Debugging with GDB Manual
Page
 Table of Contents
 Print settings Value history
Continuing and stepping Signals
Breakpoints
Stack frames
 Examining the Symbol Table
 Specifying a Debugging Target
 Scramble previous memory contents at malloc/free calls
Stop when freeing unallocated or deallocated blocks
Batch Mode
Commands for heap profiling
 Support for the dumpcore command
Support for the info target Command
Enhancements to the dumpcore command
Example Illustrating Execution Path Recovery
 Support for steplast command for C and C++
Command for evaluating the address of an expression
Debugging the application using GDB under Aries
Detecting memory leaks using GDB under Aries
 HP-UX Terminal User Interface
 Setting Command History Feature in GDB 281 17.4
Miscellaneous commands 265 16.3
User-defined commands 287 18.2
Command files 289 Commands for controlled output 290
 22.2 How to report bugs 361
20.7 Errors 302 20.8
20.9 Invalidation notices 303
304
 List of Tables
 List of Examples
 Summary of GDB
Free Software
Contributors to GDB
Page
 Contributors to GDB
Page
 Let us use GDB to try to see what is going on
Sample GDB Session
Loading the Executable
 Setting Breakpoints
Setting Display width
Here we describe how to set a breakpoint
Running the executable under GDB
 Stepping into a subroutine
Examining the Stack
Printing Variable Values
 Listing Source Code
Setting Variable Values During a Session
 Gdb c Continuing Definebaz,defnQUOTEfooUNQUOTE Baz
Page
 Invoking GDB
Getting In and Out of GDB
 Files
Choosing files
 Choosing modes
Processed. See Command files
 Line number in a standard, recognizable fashion each
GNU Emacs sets this option when it runs GDB as a
Time a stack frame is displayed which includes each
Like two `\032 characters, followed by the file name
 Emacs
 Quitting GDB
Redirecting WDB input and output to a file
Interface
 Shell commands
Page
 GDB Commands
Command syntax
Command completion
 GDB sounds bell press TAB again, to see
 Short list of named classes of commands
Getting help
Help , h
 Results
Apropos reload
Complete
This is intended for use by GNU Emacs
 Getting help
Page
 Compiling for debugging
Running Programs Under GDB
Starting your program
Arguments, so that you may use normal
 See Arguments To Your Program
Your program. SeeProgram Environment
Directory
 Arguments To Your Program
Program Environment
Program. See Program Input and Output
 Display the list of search paths for executables
For example, this command
Path environment variable
Do not supply varname, print the names
 Program Input and Output
Working directory
 Debugging a Running Process
 Killing the child process
 Debugging programs with multiple threads
 New process 35 thread
 Thread apply command allows you to
Here are commands to get more information about threads
With the command argument threadno
Display a summary of all threads currently
 Debugging programs with multiple processes
 Unimpeded. This is the default
New process. The mode can be
Set the debugger response to a program call
Fork. The child process runs
 Breakpoints
Stopping and Continuing
 Setting breakpoints
 Breakpoints
See Break conditions page 59, for more
 Catchpoint
Breakpoint
Whether
Breakpoint is
 Enabled
When hit
Marked to be
Breakpoints are
 Setting catchpoints
 Is currently only available for HP-UX
Call to vfork. This is currently only
Unloading of any dynamically loaded
Shared library, or the unloading
 Deleting breakpoints
Disabling breakpoints
Selecting a frame page 73 . When
 Break conditions
 No symbol foo in current context
Breakpoint, GDB prints an error message
Stops your program only if the value
Use condition, GDB checks expression
 Breakpoint command lists
 Breakpoint menus
 Cannot insert breakpoints
 Conditions
Continuing and stepping
 Function
 Setting breakpoints page 52. This form of the command
 Stops. See Automatic display
Signals
 Info handle is an alias for info signals
 Stopping and starting multi-thread programs
 Stopping and Continuing
 Stack frames
Examining the Stack
 Commands for Examining the Stack
Stacks Without frames
Backtraces
 Selecting a frame
 When used without any argument, this command does not
Have existed longer. n defaults to one
With an argument, this command is used to select a stack
Information about a frame
 Setting catchpoints
Page
 Printing source lines
Examining Source Files
List
Show listsize
 Searching source files
 Specifying source directories
 Source and machine code
Show directories
