Simtel MSDOS 1993 May/SIMTEL_0593.ISO/msdos/gnuish/00readme.gcc

Text File | 1992-07-05 | 25KB | 593 lines

This is README.1ST, which you should have read before any other.  Please
read this COMPLETELY before going any further.

WARNING: This software comes with ABSOLUTELY NO WARRANTEE.  I can't even
guarantee that this software won't wipe out your entire hard drive (it's
happened to a few people).  USE AT YOUR OWN RISK! It's always a good
idea to make regular backups of your hard drives anyway.

If you are using PKUNZIP to extract your files, don't forget the -d or
you'll get them all in the same directory! All djgpp modules are
designed to be unzipped from the same directory, so that they install
themselves properly.

djgpp is a complete 32-bit C and C++ development environment for DOS.
This product is intended for users who have experience using Unix, not
DOS users who expect djgpp to act like any other DOS compiler.  This is
NOT the software you want if you want to learn programming.

Supported: 80386, 80387, 80486, XMS, himem.sys, VCPI, QEMM, 386MAX,
DesqView.

Unsupported: XTs, 80286, Windows (because Microsoft won't support DPMI
1.0), OS/2, multitasking, signals.

Features: 80387 emulator, 32-bit unix-ish environment, flat memory
model, debugger, SVGA graphics.

    ====================  Reporting bugs  ====================

ALL changes to the source code should be submitted in "diff -c2" format.
If you just send replacement files, I'll reject them, since I don't know
which parts you've changed and my sources keep changing anyway.

Note that new features are not bugs.  If you would like to work on
adding features to djgpp, please send me e-mail at [e-mail]
beforehand, in case it's being worked on already and to coordinate it's
integration.  If you want to request a new feature but not work on it,
send to the mailing list.

If the problem is in one of the FSF utilities, please don't expect me to
fix it.  Problems with FSF code should be reported to the FSF; I only
compile the code and distribute it.  My best suggestion is to post to
the appropriate newsgroup or mailing list, but if you can't find one,
try [e-mail].

If the problem is in anything else, and you have e-mail access, I strongly
recommend joining the djgpp mailing list.  To do so, send mail to
[e-mail]:

    $ mail [e-mail]
    Subject:
    help
    add djgpp
    ^D

Any mail sent to [e-mail] will get automatically
forwarded to all the subscribers on the list, and someone may have an
answer to your query.  Note that I (DJ) am of course a subscriber, so I
will get it also.

If all else fails, you may contact me directly at [e-mail]
(preferred) or at home:

    DJ Delorie
    24 Kirsten Ave
    Rochester, NH 03867-2954
    USA

    ====================  Redistribution  ====================

The utilities built from FSF code may NOT be made available through any
means not prepared to also distribute the source for those utilities.
This isn't just a good idea, it's the LAW.  Read the file "copying" for
more details on FSF copyright terms.  Since djgpp includes such
binaries, it requires the same terms.

Programs that link in FSF code must comply with the GNU Library Licence,
or the GNU public license.

I strongly recommend prepending stub.exe (use aout2exe) for any programs
you intend to distribute.  This avoids me requiring a royalty, and aids
upgrading go32, since stub.exe doesn't change.


This is the README file for DJ's GCC port to DOS ("djgpp")

Contents:
    * Overview
    * What's available
    * How to install
    * Deviations and Caveats
    * Copyright information

Disclaimer: This software is distributed WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

DJ Delorie
USmail: 24 Kirsten Ave, Rochester, NH 03867-2954, USA
email:  [e-mail]

mailing list: [e-mail] ([e-mail])




Overview:

This package contains a 32-bit 80386 DOS extender with symbolic
debugger, a C/C++ compiler with utilities, development libraries, and
source code.  It generates full 32-bit programs and supports full
virtual memory with paging to disk.

Requirements:

A 80386-based IBM compatible PC or PS/2, approximately 4-5Mb of hard
drive space, and 512K RAM.

Supported Wares:

* Up to 128M of extended memory (expanded under VCPI)
* Up to 128M of disk space used for swapping
* SuperVGA 256-color mode up to 1024x768
* 80387
* XMS & VDISK memory allocation strategies
* VCPI programs, such as QEMM and 386MAX

Unsupported:

* DPMI programs, such as Windows 3.0
* Multiprocessing (fork())




File location:

    host:      grape.ecs.clarkson.edu
    login:     ftp
    password:  send your e-mail address
    directory: ~ftp/pub/msdos/djgpp

Many thanks to the sysops at Clarkson for providing a home to djgpp!

