGET'.
`configure' uses these two directory levels because GDB can be
configured for cross-compiling: GDB can run on one machine (the
host) while debugging programs that run on another machine (the
target). You specify cross-debugging targets by giving the
`+target=TARGET' option to `configure'. Specifying only hosts still
gives you two levels of subdirectory for each host, with the same
configuration suffix on both; that is, if you give any number of
hosts but no targets, GDB will be configured for native debugging on
each host. On the other hand, whenever you specify both hosts and
targets on the same command line, `configure' creates all
combinations of the hosts and targets you list.
configured for cross-compiling: GDB can run on one machine (the host)
while debugging programs that run on another machine (the target).
You specify cross-debugging targets by giving the `+target=TARGET'
option to `configure'. Specifying only hosts still gives you two
levels of subdirectory for each host, with the same configuration
suffix on both; that is, if you give any number of hosts but no
targets, GDB will be configured for native debugging on each host. On
the other hand, whenever you specify both hosts and targets on the
same command line, `configure' creates all combinations of the hosts
and targets you list.
When you run `make' to build a program or library, you must run it
in a configured directory. If you made a single configuration,
without subdirectories, run `make' in the source directory. If you
have `Host-HOST/Target-TARGET' subdirectories, run `make' in those
subdirectories.
Each `configure' and `Makefile' under each source directory runs
recursively, so that typing `make' in `gdb-4.0' (or in a
`gdb-4.0/Host-HOST/Target-TARGET' subdirectory) builds all the
required libraries, then GDB.
If you run `configure' from a directory (such as `gdb-4.0') that
If you run `configure' from a directory (notably, `gdb-4.3') that
contains source directories for multiple libraries or programs,
`configure' creates the `Host-HOST/Target-TARGET' subdirectories in
each library or program's source directory. For example, typing:
`configure' creates the `H-HOST/T-TARGET' subdirectories in each
library or program's source directory. For example, typing:
cd gdb-4.0
cd gdb-4.3
configure sun4 +target=vxworks960
creates the following directories:
gdb-4.0/Host-sparc-sun-sunos4/Target-i960-wrs-vxworks
gdb-4.0/bfd/Host-sparc-sun-sunos4/Target-i960-wrs-vxworks
gdb-4.0/gdb/Host-sparc-sun-sunos4/Target-i960-wrs-vxworks
gdb-4.0/libiberty/Host-sparc-sun-sunos4/Target-i960-wrs-vxworks
gdb-4.0/readline/Host-sparc-sun-sunos4/Target-i960-wrs-vxworks
gdb-4.3/H-sun4/T-vxworks960
gdb-4.3/bfd/H-sun4/T-vxworks960
gdb-4.3/gdb/H-sun4/T-vxworks960
gdb-4.3/libiberty/H-sun4/T-vxworks960
gdb-4.3/readline/H-sun4/T-vxworks960
The `Makefile' in
When you run `make' to build a program or library, you must run it
in a configured directory. If you made a single configuration,
without subdirectories, run `make' in the source directory. If you
have `H-HOST/T-TARGET' subdirectories, run `make' in those
subdirectories.
gdb-4.0/Host-sparc-sun-sunos4/Target-i960-wrs-vxworks
will `cd' to the appropriate lower-level directories, for example:
gdb-4.0/bfd/Host-sparc-sun-sunos4/Target-i960-wrs-vxworks
building each in turn.
The `Makefile' generated by `configure' for each source directory
runs recursively, so that typing `make' in `gdb-4.3' (or in a
`gdb-4.3/H-HOST/T-TARGET' subdirectory) builds all the required
libraries, then GDB.
When you have multiple hosts or targets configured, 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.
You can also use the `+objdir=ALTROOT' option to have the
configured files placed in a parallel directory structure rather than
alongside the source files; *note configure Options::..
Specifying Names for Hosts and Targets
======================================
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:
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 in
a `+target='TARGET option, but the full name of that configuration
specifies that the architecture is `sparc', the vendor is `sun', and
the operating system is `sunos4'.
a `+target=TARGET' option, but the equivalent full name is
`sparc-sun-sunos4'.
The following table shows all the architectures, hosts, and OS
prefixes that `configure' recognizes in GDB 4.0. Entries in the "OS
prefix"
column ending in a `*' may be followed by a release number.
prefixes that `configure' recognizes in GDB 4.3. Entries in the "OS
prefix" column ending in a `*' may be followed by a release number.