Contains
 Disassemble or x/i commands
Set disassembly-flavor
Select the instruction set to use when
Disassembling the program via
Page
 Examining Data
Following forms of print command are supported
Expressions
To See Artificial arrays page 85, for more information
 Program variables
Where it is defined. See Program variables
Type addr
Normally supposed to reside at addr
 Artificial arrays
You can print the contents of array with
 Output formats
 Examining memory
Machine instruction. The default is
Print, s null-terminated string, or
Time you use either x or print
 However, the count n must come first wx4 does not work
 For fmt specifying only a display format and not a size or
Automatic display
See Output formats
For fmt i or s, or including a unit-size or a number
 Print settings
 File name and line number of a symbol
A symbol. This is the default
Symbolic form of an address
Address
 Strings. When GDB starts, this limit is set to
Default is off
Setting number-of-elementsto zero
Short strings. The default is off
 Show which format GDB is using to print
This is the default format
Print using only seven-bit characters if this
Default
 Default is on
These settings are of interest when debugging C++ programs
Show whether C++ names in assembly listings
Would print
 Value history
 Convenience variables
 Format in which the data was printed
Command, in which case it is a pointer to the type of $
$exitcode
Program being debugged terminates
 Info registers Info all-registers Info registers regname
Registers
Or print the instruction to be executed next with
Or add four to the stack pointer3 with3with
 Floating point hardware
Printing Floating Point Values
To get the bit pattern, try the following macro
This is what the macro produces
 100
 Switching between source languages
Using GDB with Different Languages
List of filename extensions and languages
Cpp
 Not skip over function prologues when stepping
Setting the working language
Having GDB infer the source language
Files
 Displaying the language
Type and range checking
An overview of type checking
 An overview of range checking
 Supported languages
 C++
 Non-zero for true
Expressions is 0 for false and non-zero for true
Left shift, and right shift. Defined on integral types
Types and pointer types
 Double colons also represent the GDB scope operator see
Class types
Expressions page 83. Same precedence as , above
C++ constants
 GDB expression handling can interpret most C++ expressions
1.3 C++ expressions
 C++ defaults
Printing the variable or class returns
C++ type and range checks
 GDB and C
GDB features for C++
Breakpoint menus
See Breakpoint menus
 Fortran
Fortran types
Fortran types supported
 Less than or equal to
Less than
Greater than
Greater than or equal to
 Fortran special issues
Commonblockname
Block
 Examining the Symbol Table
 As with whatis, using ptype without an
Two commands give this output
Symbols will be read when needed
For example, for this variable declaration
 Replace symbol definitions
Allow GDB to reload the symbols for
Do not replace symbol
Once. This is the default
 Is in another source file. The default is on
Setting
Tell GDB to resolve opaque types. An opaque
Class, or union―for example, struct
 Assignment to variables
Altering Execution
 Stores the value 4 into that memory location
Continuing at a different address
 Giving your program a signal
You can use the following command to return from a function
Returning from a function
 Patching programs
Calling program functions
Return , return
Is used as the return value from the function value
 Patching programs
 124
 GDB Files
Commands to specify files
 See Optional warnings and messages
 GDB has the entire symbol table available
Option with any of the commands that load
Write the symbols for your program into a
Map in symbol information from this auxiliary
 Section
 To display or set the threshold, use the commands
Symbols were loaded. Both the commands list
If threshold is nonzero, symbols from all
New library has been loaded, until the symbol
 Searching the default system directories
Names where the desired shared libraries reside. GDB
Specifying shared library locations
Megabytes
 Errors reading symbol files
Verbose on. See Optional warnings
Messages
 Is the symbol type of the uncomprehended
Symbol scope block as starting on the previous
GDB circumvents the error by ignoring this
Debug your program, though certain symbols
 Commands for managing targets
Specifying a Debugging Target
