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                What has changed in GDB?

             (Organized release by release)

*** Changes in GDB 5.3:

* GNU/Linux shared library multi-threaded performance improved.

When debugging a multi-threaded application on GNU/Linux, GDB now uses

`/proc', in preference to `ptrace' for memory reads.  This may result

in an improvement in the start-up time of multi-threaded, shared

library applications when run under GDB.  One GDB user writes: ``loads

shared libs like mad''.

* ``gdbserver'' now supports multi-threaded applications on some targets

Support for debugging multi-threaded applications which use

the GNU/Linux LinuxThreads package has been added for

arm*-*-linux*-gnu*, i[3456]86-*-linux*-gnu*, mips*-*-linux*-gnu*,

powerpc*-*-linux*-gnu*, and sh*-*-linux*-gnu*.

* GDB now supports C/C++ preprocessor macros.

GDB now expands preprocessor macro invocations in C/C++ expressions,

and provides various commands for showing macro definitions and how

they expand.

The new command `macro expand EXPRESSION' expands any macro

invocations in expression, and shows the result.

The new command `show macro MACRO-NAME' shows the definition of the

macro named MACRO-NAME, and where it was defined.

Most compilers don't include information about macros in the debugging

information by default.  In GCC 3.1, for example, you need to compile

your program with the options `-gdwarf-2 -g3'.  If the macro

information is present in the executable, GDB will read it.

* Multi-arched targets.

DEC Alpha (partial)                             alpha*-*-*

DEC VAX (partial)                               vax-*-*

NEC V850                                        v850-*-*

National Semiconductor NS32000 (partial)        ns32k-*-*

Motorola 68000 (partial)                        m68k-*-*

Motorola MCORE                                  mcore-*-*

* New targets.

Fujitsu FRV architecture added by Red Hat       frv*-*-*

* New native configurations

Alpha NetBSD                                    alpha*-*-netbsd*

SH NetBSD                                       sh*-*-netbsdelf*

MIPS NetBSD                                     mips*-*-netbsd*

UltraSPARC NetBSD                               sparc64-*-netbsd*

* OBSOLETE configurations and files

Configurations that have been declared obsolete in this release have

been commented out.  Unless there is activity to revive these

configurations, the next release of GDB will have their sources

permanently REMOVED.

Mitsubishi D30V                                 d30v-*-*

OS/9000                                         i[34]86-*-os9k

IBM AIX PS/2                                    i[3456]86-*-aix

Fujitsu FR30                                    fr30-*-elf*

Motorola Delta 88000 running Sys V              m88k-motorola-sysv  or  delta88

Argonaut Risc Chip (ARC)                        arc-*-*

i386 running Mach 3.0                           i[3456]86-*-mach3*

i386 running Mach                               i[3456]86-*-mach*

i386 running OSF/1                              i[3456]86-*osf1mk*

HP/Apollo 68k Family                            m68*-apollo*-sysv*,

                                                m68*-apollo*-bsd*,

                                                m68*-hp-bsd*, m68*-hp-hpux*

I960 with MON960                                i960-*-coff

* OBSOLETE languages

CHILL, a Pascal like language used by telecommunications companies.

* REMOVED configurations and files

AMD 29k family via UDI                          a29k-amd-udi, udi29k

A29K VxWorks                                    a29k-*-vxworks

AMD 29000 embedded, using EBMON                 a29k-none-none

AMD 29000 embedded with COFF                    a29k-none-coff

AMD 29000 embedded with a.out                   a29k-none-aout

testsuite/gdb.hp/gdb.threads-hp/                directory

* New command "set max-user-call-depth "

This command allows the user to limit the call depth of user-defined

commands.  The default is 1024.

* Changes in FreeBSD/i386 native debugging.

Support for the "generate-core-file" has been added.

* New commands "dump", "append", and "restore".

These commands allow data to be copied from target memory

to a bfd-format or binary file (dump and append), and back

from a file into memory (restore).

* Improved "next/step" support on multi-processor Alpha Tru64.

