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diff --git a/gdb/NEWS b/gdb/NEWS new file mode 100644 index 00000000000..e6aaba318a1 --- /dev/null +++ b/gdb/NEWS @@ -0,0 +1,1611 @@ + What has changed in GDB? + (Organized release by release) + +*** Changes in GDB-4.18: + +* New native configurations + +HP-UX 10.20 hppa*-*-hpux10.20 +HP-UX 11.x hppa*-*-hpux11.0* +M68K 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#<checksum>". 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 <address>" 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. + +* Speedups for remote debugging + +GDB includes speedups for downloading and stepping MIPS systems using +the IDT monitor, fast downloads to the Hitachi SH E7000 emulator, +and more efficient S-record downloading. + +* Memory use reductions and statistics collection + +GDB now uses less memory and reports statistics about memory usage. +Try the `maint print statistics' command, for example. + +*** Changes in GDB-4.15: + +* Psymtabs for XCOFF + +The symbol reader for AIX GDB now uses partial symbol tables. This +can greatly improve startup time, especially for large executables. + +* Remote targets use caching + +Remote targets now use a data cache to speed up communication with the +remote side. The data cache could lead to incorrect results because +it doesn't know about volatile variables, thus making it impossible to +debug targets which use memory mapped I/O devices. `set remotecache +off' turns the the data cache off. + +* Remote targets may have threads + +The standard remote protocol now includes support for multiple threads +in the target system, using new protocol commands 'H' and 'T'. See +gdb/remote.c for details. + +* NetROM support + +If GDB is configured with `--enable-netrom', then it will include +support for the NetROM ROM emulator from XLNT Designs. The NetROM +acts as though it is a bank of ROM on the target board, but you can +write into it over the network. GDB's support consists only of +support for fast loading into the emulated ROM; to debug, you must use +another protocol, such as standard remote protocol. The usual +sequence is something like + + target nrom <netrom-hostname> + load <prog> + target remote <netrom-hostname>:1235 + +* Macintosh host + +GDB now includes support for the Apple Macintosh, as a host only. It +may be run as either an MPW tool or as a standalone application, and +it can debug through the serial port. All the usual GDB commands are +available, but to the target command, you must supply "serial" as the +device type instead of "/dev/ttyXX". See mpw-README in the main +directory for more information on how to build. The MPW configuration +scripts */mpw-config.in support only a few targets, and only the +mips-idt-ecoff target has been tested. + +* Autoconf + +GDB configuration now uses autoconf. This is not user-visible, +but does simplify configuration and building. + +* hpux10 + +GDB now supports hpux10. + +*** Changes in GDB-4.14: + +* New native configurations + +x86 FreeBSD i[345]86-*-freebsd +x86 NetBSD i[345]86-*-netbsd +NS32k NetBSD ns32k-*-netbsd +Sparc NetBSD sparc-*-netbsd + +* New targets + +A29K VxWorks a29k-*-vxworks +HP PA PRO embedded (WinBond W89K & Oki OP50N) hppa*-*-pro* +CPU32 EST-300 emulator m68*-*-est* +PowerPC ELF powerpc-*-elf +WDC 65816 w65-*-* + +* Alpha OSF/1 support for procfs + +GDB now supports procfs under OSF/1-2.x and higher, which makes it +possible to attach to running processes. As the mounting of the /proc +filesystem is optional on the Alpha, GDB automatically determines +the availability of /proc during startup. This can lead to problems +if /proc is unmounted after GDB has been started. + +* Arguments to user-defined commands + +User commands may accept up to 10 arguments separated by whitespace. +Arguments are accessed within the user command via $arg0..$arg9. A +trivial example: +define adder + print $arg0 + $arg1 + $arg2 + +To execute the command use: +adder 1 2 3 + +Defines the command "adder" which prints the sum of its three arguments. +Note the arguments are text substitutions, so they may reference variables, +use complex expressions, or even perform inferior function calls. + +* New `if' and `while' commands + +This makes it possible to write more sophisticated user-defined +commands. Both commands take a single argument, which is the +expression to evaluate, and must be followed by the commands to +execute, one per line, if the expression is nonzero, the list being +terminated by the word `end'. The `if' command list may include an +`else' word, which causes the following commands to be executed only +if the expression is zero. + +* Fortran source language mode + +GDB now includes partial support for Fortran 77. It will recognize +Fortran programs and can evaluate a subset of Fortran expressions, but +variables and functions may not be handled correctly. GDB will work +with G77, but does not yet know much about symbols emitted by other +Fortran compilers. + +* Better HPUX support + +Most debugging facilities now work on dynamic executables for HPPAs +running hpux9 or later. You can attach to running dynamically linked +processes, but by default the dynamic libraries will be read-only, so +for instance you won't be able to put breakpoints in them. To change +that behavior do the following before running the program: + + adb -w a.out + __dld_flags?W 0x5 + control-d + +This will cause the libraries to be mapped private and read-write. +To revert to the normal behavior, do this: + + adb -w a.out + __dld_flags?W 0x4 + control-d + +You cannot set breakpoints or examine data in the library until after +the library is loaded if the function/data symbols do not have +external linkage. + +GDB can now also read debug symbols produced by the HP C compiler on +HPPAs (sorry, no C++, Fortran or 68k support). + +* Target byte order now dynamically selectable + +You can choose which byte order to use with a target system, via the +commands "set endian big" and "set endian little", and you can see