Active targets
 See Commands to specify files
 Choosing target byte order
 Instruct GDB to assume the target is little-endian
Instruct GDB to assume the target is big-endian
Executable
Display GDBs current idea of the target byte order
 Summary of HP Enhancements to GDB
HP-UX Configuration-Specific Information
 Support for setting breakpoints using shared library name
Implementation of ask mode for set follow-fork-mode
 Command watchtarget
 HP-UX dependencies
Linker Dependencies
Dependent Standard Library Routines for Run Time Checking
 Getpid Close Srand Strchr
Abort Unlink Atoi
 Supported Platforms and Modes
 Support for Alternate root
HP-UX targets
WDB Location
GDB location
 Librtc.sl location $WDBROOT/bin Opt/langtools/ n/a
Specifying object file directories
None
Bin $WDBROOT/bin
 Fix and continue debugging
 Fix and Continue restrictions
Fix and Continue compiler dependencies
 Using Fix and Continue
 Example Fix and Continue session
Compile the program
Run the program
 Gdb run
Gdb b main
Gdb edit
Make the necessary changes. In this case, add return total
 Inline Support
Inline Debugging in HP 9000 Systems
Gdb q
 Following options available for the set inline-debugcommand
Breakpoint info frame disassembly
Inline Debugging in Integrity Systems
Step next list backtrace frame n info locals info args
 Debugging Inline Functions in Integrity Systems
Limitations
 Info frame disassembly
Debugging Macros
Viewing and Evaluating Macro Definitions
 Compiler Options to Enable Macro Debugging
Evaluating Macros
Debug=none
 Examples for Macro Debugging
 HP-UX Configuration-Specific Information
 Debugging Memory Problems
 When to suspect a memory leak
Memory debugging restrictions
Memory Debugging Methodologies
 Debugging Memory in Interactive Mode
 This command are ignored from report. If
Displays all current settings for memory
Heap growth. The default value is 100. Every
Command discards the data existing in the file
 Debugging Memory Problems
 Have occurred and WDB reports the problem
Debugging when the string option is set for
Specific pattern when it is allocated or
Such as attempting to access space that is freed
 If the user specifies a value less than 16 for
Use the info command to show list of memory leaks
Number of bytes, the debugger ignores it
User-specified value
 Debugging Memory in Batch Mode
Setting Configuration Options for Batch Mode
Gdb info leak
 Sets the number of frames to be printed for leak context
Framecount=noframes or set heap-check frame-count noframes
 For 64 bit IPF applications
For 32 bit IPF applications
For 64 bit PA applications
For 64-bit IPF applications
 Ldpreload
Environment variable setting for Batch mode debugging
 Aborts execution when out of memory
Aborts execution when heap objects
Log file for batch mode must be
Stderr error message goes to stderr
 Example for Batch Mode RTC
 Complete one of the following steps
 Rtcconfig file should contain entries such as the following
Preload the librtc library as follows
Run the program as follows
 For 32 bit PA applications
 Run the program Start a debugging session as follows
Configuring memory debugging settings
Specifying the stack depth
Specifying minimum leak size
 Scenarios in memory debugging
Stop when freeing unallocated or deallocated blocks
For example, if you use
Specifying minimum block size
 Interactive debugging mode set heap-check scramble on off
Scramble previous memory contents at malloc/free calls
Syntax
Detect dangling pointers and dangling blocks
 Detect in-block corruption of freed blocks
 Off
Memory Debugging Commands in Interactive and Batch Mode
 Point you use the info heap command
Commands for heap profiling
Heap Profiling
As the start of the heap, end of the heap, heap
 Set a breakpoint
This example shows how to use this feature on HP-UX
 Changes for a given run
Commands to track the change in data segment value
 Support for Enabling and Disabling Specific Threads
Thread Debugging Support
 Advanced Thread Debugging Support
Backtrace Support for Thread Debugging
 Pre-requisites for Advanced Thread Debugging
Enabling and Disabling Advanced Thread Debugging Features
 Unlock-not-own onoff The set thread-check unlock-not-own
Onoff command checks if an application
Mixed-sched-policy onoff The set thread-check
Cv-multiple-mxs onoff The set thread-check cv-multiple-mxs
 User and prints a warning message when this
This returns an Einval error to
Command checks if any thread has terminated