The previous single-step mechanism could cause unpredictable problems,

including the random appearance of SIGSEGV or SIGTRAP signals. The use

of a software single-step mechanism prevents this.

*** Changes in GDB 5.2.1:

* New targets.

Atmel AVR                                       avr*-*-*

* Bug fixes

gdb/182: gdb/323: gdb/237: On alpha, gdb was reporting:

mdebugread.c:2443: gdb-internal-error: sect_index_data not initialized

Fix, by Joel Brobecker imported from mainline.

gdb/439: gdb/291: On some ELF object files, gdb was reporting:

dwarf2read.c:1072: gdb-internal-error: sect_index_text not initialize

Fix, by Fred Fish, imported from mainline.

Dwarf2 .debug_frame & .eh_frame handler improved in many ways.

Surprisingly enough, it works now.

By Michal Ludvig, imported from mainline.

i386 hardware watchpoint support:

avoid misses on second run for some targets.

By Pierre Muller, imported from mainline.

*** Changes in GDB 5.2:

* New command "set trust-readonly-sections on[off]".

This command is a hint that tells gdb that read-only sections

really are read-only (ie. that their contents will not change).

In this mode, gdb will go to the object file rather than the

target to read memory from read-only sections (such as ".text").

This can be a significant performance improvement on some

(notably embedded) targets.

* New command "generate-core-file" (or "gcore").

This new gdb command allows the user to drop a core file of the child

process state at any time.  So far it's been implemented only for

GNU/Linux and Solaris, but should be relatively easily ported to other

hosts.  Argument is core file name (defaults to core.).

* New command line option

GDB now accepts --pid or -p followed by a process id.

* Change in command line behavior -- corefiles vs. process ids.

There is a subtle behavior in the way in which GDB handles

command line arguments.  The first non-flag argument is always

a program to debug, but the second non-flag argument may either

be a corefile or a process id.  Previously, GDB would attempt to

open the second argument as a corefile, and if that failed, would

issue a superfluous error message and then attempt to attach it as

a process.  Now, if the second argument begins with a non-digit,

it will be treated as a corefile.  If it begins with a digit,

GDB will attempt to attach it as a process, and if no such process

is found, will then attempt to open it as a corefile.

* Changes in ARM configurations.

Multi-arch support is enabled for all ARM configurations.  The ARM/NetBSD

configuration is fully multi-arch.

* New native configurations

ARM NetBSD                                      arm*-*-netbsd*

x86 OpenBSD                                     i[3456]86-*-openbsd*

AMD x86-64 running GNU/Linux                    x86_64-*-linux-*

Sparc64 running FreeBSD                         sparc64-*-freebsd*

* New targets

Sanyo XStormy16                                 xstormy16-elf

* OBSOLETE configurations and files

Configurations that have been declared obsolete in this release have

been commented out.  Unless there is activity to revive these

configurations, the next release of GDB will have their sources

permanently REMOVED.

AMD 29k family via UDI                          a29k-amd-udi, udi29k

A29K VxWorks                                    a29k-*-vxworks

AMD 29000 embedded, using EBMON                 a29k-none-none

AMD 29000 embedded with COFF                    a29k-none-coff

AMD 29000 embedded with a.out                   a29k-none-aout

testsuite/gdb.hp/gdb.threads-hp/                directory

* REMOVED configurations and files

TI TMS320C80                                    tic80-*-*

WDC 65816                                       w65-*-*

PowerPC Solaris                                 powerpcle-*-solaris*

PowerPC Windows NT                              powerpcle-*-cygwin32

PowerPC Netware                                 powerpc-*-netware*

Harris/CXUX m88k                                m88*-harris-cxux*

Most ns32k hosts and targets                    ns32k-*-mach3* ns32k-umax-*

                                                ns32k-utek-sysv* ns32k-utek-*

SunOS 4.0.Xi on i386                            i[3456]86-*-sunos*

Ultracomputer (29K) running Sym1                a29k-nyu-sym1 a29k-*-kern*

Sony NEWS (68K) running NEWSOS 3.x              m68*-sony-sysv news

ISI Optimum V (3.05) under 4.3bsd.              m68*-isi-*

Apple Macintosh (MPW) host and target           N/A host, powerpc-*-macos*

* Changes to command line processing

The new `--args' feature can be used to specify command-line arguments

for the inferior from gdb's command line.