ARCHITECTURE VENDOR OS prefix
------------+-------------+-------------
| |
a29k | altos | aix*
alliant | aout | aout
arm | apollo | bout
c1 | att | bsd*
c2 | bout | coff
i386 | coff | ctix*
i860 | convergent | dynix*
i960 | convex | esix*
m68000 | dec | hpux*
m68k | encore | isc*
m88k | gould | mach*
mips | hp | newsos*
ns32k | ibm | nindy*
pyramid | intel | none
rs6000 | isi | osf*
rtpc | little | sco*
sparc | mips | sunos*
tahoe | motorola | sysv*
tron | ncr | ultrix*
vax | next | unos*
| none | v88r*
| sco | vms*
| sequent | vxworks*
| sgi |
| sony |
| sun |
| unicom |
| utek |
| wrs |
ARCHITECTURE VENDOR OS prefix
------------+--------------------------+---------------------------
| |
580 | altos hp | aix* msdos*
a29k | amd ibm | amigados newsos*
alliant | amdahl intel | aout nindy*
arm | aout isi | bout osf*
c1 | apollo little | bsd* sco*
c2 | att mips | coff sunos*
cray2 | bcs motorola | ctix* svr4
h8300 | bout ncr | dgux* sym*
i386 | bull next | dynix* sysv*
i860 | cbm nyu | ebmon ultrix*
i960 | coff sco | esix* unicos*
m68000 | convergent sequent | hds unos*
m68k | convex sgi | hpux* uts
m88k | cray sony | irix* v88r*
mips | dec sun | isc* vms*
ns32k | encore unicom | kern vxworks*
pyramid | gould utek | mach*
romp | hitachi wrs |
rs6000 | |
sparc | |
tahoe | |
tron | |
vax | |
xmp | |
ymp | |
*Warning:* Many combinations of architecture, vendor, and OS are
untested.
*Warning:* `configure' can represent a very large number of
combinations of architecture, vendor, and OS. There is by no
means support available for all possible combinations!
The `configure' script accompanying GDB 4.0 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:
The `configure' script accompanying GDB 4.3 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 sun4
sparc-sun-sunos4
@ -302,15 +303,19 @@ example:
% sh config.sub i386v
i386-none-sysv
% sh config.sub i486v
*** No vendor: configuration `i486v' not recognized
*** Configuration "i486v" not recognized
`config.sub' is also distributed in the directory `gdb-4.3'.
`configure' Options
===================
Here is a summary of all the `configure' options and arguments
that you might use for building GDB:
Here is a summary of all the `configure' options and arguments that
you might use for building GDB:
configure [+destdir=DIR] [+subdirs] [+norecur] [+rm]
configure [+destdir=DIR] [+subdirs]
[+objdir=ALTROOT] [+norecursion] [+rm]
[+target=TARGET...] HOST...
You may introduce options with the character `-' rather than `+' if
@ -326,19 +331,27 @@ you prefer; but you may abbreviate option names if you use `+'.
`+subdirs'
Write configuration specific files in subdirectories of the form
Host-HOST/Target-TARGET
H-HOST/T-TARGET
(and configure the `Makefile' to write binaries there too).
Without this option, if you specify only one configuration for
GDB, `configure' will use the same directory for source,
configured files, and binaries. This option is used
automatically if you specify more than one HOST or more than
one
`+target=TARGET' option on the `configure' command line.
(and configure the `Makefile' to generate object code in
subdirectories of this form as well). Without this option, if you
specify only one configuration for GDB, `configure' will use the
same directory for source, configured files, and binaries. This
option is used automatically if you specify more than one HOST or
more than one `+target=TARGET' option on the `configure' command
line.
`+norecur'
Configure only the directory where `configure' is executed; do
not propagate configuration to subdirectories.
`+norecursion'
Configure only the directory where `configure' is executed; do not
propagate configuration to subdirectories.
`+objdir=ALTROOT'
ALTROOT is an alternative directory used as the root for
configured files. `configure' will create directories under
ALTROOT in parallel to the source directories. If you use
`+objdir=ALTROOT' with `+subdirs', `configure' also builds the
`H-HOST/T-TARGET' subdirectories in the directory tree rooted in
ALTROOT.
`+rm'
Remove the configuration that the other arguments specify.
@ -366,14 +379,13 @@ affect GDB or its supporting libraries.
Languages other than C
C++ support has been integrated into gdb. GDB should work with FORTRAN
programs. (If you have problems, please send a bug report; you may
have to refer to some FORTRAN variables with a trailing underscore).
Andrew Beers has produced a GDB that works with Modula-2, which will
appear in gdb-4.1. I am not aware of anyone who is working on getting
gdb to use the syntax of any other language. Pascal programs which use
sets, subranges, file variables, or nested functions will not currently
work.