Different mutexes. The debugger transfers
 Command checks if a thread has terminated
When this condition is detected. This situation
Exception or a cancel without joining or
Created with the detach attribute. When an
 Is provided, the command displays extended
Provided, the command displays extended
Condvar-id is provided, the command displays
Rwlock-id is provided, the command displays
 For 64-bit PA applications
 Thread Debugging in Batch Mode
 Pre-requisites for Batch mode of Thread Debugging
For 64 bit IPF applications, set
For 64-bit PA applications, set
 Set the environment variable Batchrtc to on as
And/Or
 Opt/langtools/lib/hpux64/librtc.so
 Thread Debugging in +check Mode
Where Pid is the process id
Limitations in Batch mode of thread debugging
 Where pid is the process identifier
Issue
Debugging MPI Programs
 Serial mode for set follow-fork-mode
Ask mode for set follow-fork-mode
Support for showing unwind info
Debugger response to a program call to fork or vfork is ask
 Printing CFM and PFS registers
Command to Search for a Pattern in the Memory Address Space
 Specifies the length of the memory address range. This
Parameter is mandatory when end-addressis not
String value. The character pattern must be enclosed
Within double quotes. This parameter is mandatory
 Example 14-1 Sample Output for the find command
 Using the /size-charparameter
Using the /max-countparameter
Str0 Specifies the starting address
Specifies the pattern expr1
 Generating core files with packcore /unpackcore/getcore
Debugging Core Files
 Support for the info target Command
 When starting from the HP WDB command line
Support for the dumpcore command
When starting from the shell prompt
Enhancements to the dumpcore command
 Support for display of run time type information
When starting from shell prompt
Info rtti address
Sample Output
 Info exec-path summary
Info global-exec-path summary
Exec-path updownpathindex aliased to ep
 Example Illustrating Execution Path Recovery
Sample Program
Sample Debugging Session
 Command to Unwind Beyond 10000 Frames
 Invoking GDB Before a Program Aborts
Aborting a Command Line Call
 Enhanced support for watchpoints and breakpoints
Instruction Level Stepping
Deferred watchpoints
Hardware watchpoints
 Support for template breakpoints
Support for procedural breakpoints
Rbp
Rdp
 Debugging support for shared libraries
Using shared library as main program
 Setting Deferred Breakpoints in Shared Library
Using catch load
Privately mapping shared libraries
 Opt/langtools/bin/pxdb -s on executable-name
Selectively Mapping Shared Libraries As Private
 Enhancement to the info shared Command
Setting breakpoints in shared library
Debugging support for Decimal Floating Point data type
Printing Decimal Floating point data types
 Printing NaT Registers
Following are sample commands to print NaT registers
Handling Decimal Floating Point Data types
Evaluating Decimal Floating Point data types
 Arithmetic Operations
Assignment of Decimal floating point value to variable
Comparison Operations
Printing type of Decimal Floating Point variable
 Support for Binary Floating Point constants f, l
Additional Support for binary floating point data type
This prints the binary floating point value as oat
This prints the binary floating point value as double
 Java Stack Unwind Features
Language support
Enhanced Java Debugging Support
 Gdb help java
Gdb Subcommands for Java VM Debugging
 Java and native stack frames
Frame command of GDB has been enhanced to interpret a Java
Info frame
Stack frame
 Java corefile debugging support
Java attach mode debugging support
 Syntax
Enhanced support for C++ templates
 Support for fpreg data type on IPF
Support for Complex variables in HP C
Support for debugging namespaces
 Command for evaluating the address of an expression
Viewing Wide Character Strings
This is equivalent to executing
 Support for dumping array in an Ascii file
Support for output logging
 Support for Fortran array slices
Support for steplast command for C and C++
Displaying enumerators
Support for debugging typedefs
 Getting information from a non-debug executable
 Debugging optimized code
Break Call Clear Disassem List
Break Call Cond Jump Return Print Set var Watch Whatis
 HP-UX Configuration-Specific Information
 Debugging Optimized Code at Various Optimization Levels
14.29.1.1 +O0 and +O1
14.29.1.2 +O2/+O3/+O4/-ipo
 Following limitations apply when debugging optimized code
Debugging with Aries
+O2 or -O