* Changes to key bindings

There is a new `operate-and-get-next' function bound to `C-o'.

*** Changes in GDB 5.1.1

Fix compile problem on DJGPP.

Fix a problem with floating-point registers on the i386 being

corrupted.

Fix to stop GDB crashing on .debug_str debug info.

Numerous documentation fixes.

Numerous testsuite fixes.

*** Changes in GDB 5.1:

* New native configurations

Alpha FreeBSD                                   alpha*-*-freebsd*

x86 FreeBSD 3.x and 4.x                         i[3456]86*-freebsd[34]*

MIPS GNU/Linux                                  mips*-*-linux*

MIPS SGI Irix 6.x                               mips*-sgi-irix6*

ia64 AIX                                        ia64-*-aix*

s390 and s390x GNU/Linux                        {s390,s390x}-*-linux*

* New targets

Motorola 68HC11 and 68HC12                      m68hc11-elf

CRIS                                            cris-axis

UltraSparc running GNU/Linux                    sparc64-*-linux*

* OBSOLETE configurations and files

x86 FreeBSD before 2.2                          i[3456]86*-freebsd{1,2.[01]}*,

Harris/CXUX m88k                                m88*-harris-cxux*

Most ns32k hosts and targets                    ns32k-*-mach3* ns32k-umax-*

                                                ns32k-utek-sysv* ns32k-utek-*

TI TMS320C80                                    tic80-*-*

WDC 65816                                       w65-*-*

Ultracomputer (29K) running Sym1                a29k-nyu-sym1 a29k-*-kern*

PowerPC Solaris                                 powerpcle-*-solaris*

PowerPC Windows NT                              powerpcle-*-cygwin32

PowerPC Netware                                 powerpc-*-netware*

SunOS 4.0.Xi on i386                            i[3456]86-*-sunos*

Sony NEWS (68K) running NEWSOS 3.x              m68*-sony-sysv news

ISI Optimum V (3.05) under 4.3bsd.              m68*-isi-*

Apple Macintosh (MPW) host                      N/A

stuff.c (Program to stuff files into a specially prepared space in kdb)

kdb-start.c (Main loop for the standalone kernel debugger)

Configurations that have been declared obsolete in this release have

been commented out.  Unless there is activity to revive these

configurations, the next release of GDB will have their sources

permanently REMOVED.

* REMOVED configurations and files

Altos 3068                                      m68*-altos-*

Convex                                          c1-*-*, c2-*-*

Pyramid                                         pyramid-*-*

ARM RISCix                                      arm-*-* (as host)

Tahoe                                           tahoe-*-*

ser-ocd.c                                       *-*-*

* GDB has been converted to ISO C.

GDB's source code has been converted to ISO C.  In particular, the

sources are fully protoized, and rely on standard headers being

present.

* Other news:

* "info symbol" works on platforms which use COFF, ECOFF, XCOFF, and NLM.

* The MI enabled by default.

The new machine oriented interface (MI) introduced in GDB 5.0 has been

revised and enabled by default.  Packages which use GDB as a debugging

engine behind a UI or another front end are encouraged to switch to

using the GDB/MI interface, instead of the old annotations interface

which is now deprecated.

* Support for debugging Pascal programs.

GDB now includes support for debugging Pascal programs.  The following

main features are supported:

    - Pascal-specific data types such as sets;

    - automatic recognition of Pascal sources based on file-name

      extension;

    - Pascal-style display of data types, variables, and functions;

    - a Pascal expression parser.

However, some important features are not yet supported.

    - Pascal string operations are not supported at all;

    - there are some problems with boolean types;

    - Pascal type hexadecimal constants are not supported

      because they conflict with the internal variables format;

    - support for Pascal objects and classes is not full yet;

    - unlike Pascal, GDB is case-sensitive for symbol names.