the +current setting by using "show endian". You can also give the command +"set endian auto", in which case GDB will use the byte order +associated with the executable. Currently, only embedded MIPS +configurations support dynamic selection of target byte order. + +* New DOS host serial code + +This version uses DPMI interrupts to handle buffered I/O, so you +no longer need to run asynctsr when debugging boards connected to +a PC's serial port. + +*** Changes in GDB-4.13: + +* New "complete" command + +This lists all the possible completions for the rest of the line, if it +were to be given as a command itself. This is intended for use by emacs. + +* Trailing space optional in prompt + +"set prompt" no longer adds a space for you after the prompt you set. This +allows you to set a prompt which ends in a space or one that does not. + +* Breakpoint hit counts + +"info break" now displays a count of the number of times the breakpoint +has been hit. This is especially useful in conjunction with "ignore"; you +can ignore a large number of breakpoint hits, look at the breakpoint info +to see how many times the breakpoint was hit, then run again, ignoring one +less than that number, and this will get you quickly to the last hit of +that breakpoint. + +* Ability to stop printing at NULL character + +"set print null-stop" will cause GDB to stop printing the characters of +an array when the first NULL is encountered. This is useful when large +arrays actually contain only short strings. + +* Shared library breakpoints + +In SunOS 4.x, SVR4, and Alpha OSF/1 configurations, you can now set +breakpoints in shared libraries before the executable is run. + +* Hardware watchpoints + +There is a new hardware breakpoint for the watch command for sparclite +targets. See gdb/sparclite/hw_breakpoint.note. + +Hardware watchpoints are also now supported under Linux. + +* Annotations + +Annotations have been added. These are for use with graphical interfaces, +and are still experimental. Currently only gdba.el uses these. + +* Improved Irix 5 support + +GDB now works properly with Irix 5.2. + +* Improved HPPA support + +GDB now works properly with the latest GCC and GAS. + +* New native configurations + +Sequent PTX4 i[34]86-sequent-ptx4 +HPPA running OSF/1 hppa*-*-osf* +Atari TT running SVR4 m68*-*-sysv4* +RS/6000 LynxOS rs6000-*-lynxos* + +* New targets + +OS/9000 i[34]86-*-os9k +MIPS R4000 mips64*{,el}-*-{ecoff,elf} +Sparc64 sparc64-*-* + +* Hitachi SH7000 and E7000-PC ICE support + +There is now support for communicating with the Hitachi E7000-PC ICE. +This is available automatically when GDB is configured for the SH. + +* Fixes + +As usual, a variety of small fixes and improvements, both generic +and configuration-specific. See the ChangeLog for more detail. + +*** Changes in GDB-4.12: + +* Irix 5 is now supported + +* HPPA support + +GDB-4.12 on the HPPA has a number of changes which make it unable +to debug the output from the currently released versions of GCC and +GAS (GCC 2.5.8 and GAS-2.2 or PAGAS-1.36). Until the next major release +of GCC and GAS, versions of these tools designed to work with GDB-4.12 +can be retrieved via anonymous ftp from jaguar.cs.utah.edu:/dist. + + +*** Changes in GDB-4.11: + +* User visible changes: + +* Remote Debugging + +The "set remotedebug" option is now consistent between the mips remote +target, remote targets using the gdb-specific protocol, UDI (AMD's +debug protocol for the 29k) and the 88k bug monitor. It is now an +integer specifying a debug level (normally 0 or 1, but 2 means more +debugging info for the mips target). + +* DEC Alpha native support + +GDB now works on the DEC Alpha. GCC 2.4.5 does not produce usable +debug info, but GDB works fairly well with the DEC compiler and should +work with a future GCC release. See the README file for a few +Alpha-specific notes. + +* Preliminary thread implementation + +GDB now has preliminary thread support for both SGI/Irix and LynxOS. + +* LynxOS native and target support for 386 + +This release has been hosted on LynxOS 2.2, and also can be configured +to remotely debug programs running under LynxOS (see gdb/gdbserver/README +for details). + +* Improvements in C++ mangling/demangling. + +This release has much better g++ debugging, specifically in name +mangling/demangling, virtual function calls, print virtual table, +call methods, ...etc. + +*** Changes in GDB-4.10: + + * User visible changes: + +Remote debugging using the GDB-specific (`target remote') protocol now +supports the `load' command. This is only useful if you have some +other way of getting the stub to the target system, and you can put it +somewhere in memory where it won't get clobbered by the download. + +Filename completion now works. + +When run under emacs mode, the "info line" command now causes the +arrow to point to the line specified. Also, "info line" prints +addresses in symbolic form (as well as hex). + +All vxworks based targets now support a user settable option, called +vxworks-timeout. This option represents the number of seconds gdb +should wait for responses to rpc's. You might want to use this if +your vxworks target is, perhaps, a slow software simulator or happens +to be on the far side of a thin network line. + + * DEC alpha support + +This release contains support for using a DEC alpha as a GDB host for +cross debugging. Native alpha debugging is not supported yet. + + +*** Changes in GDB-4.9: + + * Testsuite + +This is the first GDB release which is accompanied by a matching testsuite. +The testsuite requires installation of dejagnu, which should be available +via ftp from most sites that carry GNU software. + + * C++ demangling + +'Cfront' style demangling has had its name changed to 'ARM' style, to +emphasize that it was written from the specifications in the C++ Annotated +Reference Manual, not necessarily to be compatible with AT&T cfront. Despite +disclaimers, it still generated too much confusion with users attempting to +use gdb with AT&T cfront. + + * Simulators + +GDB now uses a standard remote interface to a simulator library. +So far, the library contains simulators for the Zilog Z8001/2, the +Hitachi H8/300, H8/500 and Super-H. + + * New targets supported + +H8/300 simulator h8300-hitachi-hms or h8300hms +H8/500 simulator h8500-hitachi-hms or h8500hms +SH simulator sh-hitachi-hms or sh +Z8000 simulator z8k-zilog-none or z8ksim +IDT MIPS board over serial line mips-idt-ecoff + +Cross-debugging to GO32 targets is supported. It requires a custom +version of the i386-stub.c module which is integrated with the +GO32 memory extender. + + * New remote protocols + +MIPS remote debugging protocol. + + * New source languages supported + +This version includes preliminary support for Chill, a Pascal like language +used by telecommunications companies. Chill support is also being integrated +into the GNU compiler, but we don't know when it will be publically available. + + +*** Changes in GDB-4.8: + + * HP Precision Architecture supported + +GDB now supports HP PA-RISC machines running HPUX. A preliminary +version of this support was available as a set of patches from the +University of Utah. GDB does not support debugging of programs +compiled with the HP compiler, because HP will not document their file +format. Instead, you must use GCC (version 2.3.2 or later) and PA-GAS +(as available from jaguar.cs.utah.edu:/dist/pa-gas.u4.tar.Z). + +Many problems in the preliminary version have been fixed. + + * Faster and better demangling + +We have improved template demangling and fixed numerous bugs in the GNU style +demangler. It can now handle type modifiers such as `static' or `const'. Wide +character types (wchar_t) are now supported. Demangling of each symbol is now +only done once, and is cached when the symbol table for a file is read in. +This results in a small increase in memory usage for C programs, a moderate +increase in memory usage for C++ programs, and a fantastic speedup in +symbol lookups. + +`Cfront' style demangling still doesn't work with AT&T cfront. It was written +from the specifications in the Annotated Reference Manual, which AT&T's +compiler does not actually implement. + + * G++ multiple inheritance compiler problem + +In the 2.3.2 release of gcc/g++, how the compiler resolves multiple +inheritance lattices was reworked to properly discover ambiguities. We +recently found an example which causes this new algorithm to fail in a +very subtle way, producing bad debug information for those classes. +The file 'gcc.patch' (in this directory) can be applied to gcc to +circumvent the problem. A future GCC release will contain a complete +fix. + +The previous G++ debug info problem (mentioned below for the gdb-4.7 +release) is fixed in gcc version 2.3.2. + + * Improved configure script + +The `configure' script will now attempt to guess your system type if +you don't supply a host system type. The old scheme of supplying a +host system triplet is preferable over using this. All the magic is +done in the new `config.guess' script. Examine it for details. + +We have also brought our configure script much more in line with the FSF's +version. It now supports the --with-xxx options. In particular, +`--with-minimal-bfd' can be used to make the GDB binary image smaller. +The resulting GDB will not be able to read arbitrary object file formats -- +only the format ``expected'' to be used on the configured target system. +We hope to make this the default in a future release. + + * Documentation improvements + +There's new internal documentation on how to modify GDB, and how to +produce clean changes to the code. We implore people to read it +before submitting changes. + +The GDB manual uses new, sexy Texinfo conditionals, rather than arcane +M4 macros. The new texinfo.tex is provided in this release. Pre-built +`info' files are also provided. To build `info' files from scratch, +you will need the latest `makeinfo' release, which will be available in +a future texinfo-X.Y release. + +*NOTE* The new texinfo.tex can cause old versions of TeX to hang. +We're not sure exactly which versions have this problem, but it has +been seen in 3.0. We highly recommend upgrading to TeX version 3.141 +or better. If that isn't possible, there is a patch in +`texinfo/tex3patch' that will modify `texinfo/texinfo.tex' to work +around this problem. + + * New features + +GDB now supports array constants that can be used in expressions typed in by +the user. The syntax is `{element, element, ...}'. Ie: you can now type +`print {1, 2, 3}', and it will build up an array in memory malloc'd in +the target program. + +The new directory `gdb/sparclite' contains a program that demonstrates +how the sparc-stub.c remote stub runs on a Fujitsu SPARClite processor. + + * New native hosts supported + +HP/PA-RISC under HPUX using GNU tools hppa1.1-hp-hpux +386 CPUs running SCO Unix 3.2v4 i386-unknown-sco3.2v4 + + * New targets supported + +AMD 29k family via UDI a29k-amd-udi or udi29k + + * New file formats supported + +BFD now supports reading HP/PA-RISC executables (SOM file format?), +HPUX core files, and SCO 3.2v2 core files. + + * Major bug fixes + +Attaching to processes now works again; thanks for the many bug reports. + +We have also stomped on a bunch of core dumps caused by +printf_filtered("%s") problems. + +We eliminated a copyright problem on the rpc and ptrace header files +for VxWorks, which was discovered at the last minute during the 4.7 +release. You should now be able to build a VxWorks GDB. + +You can now interrupt gdb while an attached process is running. This +will cause the attached process to stop, and give control back to GDB. + +We fixed problems caused by using too many file descriptors +for reading symbols from object files and libraries. This was +especially a problem for programs that used many (~100) shared +libraries. + +The `step' command now only enters a subroutine if there is line number +information for the subroutine. Otherwise it acts like the `next' +command. Previously, `step' would enter