 Limitations of GDB Support under Aries
Debugging the application using GDB under Aries
 Attaching GDB to an already running emulated process
Detecting memory leaks using GDB under Aries
 Starting and stopping Visual Interface for WDB
Visual Interface for WDB
 Visual Interface for WDB GUI display
Navigating the Visual Interface for WDB display
 Specifying foreground and background colors
Using the X-window graphical interface
 Using the TUI mode
Changing the size of the source or debugger pane
For dterm, use the following
 Editing the command line and command-line history
Using commands to browse through source files
Saving the contents of a debugging session to a file
Loading source files
 GNU GDB Logging Commands
Support for XDB commands
Support for command line calls in a stripped executable
Stop in/at dbx commands
 For 32-bit applications
Execute the chatr -B immediate executable command
 Support for debugging stripped binaries
Command line calls to non-stripped library
For 64-bit applications
Printing of locals and globals in a stripped module
 Displaying the current block scope information
Linux support
Syntax
 242
 HP-UX Terminal User Interface
Invoke the debugger using a command like the following
Starting the TUI
Main
 Screen Layouts
Automatically running a program at startup
 Disassembly pane appears when you issue the command
Disassembly pane
Source pane
Pane looks like this
 Source/Disassembly pane
Disassembly/Register pane
Source/Disassembly pane appears when you issue the command
 Source/Register pane
Source/Register pane appears when you issue the command
 Toggle split-screen mode
Use the commands
Cycling through the panes
Changing pane focus
 Fs regs Foc next
 Changing the register display
Scrolling panes
 Changing the pane size
 Refreshing and updating the window
 XDB to WDB Transition Guide
By-function lists of XDB commands and HP WDB equivalents
 Window mode commands
Invocation commands
Invocation commands
Window mode commands
 File viewing commands
File viewing commands
 Data Viewing and modification commands
Source directory mapping commands
 Ll string Lm string
Data viewing and modification commands
 Stack viewing commands
Stack viewing commands
 Job control commands
Status-viewing command
Status viewing commands
Job control commands
 Overall breakpoint commands
Auxiliary breakpoint commands
Overall breakpoint commands
 Breakpoint creation commands
Auxillary breakpoint commands
10 Breakpoint creation commands
 11 Overall breakpoint commands
Breakpoint status commands
 Global breakpoint commands
All-procedures breakpoint commands
12 Global breakpoint commands
Bp bpt bpx dp Dpt Dpx
 Assertion control commands
Record and playback commands
Macro facility commands
 Miscellaneous commands
Signal control commands
13 Macro facility commands
14 Signal control commands
 Format of the print command is different in XDB and GDB
16 Data format commands
XDB data formats and HP WDB equivalents
 Decimal integer
 17 Macro facility commands
XDB location syntax and HP WDB equivalents
XDB special language operators and HP WDB equivalents
 XDB special variables and HP WDB equivalents
18 Special language operators
19 Special variables
 XDB variable identifiers and HP WDB equivalents
Alphabetical lists of XDB commands and HP WDB equivalents
16.8.1 a
20 Variable Identifiers
 22 B
16.8.2 B
 23 C through D
Through D
 16.8.5 L
Through K
24 F through K
25 L
 26 M through P
Through P
 16.8.8 T
Through S
27 Q through S
28 T
 29 U through Z
Through Z
 30 Symbols
Symbols
 Any string
 Control-C # text
 280
 Setting Command Editing Options in GDB
Setting the GDB Prompt
Setting Command History Feature in GDB
Controlling GDB
 To fname. This is the file where GDB reads an
Control the settings
Exits. You can access this list through history
Expansion or through the history command
 Supported Number Formats
Setting the GDB Screen Size
 Optional warnings and messages
 Optional messages about internal happenings
Set confirm on
Show confirm Displays state of confirmation requests
 Object debugging info
Show debug varobj
 User-defined commands
Canned Sequences of Commands
 User-defined command hooks
 To add source directories or
Command files
 Commands for controlled output
 Output formats
Expressions
 292
 Using GDB under gnu Emacs
 Execute to next instruction, using the GDB nexti command
Calls, like the GDB next command. Then update the display
Update display window accordingly
GDB up command
 295
 296
 What is an annotation?