* Changes in completion.

Commands such as `shell', `run' and `set args', which pass arguments

to inferior programs, now complete on file names, similar to what

users expect at the shell prompt.

Commands which accept locations, such as `disassemble', `print',

`breakpoint', `until', etc. now complete on filenames as well as

program symbols.  Thus, if you type "break foob TAB", and the source

files linked into the programs include `foobar.c', that file name will

be one of the candidates for completion.  However, file names are not

considered for completion after you typed a colon that delimits a file

name from a name of a function in that file, as in "break foo.c:bar".

`set demangle-style' completes on available demangling styles.

* New platform-independent commands:

It is now possible to define a post-hook for a command as well as a

hook that runs before the command.  For more details, see the

documentation of `hookpost' in the GDB manual.

* Changes in GNU/Linux native debugging.

Support for debugging multi-threaded programs has been completely

revised for all platforms except m68k and sparc.  You can now debug as

many threads as your system allows you to have.

Attach/detach is supported for multi-threaded programs.

Support for SSE registers was added for x86.  This doesn't work for

multi-threaded programs though.

* Changes in MIPS configurations.

Multi-arch support is enabled for all MIPS configurations.

GDB can now be built as native debugger on SGI Irix 6.x systems for

debugging n32 executables.  (Debugging 64-bit executables is not yet

supported.)

* Unified support for hardware watchpoints in all x86 configurations.

Most (if not all) native x86 configurations support hardware-assisted

breakpoints and watchpoints in a unified manner.  This support

implements debug register sharing between watchpoints, which allows to

put a virtually infinite number of watchpoints on the same address,

and also supports watching regions up to 16 bytes with several debug

registers.

The new maintenance command `maintenance show-debug-regs' toggles

debugging print-outs in functions that insert, remove, and test

watchpoints and hardware breakpoints.

* Changes in the DJGPP native configuration.

New command ``info dos sysinfo'' displays assorted information about

the CPU, OS, memory, and DPMI server.

New commands ``info dos gdt'', ``info dos ldt'', and ``info dos idt''

display information about segment descriptors stored in GDT, LDT, and

IDT.

New commands ``info dos pde'' and ``info dos pte'' display entries

from Page Directory and Page Tables (for now works with CWSDPMI only).

New command ``info dos address-pte'' displays the Page Table entry for

a given linear address.

GDB can now pass command lines longer than 126 characters to the

program being debugged (requires an update to the libdbg.a library

which is part of the DJGPP development kit).

DWARF2 debug info is now supported.

It is now possible to `step' and `next' through calls to `longjmp'.

* Changes in documentation.

All GDB documentation was converted to GFDL, the GNU Free

Documentation License.

Tracepoints-related commands are now fully documented in the GDB

manual.

TUI, the Text-mode User Interface, is now documented in the manual.

Tracepoints-related commands are now fully documented in the GDB

manual.

The "GDB Internals" manual now has an index.  It also includes

documentation of `ui_out' functions, GDB coding standards, x86

hardware watchpoints, and memory region attributes.

* GDB's version number moved to ``version.in''

The Makefile variable VERSION has been replaced by the file

``version.in''.  People creating GDB distributions should update the

contents of this file.

* gdba.el deleted

GUD support is now a standard part of the EMACS distribution.

*** Changes in GDB 5.0:

* Improved support for debugging FP programs on x86 targets

Unified and much-improved support for debugging floating-point

programs on all x86 targets.  In particular, ``info float'' now

displays the FP registers in the same format on all x86 targets, with

greater level of detail.

* Improvements and bugfixes in hardware-assisted watchpoints

It is now possible to watch array elements, struct members, and

bitfields with hardware-assisted watchpoints.  Data-read watchpoints

on x86 targets no longer erroneously trigger when the address is

written.

* Improvements in the native DJGPP version of GDB

The distribution now includes all the scripts and auxiliary files

necessary to build the native DJGPP version on MS-DOS/MS-Windows

machines ``out of the box''.