As a convenience to non-FTP users, djgpp is also stored on Clarkson's
archive server, sun.soe.clarkson.edu.  To access the archive server,
do this:
   % mail [e-mail]
   Subject: <none>
   help
   index msdos/djgpp
   ^D

NOTE: In accordance with FSF CopyLeft, you are not allowed to upload
this program to a distribution site unless that site also makes the FSF
sources for these programs available.  Please read the file COPYING for
more details.  FSF sources are available on prep.ai.mit.edu, and on
either grape.ecs.clarkson.edu or sun.soe.clarkson.edu

NOTE: If your application links in object modules that were written
by FSF, your application counts as a "derived work" and must obey
the provisions of the FSF Copyrights.  See the file COPYING for
details.  Specifically, the C++ classes in libc.a and obstacks are
FSF works that are covered by the GNU GPL.  The mere act of compiling
does not affect the copyright status of your program.









INSTALLING:

To install, you must do the following:

* Create a "temp" directory, like c:\tmp.

* Create a directory to install in, like c:\djgpp.

* Un-zip djgpp.zip in the install directory.
    C:\DJGPP> pkunzip -d djgpp.zip

* Add the following lines to C:\AUTOEXEC.BAT:
    set COMPILER_PATH=c:/djgpp/bin
    set C_INCLUDE_PATH=c:/djgpp/include
    set CPLUS_INCLUDE_PATH=c:/djgpp/cplusinc:c:/djgpp/include
    set OBJC_INCLUDE_PATH=c:/djgpp/include
    set OBJCPLUS_INCLUDE_PATH=c:/djgpp/include
    set LIBRARY_PATH=c:/djgpp/lib
    set TEMP=c:/tmp
             ^^^ this is where gcc's temp files go
    set GO32TMP=c:/tmp
                ^^^ this is where your paging file goes
    set GO32=ansi driver c:/djgpp/drivers/SOMETHING.grd gw 1024 gh 768
                         ^^^ whatever driver works with your VGA (optional)
    set BISON_SIMPLE=c:/djgpp/lib/bison.simple
    set BISON_HAIRY=c:/djgpp/lib/bison.hairy
    set FLEX_SKELETON=c:/djgpp/lib/flex.skeleton

  GO32TMP is where go32 puts its paging file (TMP and TEMP are checked,
  in that order, also)

  Remember that unless you manually type these at the command line,
  they won't take effect until you reboot.  Don't include the "ansi"
  keyword in the "go32" variable if you don't have an ANSI.SYS driver
  or equivalent.

* Add your binaries directory to your PATH in C:\AUTOEXEC.BAT
    SET PATH= . . . ;C:\DJGPP\BIN

That's it! djgpp is now installed on your system.





The GO32 environment variable:


This variable controls the options available in go32 or debug32.  The
syntax of this variable is:

  SET GO32=[parm [value]] [parm [value]] . . .

Parameters:

  ansi           Use ANSI commands to control the color in debug32
  mono           Use the Monochrome monitor for debugging - useful when
                   debugging graphics applications
  1rm            Redirect stdout (file #1) to the monochrome monitor
  2rm            Redirect stderr (file #2) to the monochrome monitor
  1r2            Redirect stdout (file #1) to stderr (file #2)
  2r1            Redirect stderr (file #2) to stdout (file #1)

  glob           enable globbing (default)
  noglob         disable globbing

  emu [path]     Use the specified file as the 80387 emulator

  driver [path]  Use the specified file as the graphics driver
  gw [width]     Default graphics width
  gh [height]    Default graphics height
  tw [width]     Default text width
  th [height]    Default text height
  nc [colors]    Number of colors (for new-style drivers only - see cbgrx100.zip)


These parameters may occur in any order.

Note that "1rm" and "2rm" are done before "1r2" and "2r1", so "1rm 2r1" sends
stdout to the mono monitor and stderr to any redirection used.

Examples:

  C:\> set GO32=mono driver c:\djgpp\drivers\tseng4k.grd gw 1024 gh 768 tw 132 th 43 nc 256
  C:\> set GO32=ansi
  C:\> set GO32=driver c:\djgpp\drivers\tseng4k.grd ansi
  C:\> set GO32=mono 1rm 2rm










Deviations and Caveats:

GCC/G++ deviates from the U**x version in a number of ways, mostly to
accomodate deficiencies in the MS-DOS environment, and my own laziness.