GDB Annotations
Server prefix
 Values
When printing a structure, GDB annotates it as follows
 When printing an array, GDB annotates it as follows
Frames
Frame annotation begins with
 Then comes
 Annotation for GDB input
Displays
 Information on breakpoints
Errors
 Running the program
Invalidation notices
 Displaying source
 Target-invalid
Annotations We Might Want in the Future
 306
 GDB/MI Interface
21.1 GDB/MI Command Syntax
 Done running connected error exit
21.1.2 GDB/MI Output syntax
Pragmatics
 Value Const tuple list String Tuple →
 21.2 GDB/MI compatibility with CLI
Here is what happens if you pass a bad command
Simple examples of GDB/MI interaction
Here is an example to evaluate an expression
 21.3 GDB/MI output records
21.4 GDB/MI command description format
21.3.1 GDB/MI result records
21.3.2 GDB/MI stream records
 -break-after Command
21.5 GDB/MI breakpoint table commands
 Corresponding GDB command is condition
-break-condition command
 -break-disable command
-break-delete command
Corresponding GDB command is delete
Corresponding GDB command is disable
 -break-info Command
-break-enable command
 Result
-break-insert command
 -break-list command
 -break-watch command
Corresponding GDB commands are watch, awatch, and rwatch
Setting a watchpoint on a variable in the main function
 Exec-continue running gdb
 21.6 GDB/MI Data manipulation
-data-disassemble command
 There is no direct mapping from this command to the CLI
Disassemble from the current value of $pc to $pc +
Disassemble 3 instructions from the start of main
 -data-evaluate-expression command
 -data-list-register-names command
-data-list-changed-registers Command
Display a list of the registers that have changed
On a PPC MBX board
 -data-list-register-values command
 -data-read-memory command
Space should be quoted using the C convention
To be read. Complex expressions containing embedded white
 Word-format Word-sizenr-rowsnr-cols aschar
 -display-disable Command
-display-delete command
 -display-insert Command
-display-enable command
-display-list command
-environment-cd command
 -environment-path command
-environment-directory command
 Corresponding GDB command is pwd
-environment-pwd command
21.7 GDB/MI program control
Show the current working directory
 -exec-abort command
-exec-arguments command
-exec-continue command
 -exec-interrupt command
-exec-finish command
Corresponding GDB command is finish
Corresponding GDB command is interrupt
 -exec-next-instruction command
-exec-nextcommand Synopsis
Corresponding GDB command is next
Corresponding GDB command is nexti
 -exec-runcommand Synopsis
-exec-return command
Corresponding GDB command is return
Corresponding GDB command is run
 Example -exec-stepCommand Synopsis
-exec-show-arguments command
 -exec-until command
-exec-step-instruction command
Corresponding GDB command is stepi
Regular stepping
 -file-exec-file command
-file-exec-and-symbols command
Corresponding GDB command is until
Corresponding GDB command is file
 -file-list-exec-sections command
-file-list-exec-source-files command
-file-list-shared-libraries command
 -file-list-symbol-files command
Miscellaneous GDB commands in GDB/MI
-file-symbol-file command
-gdb-exitcommand Synopsis
 -gdb-setcommand Synopsis
-gdb-showcommand Synopsis
-gdb-version command
 21.9 GDB/MI Stack Manipulation Commands
-stack-info-frame command
-stack-info-depth command
 For a stack with frame levels 0 through
-stack-list-arguments command Synopsis
 -stack-list-frames command
 Full stack backtrace
Corresponding GDB commands are backtrace and where
Show frames between lowframe and highframe
Show a single frame
 -stack-list-locals command
-stack-select-frame command
Info locals in GDB, gdbgetlocals in gdbtk
 -symbol-info-address command
21.10 GDB/MI Symbol query commands
-symbol-info-file command
-symbol-info-function command
 -symbol-info-symbol command
-symbol-info-line command
-symbol-list-functions command
-symbol-list-types command
 -symbol-list-variables command
-symbol-locate command
-symbol-type command
 -target-attach command
21.11 GDB/MI Target Manipulation Commands
-target-compare-sections command
-target-detach command
 Corresponding GDB command is load
-target-download command
Name of the section
At the end, a summary is printed
 -target-exec-status command
 -target-list-available-targets command
-target-list-current-targets command
-target-list-parameters command
 -target-select command
21.12 GDB/MI thread commands
-thread-info command
-thread-list-all-threads command
 -thread-select command
-thread-list-ids command
 21.13 GDB/MI tracepoint commands
Tracepoint commands are not yet implemented
21.14 GDB/MI variable objects
 -var-create command
GDB/MI Operations
Description and use of operations on variable objects
 -var-set-format command
-var-delete command
-var-show-format command
-var-info-num-children command
 -var-info-type command
-var-list-children command
-var-info-expression command
-var-show-attributes command
 -var-update command
-var-assign command
 360
 How to report bugs
Reporting Bugs in GDB
Have you found a bug?
 Reporting Bugs in GDB
 How to report bugs
 364
 Installing GDB
 Compiling GDB in another directory
Gdb-gdb-199991101/mmalloc
Package
 Specifying names for hosts and targets
 Separate directories. configure writes configuration
Configure options
To use the source in the directory dirname. configure
Srcdir= dirname
 All available targets
Target=target