subroutines if there was +any debugging information about the routine. This avoids problems +when using `cc -g1' on MIPS machines. + + * Internal improvements + +GDB's internal interfaces have been improved to make it easier to support +debugging of multiple languages in the future. + +GDB now uses a common structure for symbol information internally. +Minimal symbols (derived from linkage symbols in object files), partial +symbols (from a quick scan of debug information), and full symbols +contain a common subset of information, making it easier to write +shared code that handles any of them. + + * New command line options + +We now accept --silent as an alias for --quiet. + + * Mmalloc licensing + +The memory-mapped-malloc library is now licensed under the GNU Library +General Public License. + +*** Changes in GDB-4.7: + + * Host/native/target split + +GDB has had some major internal surgery to untangle the support for +hosts and remote targets. Now, when you configure GDB for a remote +target, it will no longer load in all of the support for debugging +local programs on the host. When fully completed and tested, this will +ensure that arbitrary host/target combinations are possible. + +The primary conceptual shift is to separate the non-portable code in +GDB into three categories. Host specific code is required any time GDB +is compiled on that host, regardless of the target. Target specific +code relates to the peculiarities of the target, but can be compiled on +any host. Native specific code is everything else: it can only be +built when the host and target are the same system. Child process +handling and core file support are two common `native' examples. + +GDB's use of /proc for controlling Unix child processes is now cleaner. +It has been split out into a single module under the `target_ops' vector, +plus two native-dependent functions for each system that uses /proc. + + * New hosts supported + +HP/Apollo 68k (under the BSD domain) m68k-apollo-bsd or apollo68bsd +386 CPUs running various BSD ports i386-unknown-bsd or 386bsd +386 CPUs running SCO Unix i386-unknown-scosysv322 or i386sco + + * New targets supported + +Fujitsu SPARClite sparclite-fujitsu-none or sparclite +68030 and CPU32 m68030-*-*, m68332-*-* + + * New native hosts supported + +386 CPUs running various BSD ports i386-unknown-bsd or 386bsd + (386bsd is not well tested yet) +386 CPUs running SCO Unix i386-unknown-scosysv322 or sco + + * New file formats supported + +BFD now supports COFF files for the Zilog Z8000 microprocessor. It +supports reading of `a.out.adobe' object files, which are an a.out +format extended with minimal information about multiple sections. + + * New commands + +`show copying' is the same as the old `info copying'. +`show warranty' is the same as `info warrantee'. +These were renamed for consistency. The old commands continue to work. + +`info handle' is a new alias for `info signals'. + +You can now define pre-command hooks, which attach arbitrary command +scripts to any command. The commands in the hook will be executed +prior to the user's command. You can also create a hook which will be +executed whenever the program stops. See gdb.texinfo. + + * C++ improvements + +We now deal with Cfront style name mangling, and can even extract type +info from mangled symbols. GDB can automatically figure out which +symbol mangling style your C++ compiler uses. + +Calling of methods and virtual functions has been improved as well. + + * Major bug fixes + +The crash that occured when debugging Sun Ansi-C compiled binaries is +fixed. This was due to mishandling of the extra N_SO stabs output +by the compiler. + +We also finally got Ultrix 4.2 running in house, and fixed core file +support, with help from a dozen people on the net. + +John M. Farrell discovered that the reason that single-stepping was so +slow on all of the Mips based platforms (primarily SGI and DEC) was +that we were trying to demangle and lookup a symbol used for internal +purposes on every instruction that was being stepped through. Changing +the name of that symbol so that it couldn't be mistaken for a C++ +mangled symbol sped things up a great deal. + +Rich Pixley sped up symbol lookups in general by getting much smarter +about when C++ symbol mangling is necessary. This should make symbol +completion (TAB on the command line) much faster. It's not as fast as +we'd like, but it's significantly faster than gdb-4.6. + + * AMD 29k support + +A new user controllable variable 'call_scratch_address' can +specify the location of a scratch area to be used when GDB +calls a function in the target. This is necessary because the +usual method of putting the scratch area on the stack does not work +in systems that have separate instruction and data spaces. + +We integrated changes to support the 29k UDI (Universal Debugger +Interface), but discovered at the last minute that we didn't have all +of the appropriate copyright paperwork. We are working with AMD to +resolve this, and hope to have it available soon. + + * Remote interfaces + +We have sped up the remote serial line protocol, especially for targets +with lots of registers. It now supports a new `expedited status' ('T') +message which can be used in place of the existing 'S' status message. +This allows the remote stub to send only the registers that GDB +needs to make a quick decision about single-stepping or conditional +breakpoints, eliminating the need to fetch the entire register set for +each instruction being stepped through. + +The GDB remote serial protocol now implements a write-through cache for +registers, only re-reading the registers if the target has run. + +There is also a new remote serial stub for SPARC processors. You can +find it in gdb-4.7/gdb/sparc-stub.c. This was written to support the +Fujitsu SPARClite processor, but will run on any stand-alone SPARC +processor with a serial port. + + * Configuration + +Configure.in files have become much easier to read and modify. A new +`table driven' format makes it