C++ support has been integrated into gdb. Partial Modula-2 support is
now in GDB. GDB should work with FORTRAN programs. (If you have
problems, please send a bug report; you may have to refer to some
FORTRAN variables with a trailing underscore). I am not aware of
anyone who is working on getting gdb to use the syntax of any other
language. Pascal programs which use sets, subranges, file variables,
or nested functions will not currently work.
Kernel debugging
@ -395,30 +407,32 @@ The file rem-multi.shar contains a general stub that can probably
run on various different flavors of unix to allow debugging over a
serial line from one machine to another.
The files remote-eb.c and remote-nindy.c are two examples of remote
interfaces for talking to existing ROM monitors (for the AMD 29000 and the
Intel 960 repsectively).
Some working remote interfaces for talking to existing ROM monitors
are:
remote-eb.c AMD 29000 "EBMON"
remote-nindy.c Intel 960 "Nindy"
remote-adapt.c AMD 29000 "Adapt"
remote-mm.c AMD 29000 "minimon"
Remote-vx.c and the vx-share subdirectory contain a remote interface for the
VxWorks realtime kernel, which communicates over TCP using the Sun
RPC library. This would be a useful starting point for other remote-
via-ethernet back ends.
[This section seems to be out of date, I have never seen the "rapp"
program, though I would like to. FIXME.]
`rapp' runs under unix and acts as a remote stub (like rem-multi.shar
distributed with GDB version 3). Currently it just works over UDP
(network), not over a serial line. To get it running
* Compile GDB on the host machine as usual
* Compile rapp on the target machine, giving for both host and target
the type of the target machine
* Install "gdb" in /etc/services on both machines.
Reporting Bugs
The correct address for reporting bugs found in gdb is
"bug-gdb@prep.ai.mit.edu". Please email all bugs to that address.
Please include the GDB version number (e.g. gdb-4.3), and how
you configured it (e.g. "sun4" or "mach386 host, i586-intel-synopsys
target").
A known bug:
* If you run with a watchpoint enabled, breakpoints will become
erratic and might not stop the program. Disabling or deleting the
watchpoint will fix the problem.
GDB can produce warnings about symbols that it does not understand. By
default, these warnings are disabled. You can enable them by executing
@ -426,14 +440,17 @@ default, these warnings are disabled. You can enable them by executing
I recommend doing this if you are working on a compiler, assembler,
linker, or gdb, since it will point out problems that you may be able
to fix. Warnings produced during symbol reading indicate some mismatch
between the object file and GDB's symbol reading code (in many cases,
between the object file and GDB's symbol reading code. In many cases,
it's a mismatch between the specs for the object file format, and what
the compiler actually outputs or the debugger actually understands).
the compiler actually outputs or the debugger actually understands.
If you port gdb to a new machine, please send the required changes
to bug-gdb@prep.ai.mit.edu. If your changes are more than a few
lines, obtain and send in a copyright assignment from gnu@prep.ai.mit.edu, as
described in the section `Writing Code for GDB'.
If you port gdb to a new machine, please send the required changes to
bug-gdb@prep.ai.mit.edu. There's lots of information about doing your
own port in the file gdb-4.3/gdb/doc/gdbint.texinfo, which you can
print out, or read with `info' (see the Makefile.in there). If your
changes are more than a few lines, obtain and send in a copyright
assignment from gnu@prep.ai.mit.edu, as described in the section
`Writing Code for GDB'.
X Windows versus GDB
@ -448,64 +465,6 @@ an editor while debugging I suggest trying gdb-mode in gnu-emacs
(Try typing M-x gdb RETURN). Comments on this mode are welcome.
About the machine-dependent files
tconfig/<machine>
This contains Makefile stuff for when the target system is <machine>.
It also specifies the name of the tm-XXX.h file for this machine.
xconfig/<machine>
This contains Makefile stuff for when the host system is <machine>.
It also specifies the name of the xm-XXX.h file for this machine.
tm-XXX.h (tm.h is a link to this file, created by configure).
This file contains macro definitions about the target machine's
registers, stack frame format and instructions.
xm-XXX.h (xm.h is a link to this file, created by configure).
This contains macro definitions describing the host system environment,
such as byte order, host C compiler and library, ptrace support,
and core file structure.
<machine>-opcode.h
<machine>-pinsn.c
These files contain the information necessary to print instructions
for your cpu type. <machine>-opcode.h includes some large initialized
data structures, which is strange for a ".h" file, but it's OK since
it is only included in one place. <machine>-opcode.h is shared
between the debugger and the assembler (if the GNU assembler has been
ported to that machine), whereas <machine>-pinsn.c is specific to GDB.