The DJGPP version can now debug programs that use signals.  It is

possible to catch signals that happened in the debuggee, deliver

signals to it, interrupt it with Ctrl-C, etc.  (Previously, a signal

would kill the program being debugged.)  Programs that hook hardware

interrupts (keyboard, timer, etc.) can also be debugged.

It is now possible to debug DJGPP programs that redirect their

standard handles or switch them to raw (as opposed to cooked) mode, or

even close them.  The command ``run < foo > bar'' works as expected,

and ``info terminal'' reports useful information about the debuggee's

terminal, including raw/cooked mode, redirection, etc.

The DJGPP version now uses termios functions for console I/O, which

enables debugging graphics programs.  Interrupting GDB with Ctrl-C

also works.

DOS-style file names with drive letters are now fully supported by

GDB.

It is now possible to debug DJGPP programs that switch their working

directory.  It is also possible to rerun the debuggee any number of

times without restarting GDB; thus, you can use the same setup,

breakpoints, etc. for many debugging sessions.

* New native configurations

ARM GNU/Linux                                   arm*-*-linux*

PowerPC GNU/Linux                               powerpc-*-linux*

* New targets

Motorola MCore                                  mcore-*-*

x86 VxWorks                                     i[3456]86-*-vxworks*

PowerPC VxWorks                                 powerpc-*-vxworks*

TI TMS320C80                                    tic80-*-*

* OBSOLETE configurations

Altos 3068                                      m68*-altos-*

Convex                                          c1-*-*, c2-*-*

Pyramid                                         pyramid-*-*

ARM RISCix                                      arm-*-* (as host)

Tahoe                                           tahoe-*-*

Configurations that have been declared obsolete will be commented out,

but the code will be left in place.  If there is no activity to revive

these configurations before the next release of GDB, the sources will

be permanently REMOVED.

* Gould support removed

Support for the Gould PowerNode and NP1 has been removed.

* New features for SVR4

On SVR4 native platforms (such as Solaris), if you attach to a process

without first loading a symbol file, GDB will now attempt to locate and

load symbols from the running process's executable file.

* Many C++ enhancements

C++ support has been greatly improved. Overload resolution now works properly

in almost all cases. RTTI support is on the way.

* Remote targets can connect to a sub-program

A popen(3) style serial-device has been added.  This device starts a

sub-process (such as a stand-alone simulator) and then communicates

with that.  The sub-program to run is specified using the syntax

``| '' vis:

        (gdb) set remotedebug 1

        (gdb) target extended-remote |mn10300-elf-sim program-args

* MIPS 64 remote protocol

A long standing bug in the mips64 remote protocol where by GDB

expected certain 32 bit registers (ex SR) to be transfered as 32

instead of 64 bits has been fixed.

The command ``set remote-mips64-transfers-32bit-regs on'' has been

added to provide backward compatibility with older versions of GDB.

* ``set remotebinarydownload'' replaced by ``set remote X-packet''

The command ``set remotebinarydownload'' command has been replaced by

``set remote X-packet''.  Other commands in ``set remote'' family

include ``set remote P-packet''.

* Breakpoint commands accept ranges.

The breakpoint commands ``enable'', ``disable'', and ``delete'' now

accept a range of breakpoints, e.g. ``5-7''.  The tracepoint command

``tracepoint passcount'' also accepts a range of tracepoints.

* ``apropos'' command added.

The ``apropos'' command searches through command names and

documentation strings, printing out matches, making it much easier to

try to find a command that does what you are looking for.

* New MI interface

A new machine oriented interface (MI) has been added to GDB.  This

interface is designed for debug environments running GDB as a separate

process.  This is part of the long term libGDB project.  See the

"GDB/MI" chapter of the GDB manual for further information.  It can be

enabled by configuring with:

        .../configure --enable-gdbmi

*** Changes in GDB-4.18:

* New native configurations

HP-UX 10.20                                     hppa*-*-hpux10.20

HP-UX 11.x                                      hppa*-*-hpux11.0*

M68K GNU/Linux                                  m68*-*-linux*

* New targets

Fujitsu FR30                                    fr30-*-elf*

Intel StrongARM                                 strongarm-*-*

Mitsubishi D30V                                 d30v-*-*

* OBSOLETE configurations

Gould PowerNode, NP1                            np1-*-*, pn-*-*

Configurations that have been declared obsolete will be commented out,

but the code will be left in place.  If there is no activity to revive

these configurations before the next release of GDB, the sources will

be permanently REMOVED.