more obvious what configurations are +supported, and what files each one uses. + + * Library changes + +There is a new opcodes library which will eventually contain all of the +disassembly routines and opcode tables. At present, it only contains +Sparc and Z8000 routines. This will allow the assembler, debugger, and +disassembler (binutils/objdump) to share these routines. + +The libiberty library is now copylefted under the GNU Library General +Public License. This allows more liberal use, and was done so libg++ +can use it. This makes no difference to GDB, since the Library License +grants all the rights from the General Public License. + + * Documentation + +The file gdb-4.7/gdb/doc/stabs.texinfo is a (relatively) complete +reference to the stabs symbol info used by the debugger. It is (as far +as we know) the only published document on this fascinating topic. We +encourage you to read it, compare it to the stabs information on your +system, and send improvements on the document in general (to +bug-gdb@prep.ai.mit.edu). + +And, of course, many bugs have been fixed. + + +*** Changes in GDB-4.6: + + * Better support for C++ function names + +GDB now accepts as input the "demangled form" of C++ overloaded function +names and member function names, and can do command completion on such names +(using TAB, TAB-TAB, and ESC-?). The names have to be quoted with a pair of +single quotes. Examples are 'func (int, long)' and 'obj::operator==(obj&)'. +Make use of command completion, it is your friend. + +GDB also now accepts a variety of C++ mangled symbol formats. They are +the GNU g++ style, the Cfront (ARM) style, and the Lucid (lcc) style. +You can tell GDB which format to use by doing a 'set demangle-style {gnu, +lucid, cfront, auto}'. 'gnu' is the default. Do a 'set demangle-style foo' +for the list of formats. + + * G++ symbol mangling problem + +Recent versions of gcc have a bug in how they emit debugging information for +C++ methods (when using dbx-style stabs). The file 'gcc.patch' (in this +directory) can be applied to gcc to fix the problem. Alternatively, if you +can't fix gcc, you can #define GCC_MANGLE_BUG when compling gdb/symtab.c. The +usual symptom is difficulty with setting breakpoints on methods. GDB complains +about the method being non-existent. (We believe that version 2.2.2 of GCC has +this problem.) + + * New 'maintenance' command + +All of the commands related to hacking GDB internals have been moved out of +the main command set, and now live behind the 'maintenance' command. This +can also be abbreviated as 'mt'. The following changes were made: + + dump-me -> maintenance dump-me + info all-breakpoints -> maintenance info breakpoints + printmsyms -> maintenance print msyms + printobjfiles -> maintenance print objfiles + printpsyms -> maintenance print psymbols + printsyms -> maintenance print symbols + +The following commands are new: + + maintenance demangle Call internal GDB demangler routine to + demangle a C++ link name and prints the result. + maintenance print type Print a type chain for a given symbol + + * Change to .gdbinit file processing + +We now read the $HOME/.gdbinit file before processing the argv arguments +(e.g. reading symbol files or core files). This allows global parameters to +be set, which will apply during the symbol reading. The ./.gdbinit is still +read after argv processing. + + * New hosts supported + +Solaris-2.0 !!! sparc-sun-solaris2 or sun4sol2 + +Linux support i386-unknown-linux or linux + +We are also including code to support the HP/PA running BSD and HPUX. This +is almost guaranteed not to work, as we didn't have time to test or build it +for this release. We are including it so that the more adventurous (or +masochistic) of you can play with it. We also had major problems with the +fact that the compiler that we got from HP doesn't support the -g option. +It costs extra. + + * New targets supported + +Hitachi H8/300 h8300-hitachi-hms or h8300hms + + * More smarts about finding #include files + +GDB now remembers the compilation directory for all include files, and for +all files from which C is generated (like yacc and lex sources). This +greatly improves GDB's ability to find yacc/lex sources, and include files, +especially if you are debugging your program from a directory different from +the one that contains your sources. + +We also fixed a bug which caused difficulty with listing and setting +breakpoints in include files which contain C code. (In the past, you had to +try twice in order to list an include file that you hadn't looked at before.) + + * Interesting infernals change + +GDB now deals with arbitrary numbers of sections, where the symbols for each +section must be relocated relative to that section's landing place in the +target's address space. This work was needed to support ELF with embedded +stabs used by Solaris-2.0. + + * Bug fixes (of course!) + +There have been loads of fixes for the following things: + mips, rs6000, 29k/udi, m68k, g++, type handling, elf/dwarf, m88k, + i960, stabs, DOS(GO32), procfs, etc... + +See the ChangeLog for details. + +*** Changes in GDB-4.5: + + * New machines supported (host and target) + +IBM RS6000 running AIX rs6000-ibm-aix or rs6000 + +SGI Irix-4.x mips-sgi-irix4 or iris4 + + * New malloc package + +GDB now uses a new memory manager called mmalloc, based on gmalloc. +Mmalloc is capable of handling mutiple heaps of memory. It is also +capable of saving a heap to a file, and then mapping it back in later. +This can be used to greatly speedup the startup of GDB by using a +pre-parsed symbol table which lives in a mmalloc managed heap. For +more details, please read mmalloc/mmalloc.texi. + + * info proc + +The 'info proc' command (SVR4 only) has been enhanced quite a bit. See +'help info proc' for details. + + * MIPS ecoff symbol table format + +The code that reads MIPS symbol table format is now supported on all hosts. +Thanks to MIPS for releasing the sym.h and symconst.h files to make this +possible. + + * File name