<machine>-tdep.c
This file contains any miscellaneous code required for this machine
as a target. On some machines it doesn't exist at all. Its existence
is specified in the tconfig/XXX file.
<machine>-xdep.c
This file contains any miscellaneous code required for this machine
as a host. On some machines it doesn't exist at all. Its existence
is specified in the xconfig/XXX file.
infptrace.c
This is the low level interface to inferior processes for systems
using the Unix ptrace call in a vanilla way. Some systems have their
own routines in <machine>-xdep.c. Whether or not it is used
is specified in the xconfig/XXX file.
coredep.c
Machine and system-dependent aspects of reading core files. Some
machines use coredep.c; some have the routines in <machine>-xdep.c.
Whether or not it is used is specified in the xconfig/XXX file.
Now that BFD is used to read core files, virtually all machines should
use coredep.c and should just provide fetch_core_registers in
<machine>-xdep.c.
exec.c
Machine and system-dependent aspects of reading executable files.
Some machines use exec.c; some have the routines in <machine>-tdep.c
Since BFD, virtually all machines should use exec.c.
Writing Code for GDB
We appreciate having users contribute code that is of general use, but
@ -515,9 +474,6 @@ future maintainance difficult. It is not much harder to do things
right, and in the long term it is worth it to the GNU project, and
probably to you individually as well.
Please code according to the GNU coding standards. If you do not have
a copy, you can request one by sending mail to gnu@prep.ai.mit.edu.
If you make substantial changes, you'll have to file a copyright
assignment with the Free Software Foundation before we can produce a
release that includes your changes. Send mail requesting the copyright
@ -525,6 +481,9 @@ assignment to gnu@prep.ai.mit.edu. Do this early, like before the
changes actually work, or even before you start them, because a manager
or lawyer on your end will probably make this a slow process.
Please code according to the GNU coding standards. If you do not have
a copy, you can request one by sending mail to gnu@prep.ai.mit.edu.
Please try to avoid making machine-specific changes to
machine-independent files. If this is unavoidable, put a hook in the
machine-independent file which calls a (possibly) machine-dependent
@ -550,6 +509,21 @@ different definitions for COFF and a.out, rather than trying to put
the necessary changes throughout all the code in dbxread.c that
currently assumes BSD format.
When generalizing GDB along a particular interface, please use an
attribute-struct rather than inserting tests or switch statements
everywhere. For example, GDB has been generalized to handle multiple
kinds of remote interfaces -- not by #ifdef's everywhere, but by
defining the "target_ops" structure and having a current target (as
well as a stack of targets below it, for memory references). Whenever
something needs to be done that depends on which remote interface we
are using, a flag in the current target_ops structure is tested (e.g.
`target_has_stack'), or a function is called through a pointer in the
current target_ops structure. In this way, when a new remote interface
is added, only one module needs to be touched -- the one that actually
implements the new remote interface. Other examples of
attribute-structs are BFD access to multiple kinds of object file
formats, or GDB's access to multiple source languages.
Please avoid duplicating code. For example, in GDB 3.x all the stuff
in infptrace.c was duplicated in *-dep.c, and so changing something
was very painful. In GDB 4.x, these have all been consolidated
@ -568,10 +542,11 @@ Ultrix 4.0, a program can't be running in one process while it is being
debugged in another. Rather than doing "./gdb ./gdb", which works on
Suns and such, you can copy gdb to gdb2 and then do "./gdb ./gdb2".
When you run gdb in this directory, it will read a ".gdbinit" file that
sets up some simple things to make debugging gdb easier. The "info"
command, when executed without a subcommand in a gdb being debugged by
gdb, will pop you back up to the top level gdb. See .gdbinit for details.
When you run gdb in the gdb source directory, it will read a ".gdbinit"
file that sets up some simple things to make debugging gdb easier. The
"info" command, when executed without a subcommand in a gdb being
debugged by gdb, will pop you back up to the top level gdb. See
.gdbinit for details.
I strongly recommend printing out the reference card and using it.
Send reference-card suggestions to bug-gdb@prep.ai.mit.edu, just like bugs.
@ -581,9 +556,8 @@ configure your distribution; this will put the machine dependent
routines for your local machine where they will be accessed first by a
M-period.
Also, make sure that you've compiled gdb with your local cc or taken
appropriate precautions regarding ansification of include files. See
the Makefile for more information.
Also, make sure that you've either compiled gdb with your local cc, or
have run `fixincludes' if you are compiling with gcc.
(this is for editing this file with GNU emacs)
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