* ANSI/ISO C

As a compatibility experiment, GDB's source files buildsym.h and

buildsym.c have been converted to pure standard C, no longer

containing any K&R compatibility code.  We believe that all systems in

use today either come with a standard C compiler, or have a GCC port

available.  If this is not true, please report the affected

configuration to bug-gdb@gnu.org immediately.  See the README file for

information about getting a standard C compiler if you don't have one

already.

* Readline 2.2

GDB now uses readline 2.2.

* set extension-language

You can now control the mapping between filename extensions and source

languages by using the `set extension-language' command.  For instance,

you can ask GDB to treat .c files as C++ by saying

        set extension-language .c c++

The command `info extensions' lists all of the recognized extensions

and their associated languages.

* Setting processor type for PowerPC and RS/6000

When GDB is configured for a powerpc*-*-* or an rs6000*-*-* target,

you can use the `set processor' command to specify what variant of the

PowerPC family you are debugging.  The command

        set processor NAME

sets the PowerPC/RS6000 variant to NAME.  GDB knows about the

following PowerPC and RS6000 variants:

  ppc-uisa  PowerPC UISA - a PPC processor as viewed by user-level code

  rs6000    IBM RS6000 ("POWER") architecture, user-level view

  403       IBM PowerPC 403

  403GC     IBM PowerPC 403GC

  505       Motorola PowerPC 505

  860       Motorola PowerPC 860 or 850

  601       Motorola PowerPC 601

  602       Motorola PowerPC 602

  603       Motorola/IBM PowerPC 603 or 603e

  604       Motorola PowerPC 604 or 604e

  750       Motorola/IBM PowerPC 750 or 750

At the moment, this command just tells GDB what to name the

special-purpose processor registers.  Since almost all the affected

registers are inaccessible to user-level programs, this command is

only useful for remote debugging in its present form.

* HP-UX support

Thanks to a major code donation from Hewlett-Packard, GDB now has much

more extensive support for HP-UX.  Added features include shared

library support, kernel threads and hardware watchpoints for 11.00,

support for HP's ANSI C and C++ compilers, and a compatibility mode

for xdb and dbx commands.

* Catchpoints

HP's donation includes the new concept of catchpoints, which is a

generalization of the old catch command.  On HP-UX, it is now possible

to catch exec, fork, and vfork, as well as library loading.

This means that the existing catch command has changed; its first

argument now specifies the type of catch to be set up.  See the

output of "help catch" for a list of catchpoint types.

* Debugging across forks

On HP-UX, you can choose which process to debug when a fork() happens

in the inferior.

* TUI

HP has donated a curses-based terminal user interface (TUI).  To get

it, build with --enable-tui.  Although this can be enabled for any

configuration, at present it only works for native HP debugging.

* GDB remote protocol additions

A new protocol packet 'X' that writes binary data is now available.

Default behavior is to try 'X', then drop back to 'M' if the stub

fails to respond.  The settable variable `remotebinarydownload'

allows explicit control over the use of 'X'.

For 64-bit targets, the memory packets ('M' and 'm') can now contain a

full 64-bit address.  The command

        set remoteaddresssize 32

can be used to revert to the old behaviour.  For existing remote stubs

the change should not be noticed, as the additional address information

will be discarded.

In order to assist in debugging stubs, you may use the maintenance

command `packet' to send any text string to the stub.  For instance,

        maint packet heythere

sends the packet "$heythere#".  Note that it is very easy to

disrupt a debugging session by sending the wrong packet at the wrong

time.

The compare-sections command allows you to compare section data on the

target to what is in the executable file without uploading or

downloading, by comparing CRC checksums.