changes for MS-DOS + +Many files in the config directories have been renamed to make it easier to +support GDB on MS-DOSe systems (which have very restrictive file name +conventions :-( ). MS-DOSe host support (under DJ Delorie's GO32 +environment) is close to working but has some remaining problems. Note +that debugging of DOS programs is not supported, due to limitations +in the ``operating system'', but it can be used to host cross-debugging. + + * Cross byte order fixes + +Many fixes have been made to support cross debugging of Sparc and MIPS +targets from hosts whose byte order differs. + + * New -mapped and -readnow options + +If memory-mapped files are available on your system through the 'mmap' +system call, you can use the -mapped option on the `file' or +`symbol-file' commands to cause GDB to write the symbols from your +program into a reusable file. If the program you are debugging is +called `/path/fred', the mapped symbol file will be `./fred.syms'. +Future GDB debugging sessions will notice the presence of this file, +and will quickly map in symbol information from it, rather than reading +the symbol table from the executable program. Using the '-mapped' +option in a GDB `file' or `symbol-file' command has the same effect as +starting GDB with the '-mapped' command-line option. + +You can cause GDB to read the entire symbol table immediately by using +the '-readnow' option with any of the commands that load symbol table +information (or on the GDB command line). This makes the command +slower, but makes future operations faster. + +The -mapped and -readnow options are typically combined in order to +build a `fred.syms' file that contains complete symbol information. +A simple GDB invocation to do nothing but build a `.syms' file for future +use is: + + gdb -batch -nx -mapped -readnow programname + +The `.syms' file is specific to the host machine on which GDB is run. +It holds an exact image of GDB's internal symbol table. It cannot be +shared across multiple host platforms. + + * longjmp() handling + +GDB is now capable of stepping and nexting over longjmp(), _longjmp(), and +siglongjmp() without losing control. This feature has not yet been ported to +all systems. It currently works on many 386 platforms, all MIPS-based +platforms (SGI, DECstation, etc), and Sun3/4. + + * Solaris 2.0 + +Preliminary work has been put in to support the new Solaris OS from Sun. At +this time, it can control and debug processes, but it is not capable of +reading symbols. + + * Bug fixes + +As always, many many bug fixes. The major areas were with g++, and mipsread. +People using the MIPS-based platforms should experience fewer mysterious +crashes and trashed symbol tables. + +*** Changes in GDB-4.4: + + * New machines supported (host and target) + +SCO Unix on i386 IBM PC clones i386-sco-sysv or i386sco + (except core files) +BSD Reno on Vax vax-dec-bsd +Ultrix on Vax vax-dec-ultrix + + * New machines supported (target) + +AMD 29000 embedded, using EBMON a29k-none-none + + * C++ support + +GDB continues to improve its handling of C++. `References' work better. +The demangler has also been improved, and now deals with symbols mangled as +per the Annotated C++ Reference Guide. + +GDB also now handles `stabs' symbol information embedded in MIPS +`ecoff' symbol tables. Since the ecoff format was not easily +extensible to handle new languages such as C++, this appeared to be a +good way to put C++ debugging info into MIPS binaries. This option +will be supported in the GNU C compiler, version 2, when it is +released. + + * New features for SVR4 + +GDB now handles SVR4 shared libraries, in the same fashion as SunOS +shared libraries. Debugging dynamically linked programs should present +only minor differences from debugging statically linked programs. + +The `info proc' command will print out information about any process +on an SVR4 system (including the one you are debugging). At the moment, +it prints the address mappings of the process. + +If you bring up GDB on another SVR4 system, please send mail to +bug-gdb@prep.ai.mit.edu to let us know what changes were reqired (if any). + + * Better dynamic linking support in SunOS + +Reading symbols from shared libraries which contain debugging symbols +now works properly. However, there remain issues such as automatic +skipping of `transfer vector' code during function calls, which +make it harder to debug code in a shared library, than to debug the +same code linked statically. + + * New Getopt + +GDB is now using the latest `getopt' routines from the FSF. This +version accepts the -- prefix for options with long names. GDB will +continue to accept the old forms (-option and +option) as well. +Various single letter abbreviations for options have been explicity +added to the option table so that they won't get overshadowed in the +future by other options that begin with the same letter. + + * Bugs fixed + +The `cleanup_undefined_types' bug that many of you noticed has been squashed. +Many assorted bugs have been handled. Many more remain to be handled. +See the various ChangeLog files (primarily in gdb and bfd) for details. + + +*** Changes in GDB-4.3: + + * New machines supported (host and target) + +Amiga 3000 running Amix m68k-cbm-svr4 or amix +NCR 3000 386 running SVR4 i386-ncr-svr4 or ncr3000 +Motorola Delta 88000 running Sys V m88k-motorola-sysv or delta88 + + * Almost SCO Unix support + +We had hoped to support: +SCO Unix on i386 IBM PC clones i386-sco-sysv or i386sco +(except for core file support), but we discovered very late in the release +that it has problems with process groups that render gdb unusable. Sorry +about that. I encourage people to fix it and post the fixes. + + * Preliminary ELF and DWARF support + +GDB can read ELF object files on System V Release 4, and can handle +debugging records for C, in DWARF format, in ELF files. This support +is preliminary. If you bring up GDB on another SVR4 system, please +send mail to bug-gdb@prep.ai.mit.edu to let us know what changes were +reqired (if any). + + * New Readline + +GDB now uses the latest `readline' library. One user-visible change +is that two tabs will list possible command completions, which previously +required typing M-? (meta-question mark, or ESC ?). + + * Bugs fixed + +The `stepi' bug that many of you noticed has been squashed. +Many bugs in C++ have been handled. Many more remain to be handled. +See the various ChangeLog files (primarily in gdb and bfd) for details. + + * State of the MIPS world (in case you wondered): + +GDB can understand the symbol tables emitted by the compilers +supplied by most vendors of MIPS-based machines, including DEC. These +symbol tables are in a format that essentially nobody else uses. + +Some versions of gcc come with an assembler post-processor called +mips-tfile. This program is required if you want to do source-level +debugging of gcc-compiled programs. I believe FSF does not ship +mips-tfile with gcc version 1, but it will eventually come with gcc +version 2. + +Debugging of g++ output remains a problem. g++ version 1.xx does not +really support it at all. (If you're lucky, you should be able to get +line numbers and stack traces to work, but no parameters or local +variables.) With some work it should be possible to improve the +situation somewhat. + +When gcc version 2 is released, you will have somewhat better luck. +However, even then you will get confusing results for inheritance and +methods. + +We will eventually provide full debugging of g++ output on +DECstations. This will probably involve some kind of stabs-in-ecoff +encapulation, but the details have not been worked out yet. + + +*** Changes in GDB-4.2: + + * Improved configuration + +Only one copy of `configure' exists now, and it is not self-modifying. +Porting BFD is simpler. + + * Stepping improved + +The `step' and `next' commands now only stop at the first instruction +of a source line. This prevents the multiple stops that used to occur +in switch statements, for-loops, etc. `Step' continues to stop if a +function that has debugging information is called within the line. + + * Bug fixing + +Lots of small bugs fixed. More remain. + + * New host supported (not target) + +Intel 386 PC clone running Mach i386-none-mach + + +*** Changes in GDB-4.1: + + * Multiple source language support + +GDB now has internal scaffolding to handle several source languages. +It determines the type of each source file from its filename extension, +and will switch expression parsing and number formatting to match the +language of the function in the currently selected stack frame. +You can also specifically set the language to be used, with +`set language c' or `set language modula-2'. + + * GDB and Modula-2 + +GDB now has preliminary support for the GNU Modula-2 compiler, +currently under development at the State University of New York at +Buffalo. Development of both GDB and the GNU Modula-2 compiler will +continue through the fall of 1991 and into 1992. + +Other Modula-2 compilers are currently not supported, and attempting to +debug programs compiled with them will likely result in an error as the +symbol table is read. Feel free to work on it, though! + +There are hooks in GDB for strict type checking and range checking, +in the `Modula-2 philosophy', but they do not currently work. + + * set write on/off + +GDB can now write to executable and core files (e.g. patch +a variable's value). You must turn this switch on, specify +the file ("exec foo" or "core foo"), *then* modify it, e.g. +by assigning a new value to a variable. Modifications take +effect immediately. + + * Automatic SunOS shared library reading + +When you run your program, GDB automatically determines where its +shared libraries (if any) have been loaded, and reads their symbols. +The `share' command is no longer needed. This also works when +examining core files. + + * set listsize + +You can specify the number of lines that the `list' command shows. +The default is 10. + + * New machines supported (host and target) + +SGI Iris (MIPS) running Irix V3: mips-sgi-irix or iris +Sony NEWS (68K) running NEWSOS 3.x: m68k-sony-sysv or news +Ultracomputer (29K) running Sym1: a29k-nyu-sym1 or ultra3 + + * New hosts supported (not targets) + +IBM RT/PC: romp-ibm-aix or rtpc + + * New targets supported (not hosts) + +AMD 29000 embedded with COFF a29k-none-coff +AMD 29000 embedded with a.out a29k-none-aout +Ultracomputer remote kernel debug a29k-nyu-kern + + * New remote interfaces + +AMD 29000 Adapt +AMD 29000 Minimon + + +*** Changes in GDB-4.0: + + * New Facilities + +Wide output is wrapped at good places to make the output more readable. + +Gdb now supports cross-debugging from a host machine of one type to a +target machine of another type. Communication with the target system +is over serial lines. The ``target'' command handles connecting to the +remote system; the ``load'' command will download a program into the +remote system. Serial stubs for the m68k and i386 are provided. Gdb +also supports debugging of realtime processes running under VxWorks, +using SunRPC Remote Procedure Calls over TCP/IP to talk to a debugger +stub on the target system. + +New CPUs supported include the AMD 29000 and Intel 960. + +GDB now reads object files and symbol tables via a ``binary file'' +library, which allows a single copy of GDB to debug programs of multiple +object file types such as a.out and coff. + +There is now a GDB reference card in "doc/refcard.tex". (Make targets +refcard.dvi and refcard.ps are available to format it). + + + * Control-Variable user interface simplified + +All variables that control the operation of the debugger can be set +by the ``set'' command, and displayed by the ``show'' command. + +For example, ``set prompt new-gdb=>'' will change your prompt to new-gdb=>. +``Show prompt'' produces the response: +Gdb's prompt is new-gdb=>. + +What follows are the NEW set commands. The command ``help set'' will +print a complete list of old and new set commands. ``help set FOO'' +will give a