DJGPP FAQ

Table of Contents

• DJGPP FAQ List
• 1 If You Are In a Hurry
• 2 What is DJGPP?
• 3 Hardware and Software Requirements
  • 3.1 The minimum system requirements for using DJGPP
  • 3.2 Does it really work under OS/2?
  • 3.3 Will DJGPP work on Windows/NT?
  • 3.4 Can it run under Linux?
  • 3.5 Can I run it on a 286?
  • 3.6 MS-Windows applications and DJGPP
  • 3.7 Machine you would like to buy...
  • 3.8 Machine most of us will actually buy ...
  • 3.9 How to configure your system for DJGPP
  • 3.10 How to get the most RAM for DJGPP programs?
• 4 Where and What to Download?
  • 4.1 Where can DJGPP be found?
  • 4.2 How do I download DJGPP?
  • 4.3 What if I don't know what FTP is?
  • 4.4 What Files to Download?
  • 4.5 How much disk space will I need?
  • 4.6 Can I get away with less megabytes?
  • 4.7 How to uninstall a DJGPP package.
• 5 The DJGPP Documentation
  • 5.1 Where are the documentation files?
  • 5.2 How to read the docs without Info?
  • 5.3 How to print the docs?
  • 5.4 Some docs are nowhere to be found...
  • 5.5 What are these foo.1 files?
  • 5.6 What if the docs don't say enough?
• 6 When the Compiler (or Make, or Info, or ...) Crashes...
  • 6.1 GCC or some other DJGPP programs hang
  • 6.2 GCC says "No DPMI"
  • 6.3 Buggy DPMI host or junk in DJGPP.ENV can crash v2.x programs
  • 6.4 GCC can crash during optimization
  • 6.5 Why does GCC say "cannot exec as"?
  • 6.6 What does "Internal compiler error" mean?
  • 6.7 What does "Unknown filetype" mean?
  • 6.8 Compiler hangs, but only when invoked from Make
  • 6.9 Info doesn't like some files
  • 6.10 Info Crashes During Startup
  • 6.11 Why does Bash crash?
  • 6.12 DJGPP programs crash on a ThinkPad
  • 6.13 Why does the Linker Access my CD Drive or the network?
  • 6.14 Other kinds of trouble
  • 6.15 I cannot keep up with the error messages
  • 6.16 How to search DJGPP archives
  • 6.17 How to ask DJGPP gurus for help
• 7 Compiler and Linker Performance
  • 7.1 Slow Compilation
  • 7.2 Slow Linking
• 8 Compile-time and Link-time Problems
  • 8.1 GCC doesn't find the source files
  • 8.2 GCC can't find headers or libraries
  • 8.3 GCC can't find C++ headers
  • 8.4 GCC barfs on C++-style comments in C programs
  • 8.5 How does GCC recognize the source language?
  • 8.6 Problems with Objective C
  • 8.7 Writing codes fragments which are specific to DJGPP
  • 8.8 Undefined references when linking programs
  • 8.9 How not to lose your head with all these libraries
  • 8.10 DJGPP uses a one-pass linker
  • 8.11 Some functions in C++ programs still not found
  • 8.12 Unresolved djgpp_first_ctor
  • 8.13 C++ programs yield large .exe file
  • 8.14 Why are DJGPP .exe files so large?
  • 8.15 Why don't we use DLLs to make programs smaller?
  • 8.16 Linker fails to produce the EXE program
  • 8.17 Building Allegro or GRX library fails
  • 8.18 C++ compiler says "NULL redefined"
  • 8.19 C++ exceptions support
  • 8.20 How to get GCC to generate assembly code
  • 8.21 What's wrong with sys/movedata.h?
  • 8.22 How do I create a library of object files?
  • 8.23 GCC Cannot find stubify.
• 9 Running Compiled Programs
  • 9.1 My program crashes only in v2.0!
  • 9.2 Programs that crash in malloc or free.
  • 9.3 The call stack traceback
  • 9.4 Reading and writing binary files
  • 9.5 Buffered screen I/O surprises
  • 9.6 What do DJGPP programs need to run?
  • 9.7 How many file handles can DJGPP use?
  • 9.8 DJGPP and Anti-Virus Software
• 10 Writing and Running Graphics Programs
  • 10.1 What GRX driver to use with your SVGA
  • 10.2 Accessing the video memory
  • 10.3 Graphics screen restoring under Windows
  • 10.4 OpenGL and related packages for DJGPP
• 11 Floating Point Issues and FP Emulation
  • 11.1 Floating-point code without 80387
  • 11.2 Floating point inaccuracies when using emulator
  • 11.3 Problems with emulation on Windows
• 12 Debugging DJGPP Programs
  • 12.1 How to run a DJGPP program under debugger
  • 12.2 How to begin debugging using the crash dump info
  • 12.3 How to debug a graphics program
  • 12.4 GDB finds only .cc source
  • 12.5 Can GDB print class members?
  • 12.6 GDB cannot list source that was #include'd
  • 12.7 GDB cannot display or set static uninitialized variables
  • 12.8 Debugging bool data type
  • 12.9 Debugging the complex data type
  • 12.10 Debuggers choke on some programs ...
• 13 Profiling DJGPP Programs
  • 13.1 How to profile a DJGPP program
  • 13.2 Programs compiled with -pg crash when run
  • 13.3 Gprof produces garbled profile
  • 13.4 Why is __dpmi_int so heavily used?