* Tracing can collect general expressions

You may now collect general expressions at tracepoints.  This requires

further additions to the target-side stub; see tracepoint.c and

doc/agentexpr.texi for further details.

* mask-address variable for Mips

For Mips targets, you may control the zeroing of the upper 32 bits of

a 64-bit address by entering `set mask-address on'.  This is mainly

of interest to users of embedded R4xxx and R5xxx processors.

* Higher serial baud rates

GDB's serial code now allows you to specify baud rates 57600, 115200,

230400, and 460800 baud.  (Note that your host system may not be able

to achieve all of these rates.)

* i960 simulator

The i960 configuration now includes an initial implementation of a

builtin simulator, contributed by Jim Wilson.

*** Changes in GDB-4.17:

* New native configurations

Alpha GNU/Linux                                 alpha*-*-linux*

Unixware 2.x                                    i[3456]86-unixware2*

Irix 6.x                                        mips*-sgi-irix6*

PowerPC GNU/Linux                               powerpc-*-linux*

PowerPC Solaris                                 powerpcle-*-solaris*

Sparc GNU/Linux                                 sparc-*-linux*

Motorola sysV68 R3V7.1                          m68k-motorola-sysv

* New targets

Argonaut Risc Chip (ARC)                        arc-*-*

Hitachi H8/300S                                 h8300*-*-*

Matsushita MN10200 w/simulator                  mn10200-*-*

Matsushita MN10300 w/simulator                  mn10300-*-*

MIPS NEC VR4100                                 mips64*vr4100*{,el}-*-elf*

MIPS NEC VR5000                                 mips64*vr5000*{,el}-*-elf*

MIPS Toshiba TX39                               mips64*tx39*{,el}-*-elf*

Mitsubishi D10V w/simulator                     d10v-*-*

Mitsubishi M32R/D w/simulator                   m32r-*-elf*

Tsqware Sparclet                                sparclet-*-*

NEC V850 w/simulator                            v850-*-*

* New debugging protocols

ARM with RDI protocol                           arm*-*-*

M68K with dBUG monitor                          m68*-*-{aout,coff,elf}

DDB and LSI variants of PMON protocol           mips*-*-*

PowerPC with DINK32 monitor                     powerpc{,le}-*-eabi

PowerPC with SDS protocol                       powerpc{,le}-*-eabi

Macraigor OCD (Wiggler) devices                 powerpc{,le}-*-eabi

* DWARF 2

All configurations can now understand and use the DWARF 2 debugging

format.  The choice is automatic, if the symbol file contains DWARF 2

information.

* Java frontend

GDB now includes basic Java language support.  This support is

only useful with Java compilers that produce native machine code.

* solib-absolute-prefix and solib-search-path

For SunOS and SVR4 shared libraries, you may now set the prefix for

loading absolute shared library symbol files, and the search path for

locating non-absolute shared library symbol files.

* Live range splitting

GDB can now effectively debug code for which GCC has performed live

range splitting as part of its optimization.  See gdb/doc/LRS for

more details on the expected format of the stabs information.

* Hurd support

GDB's support for the GNU Hurd, including thread debugging, has been

updated to work with current versions of the Hurd.

* ARM Thumb support

GDB's ARM target configuration now handles the ARM7T (Thumb) 16-bit

instruction set.  ARM GDB automatically detects when Thumb

instructions are in use, and adjusts disassembly and backtracing

accordingly.

* MIPS16 support

GDB's MIPS target configurations now handle the MIP16 16-bit

instruction set.

* Overlay support

GDB now includes support for overlays; if an executable has been

linked such that multiple sections are based at the same address, GDB

will decide which section to use for symbolic info.  You can choose to

control the decision manually, using overlay commands, or implement

additional target-side support and use "overlay load-target" to bring

in the overlay mapping.  Do "help overlay" for more detail.

* info symbol

The command "info symbol 
" displays information about

the symbol at the specified address.

* Trace support

The standard remote protocol now includes an extension that allows

asynchronous collection and display of trace data.  This requires

extensive support in the target-side debugging stub.  Tracing mode

includes a new interaction mode in GDB and new commands: see the

file tracepoint.c for more details.