longer description of the variable FOO. ``show'' will show +all of the variable descriptions and their current settings. + +confirm on/off: Enables warning questions for operations that are + hard to recover from, e.g. rerunning the program while + it is already running. Default is ON. + +editing on/off: Enables EMACS style command line editing + of input. Previous lines can be recalled with + control-P, the current line can be edited with control-B, + you can search for commands with control-R, etc. + Default is ON. + +history filename NAME: NAME is where the gdb command history + will be stored. The default is .gdb_history, + or the value of the environment variable + GDBHISTFILE. + +history size N: The size, in commands, of the command history. The + default is 256, or the value of the environment variable + HISTSIZE. + +history save on/off: If this value is set to ON, the history file will + be saved after exiting gdb. If set to OFF, the + file will not be saved. The default is OFF. + +history expansion on/off: If this value is set to ON, then csh-like + history expansion will be performed on + command line input. The default is OFF. + +radix N: Sets the default radix for input and output. It can be set + to 8, 10, or 16. Note that the argument to "radix" is interpreted + in the current radix, so "set radix 10" is always a no-op. + +height N: This integer value is the number of lines on a page. Default + is 24, the current `stty rows'' setting, or the ``li#'' + setting from the termcap entry matching the environment + variable TERM. + +width N: This integer value is the number of characters on a line. + Default is 80, the current `stty cols'' setting, or the ``co#'' + setting from the termcap entry matching the environment + variable TERM. + +Note: ``set screensize'' is obsolete. Use ``set height'' and +``set width'' instead. + +print address on/off: Print memory addresses in various command displays, + such as stack traces and structure values. Gdb looks + more ``symbolic'' if you turn this off; it looks more + ``machine level'' with it on. Default is ON. + +print array on/off: Prettyprint arrays. New convenient format! Default + is OFF. + +print demangle on/off: Print C++ symbols in "source" form if on, + "raw" form if off. + +print asm-demangle on/off: Same, for assembler level printouts + like instructions. + +print vtbl on/off: Prettyprint C++ virtual function tables. Default is OFF. + + + * Support for Epoch Environment. + +The epoch environment is a version of Emacs v18 with windowing. One +new command, ``inspect'', is identical to ``print'', except that if you +are running in the epoch environment, the value is printed in its own +window. + + + * Support for Shared Libraries + +GDB can now debug programs and core files that use SunOS shared libraries. +Symbols from a shared library cannot be referenced +before the shared library has been linked with the program (this +happens after you type ``run'' and before the function main() is entered). +At any time after this linking (including when examining core files +from dynamically linked programs), gdb reads the symbols from each +shared library when you type the ``sharedlibrary'' command. +It can be abbreviated ``share''. + +sharedlibrary REGEXP: Load shared object library symbols for files + matching a unix regular expression. No argument + indicates to load symbols for all shared libraries. + +info sharedlibrary: Status of loaded shared libraries. + + + * Watchpoints + +A watchpoint stops execution of a program whenever the value of an +expression changes. Checking for this slows down execution +tremendously whenever you are in the scope of the expression, but is +quite useful for catching tough ``bit-spreader'' or pointer misuse +problems. Some machines such as the 386 have hardware for doing this +more quickly, and future versions of gdb will use this hardware. + +watch EXP: Set a watchpoint (breakpoint) for an expression. + +info watchpoints: Information about your watchpoints. + +delete N: Deletes watchpoint number N (same as breakpoints). +disable N: Temporarily turns off watchpoint number N (same as breakpoints). +enable N: Re-enables watchpoint number N (same as breakpoints). + + + * C++ multiple inheritance + +When used with a GCC version 2 compiler, GDB supports multiple inheritance +for C++ programs. + + * C++ exception handling + +Gdb now supports limited C++ exception handling. Besides the existing +ability to breakpoint on an exception handler, gdb can breakpoint on +the raising of an exception (before the stack is peeled back to the +handler's context). + +catch FOO: If there is a FOO exception handler in the dynamic scope, + set a breakpoint to catch exceptions which may be raised there. + Multiple exceptions (``catch foo bar baz'') may be caught. + +info catch: Lists all exceptions which may be caught in the + current stack frame. + + + * Minor command changes + +The command ``call func (arg, arg, ...)'' now acts like the print +command, except it does not print or save a value if the function's result +is void. This is similar to dbx usage. + +The ``up'' and ``down'' commands now always print the frame they end up +at; ``up-silently'' and `down-silently'' can be used in scripts to change +frames without printing. + + * New directory command + +'dir' now adds directories to the FRONT of the source search path. +The path starts off empty. Source files that contain debug information +about the directory in which they were compiled can be found even +with an empty path; Sun CC and GCC include this information. If GDB can't +find your source file in the current directory, type "dir .". + + * Configuring GDB for compilation + +For normal use, type ``./configure host''. See README or gdb.texinfo +for more details. + +GDB now handles cross debugging. If you are remotely debugging between +two different machines, type ``./configure host -target=targ''. +Host is the machine where GDB will run; targ is the machine +where the program that you are debugging will run. |