  • 13.5 gprof doesn't produce output
• 14 Run-time Performance of DJGPP Programs
  • 14.1 How efficient is DJGPP-generated code?
  • 14.2 Comparing newer versions with old ones
  • 14.3 DJGPP programs on a Pentium
  • 14.4 I/O speed in DJGPP programs
  • 14.5 My ported program runs much slower!
• 15 Run-Time Memory Issues
  • 15.1 How much virtual memory do you have?
  • 15.2 It seems malloc/free don't affect virtual memory...
  • 15.3 Failure to get more memory than is physically installed
  • 15.4 Memory allocation fails before all memory is used
  • 15.5 Memory allocation fails under Windows
  • 15.6 Memory allocation peculiarities under Windows 9X
  • 15.7 Memory allocation fails under EMM386 or HIMEM
  • 15.8 How much memory do parent DJGPP programs leave for their child?
  • 15.9 How much stack can I have in DJGPP programs?
  • 15.10 Memory-related problems in Windows 98
• 16 Command-line Arguments Handling in DJGPP
  • 16.1 Filename wildcards expansion under DJGPP
  • 16.2 How to disable filename wildcards expansion
  • 16.3 How to pass command-line arguments with quotes or @
  • 16.4 How to pass command lines longer than 126 characters
  • 16.5 What is the maximum length of command line under DJGPP
  • 16.6 Why Make passes only 126 characters to programs?
• 17 Converting DOS Programs/Libraries to DJGPP
  • 17.1 GCC/Gas won't accept valid assembly code ...
  • 17.2 Converting between Intel ASM syntax and AT&T syntax
  • 17.3 Converted code GP Faults!
  • 17.4 Problems with combining assembly and C/C++ modules
  • 17.5 I want to use a .obj or .lib code with DJGPP
  • 17.6 I must use my 16-bit code with DJGPP!!
  • 17.7 What should I do with those "near" and "far" declarations?
  • 17.8 How to convert _AX pseudo-registers?
• 18 Low-level DOS/BIOS and Hardware-oriented Programming
  • 18.1 Got "Unsupported INT 0xNN" calling int86
  • 18.2 How to use buffers with DOS/BIOS services
  • 18.3 How to call real-mode functions
  • 18.4 How to move data between your program and conventional memory
  • 18.5 How to move structs returned by real-mode services?
  • 18.6 Fast access to absolute addresses
  • 18.7 Accessing absolute address above 1MB
  • 18.8 How to make DOS/BIOS call your function
  • 18.9 How to hook hardware interrupts
  • 18.10 Should I use _go32_XXX or __dpmi_YYY functions?
  • 18.11 Hardware interrupt hooking has its subtleties
  • 18.12 Inline Assembly code with GCC
  • 18.13 Using DMA with DJGPP
• 19 Legal Aspects
  • 19.1 Legal (un)restrictions on DJGPP applications
  • 19.2 Legal restrictions of DJGPP utilities and libraries
• 20 Getting Help
  • 20.1 Don't post DJGPP-specific problems to GNU News groups
  • 20.2 How to post to the DJGPP forum
  • 20.3 How to become a subscriber to the mailing list
  • 20.4 How to unsubscribe from the mailing list
  • 20.5 Is it okay to post messages in languages other than English?
• 21 Version 2 vs v1.x
  • 21.1 New features in DJGPP v2
  • 21.2 DJGPP environment in v2.x
  • 21.3 Why are new DJGPP versions released so slowly?
  • 21.4 Where to find the best C library for DJGPP
• 22 Miscellany
  • 22.1 Problems with using RHIDE.
  • 22.2 Unzipping complains about duplicate/invalid files.
  • 22.3 How to change a DJGPP package?
  • 22.4 Where to find DJGPP packages?
  • 22.5 How to create symbolic links to programs
  • 22.6 Where to find the DPMI specification?
  • 22.7 The DJGPP Web site.
  • 22.8 Where to upload your contributions to DJGPP
  • 22.9 DJGPP as cross-compiler
  • 22.10 GCC says "garbage at end of number"
  • 22.11 What should sizeof (struct xyzzy) return?
  • 22.12 C++ doesn't pack structs!
  • 22.13 How to avoid "Abort, Retry, Fail" messages
  • 22.14 What is that go32-v2.exe program?
  • 22.15 What is DXE?
  • 22.16 Long Filenames Don't Work!
  • 22.17 Make says "missing separator"
  • 22.18 Make says "foo has modification time in the future"
  • 22.19 How to Set Up a Dual DOS/Windows Installation
  • 22.20 What is in that zoneinfo directory?
  • 22.21 The dark secrets of the /dev/ directory...
  • 22.22 How about switching to ELF as DJGPP's object file format?
  • 22.23 How to produce random numbers?
  • 22.24 What are all these buzzwords I see?
  • 22.25 What should the main function return in a C/C++ program?
  • 22.26 Rebooting the PC from a DJGPP program
  • 22.27 Delaying execution for short periods of time
  • 22.28 CGI programs and DJGPP
  • 22.29 Why Do I Get EOF From stdin?
  • 22.30 Generating the FAQ in your favorite format
• 23 About this FAQ
• 24 Topic Index
• 25 Program Index