* MIPS simulator

Configurations for embedded MIPS now include a simulator contributed

by Cygnus Solutions.  The simulator supports the instruction sets

of most MIPS variants.

* Sparc simulator

Sparc configurations may now include the ERC32 simulator contributed

by the European Space Agency.  The simulator is not built into

Sparc targets by default; configure with --enable-sim to include it.

* set architecture

For target configurations that may include multiple variants of a

basic architecture (such as MIPS and SH), you may now set the

architecture explicitly.  "set arch" sets, "info arch" lists

the possible architectures.

*** Changes in GDB-4.16:

* New native configurations

Windows 95, x86 Windows NT                      i[345]86-*-cygwin32

M68K NetBSD                                     m68k-*-netbsd*

PowerPC AIX 4.x                                 powerpc-*-aix*

PowerPC MacOS                                   powerpc-*-macos*

PowerPC Windows NT                              powerpcle-*-cygwin32

RS/6000 AIX 4.x                                 rs6000-*-aix4*

* New targets

ARM with RDP protocol                           arm-*-*

I960 with MON960                                i960-*-coff

MIPS VxWorks                                    mips*-*-vxworks*

MIPS VR4300 with PMON                           mips64*vr4300{,el}-*-elf*

PowerPC with PPCBUG monitor                     powerpc{,le}-*-eabi*

Hitachi SH3                                     sh-*-*

Matra Sparclet                                  sparclet-*-*

* PowerPC simulator

The powerpc-eabi configuration now includes the PSIM simulator,

contributed by Andrew Cagney, with assistance from Mike Meissner.

PSIM is a very elaborate model of the PowerPC, including not only

basic instruction set execution, but also details of execution unit

performance and I/O hardware.  See sim/ppc/README for more details.

* Solaris 2.5

GDB now works with Solaris 2.5.

* Windows 95/NT native

GDB will now work as a native debugger on Windows 95 and Windows NT.

To build it from source, you must use the "gnu-win32" environment,

which uses a DLL to emulate enough of Unix to run the GNU tools.

Further information, binaries, and sources are available at

ftp.cygnus.com, under pub/gnu-win32.

* dont-repeat command

If a user-defined command includes the command `dont-repeat', then the

command will not be repeated if the user just types return.  This is

useful if the command is time-consuming to run, so that accidental

extra keystrokes don't run the same command many times.

* Send break instead of ^C

The standard remote protocol now includes an option to send a break

rather than a ^C to the target in order to interrupt it.  By default,

GDB will send ^C; to send a break, set the variable `remotebreak' to 1.

* Remote protocol timeout

The standard remote protocol includes a new variable `remotetimeout'

that allows you to set the number of seconds before GDB gives up trying

to read from the target.  The default value is 2.

* Automatic tracking of dynamic object loading (HPUX and Solaris only)

By default GDB will automatically keep track of objects as they are

loaded and unloaded by the dynamic linker.  By using the command `set

stop-on-solib-events 1' you can arrange for GDB to stop the inferior

when shared library events occur, thus allowing you to set breakpoints

in shared libraries which are explicitly loaded by the inferior.

Note this feature does not work on hpux8.  On hpux9 you must link

/usr/lib/end.o into your program.  This feature should work

automatically on hpux10.

* Irix 5.x hardware watchpoint support

Irix 5 configurations now support the use of hardware watchpoints.

* Mips protocol "SYN garbage limit"

When debugging a Mips target using the `target mips' protocol, you

may set the number of characters that GDB will ignore by setting

the `syn-garbage-limit'.  A value of -1 means that GDB will ignore

every character.  The default value is 1050.

* Recording and replaying remote debug sessions

If you set `remotelogfile' to the name of a file, gdb will write to it

a recording of a remote debug session.  This recording may then be

replayed back to gdb using "gdbreplay".  See gdbserver/README for

details.  This is useful when you have a problem with GDB while doing

remote debugging; you can make a recording of the session and send it

to someone else, who can then recreate the problem.