* An 80387 is required to do floating point.  An emulator is provided.
  cc1 and cc1plus shouldn't use the 387 unless compiling floating point
  code.  The environment variable "387" can override the auto-detection
  routine:
    SET 387=YES   to force 387 handlers to be enabled
    SET 387=NO    to force 387 accesses to fault
    SET 387=QUERY to get a message showing the results of the auto-detection
  If no 80387 is present and the program attempts to use it, a message
  indicating where the instruction is will be displayed.  To use the
  387 emulator, add "emu c:\djgpp\emu387\emu387" to the GO32 environment
  variable.  Specifying use of the emulator overrides the "387"
  environment variable.

* The VDISK method of allocating extended memory is supported.  The
  INT 15h method is also.  When the extender runs out of conventional and
  extended memory, it uses a paging file named $(GO32TMP)/pageXXXX.386, where
  XXXX is an unspecified hex value.  This file is normally removed on exit.

* Up to 128 MB of physical memory and 128 MB of disk swap space are allowed.
  A 512K machine is sufficient, but very slow due to paging.

* The utilies support the MS-DOS standard response file method for giving
  more than 128 bytes of command line.  Example: "gcc -o foo @foo.lnk" where
  foo.lnk contains a list of .o files.  Wildcard expansion (globbing) is
  performed on the parameters, unless they are surrounded by single quotes.
  Double quotes can be used to prevent spaces from separating arguments.

* Since MS-DOS does not distinguish case in file names, some .h files
  used for C++ have had underscores prepended to them to avoid conflict
  (ie: String.h conflicts with string.h, so it became _String.h).

* When using ar to create archives, be warned that the ar version
  supplied cannot update an archive that's been sequenced (ar s foo.a),
  and cannot sequence a file that's been sequenced.  Also, ld cannot
  use an archive that's not sequenced.  The following method is suggested:
      ar rv mylib.a $(OBJS)
      cp mylib.a mylib2.a
      ar rvs mylib2.a
      (and then link with mylib2.a)

* The extender can be added to any gcc-compiled program by copying go32.exe
  to be <program>.exe, where <program> is the 32-bit program.  For example,
  if "hello" is a gcc-compiled a.out file, and "hello.exe" is a copy of
  go32.exe, then when "hello.exe" runs, it loads the file called "hello"
  in the same directory, and executes it if present.  Otherwise,
  the first parameter is the executable (ie: go32 cc1plus foo.cc).

* The extender can be merged to create one .exe file that is the extender
  and the executable in one file, by using the stub.exe program:
      copy /b stub.exe+myprog myprog.exe
  This will only work if go32.exe is in your search path, because stub.exe
  runs it.  Alternatively, you can prepend go32.exe itself to an a.out file
  to get a single executable (stub.exe is much smaller).  Note that if
  you re-compile go32 or stub, you must strip off the symbol table first.

* The extender runs programs at logical address 0.  A copy of the first
  1 MB of physical memory (including the AT channel) is mapped to
  0xE0000000 in the program's address space.  The stack grows down from
  0x7FFFFFFC in the program's address space.  Data usually starts at
  0x00400000.

* The paging mechanism understands how SuperVGA's map their memory onto
  the AT bus and automatically swaps pages as the program tries to
  access them.  The program sees a linear range from 0xD0000000 to
  0xD0100000 that corresponds to each pixel in the 256-color modes
  of SuperVGAs.  To use this feature, you'll have to set the GO32
  environment variable like this:
    C>set go32=driver c:\djgpp\drivers\tseng4k.grd gw 640 gh 480 tw 132 th 43
  These parameter pairs can be omitted or rearranged as needed.  They are
  the "driver" name, default graphics width and height, and default
  text width and height. Libgr.a doesn't have to be recompiled, nor
  do graphics programs, when a different graphics mode is selected
  (the extender handles it).  It is strongly recommended that the program
  use the GR_default_graphics and GR_default_text modes to switch to
  graphics or text.  These modes use the parameters specified by the
  GO32 environment variable, allowing the user to select a favorite
  graphics and text mode.

* Symbols are stored in virtual memory, so you won't run out of symbol
  space until both extended memory and the disk are all used up.  For
  large programs, you might notice a slight delay while it looks up
  symbols.  Programs with a lot of lines in a given module may run out
  of memory as the line number table is built in real memory and transferred
  to virtual memory.

* Signals are not reported to the program.  However, interrupts do continue
  to get serviced while in protected mode (ie: keypress, timer, etc).
  CTRL-C will get you back to the debugger in debug32, and you can continue
  from where you stopped.  All signals (ie: exceptions) cause debugging
  traps in debug32, or general faults in go32.



Copyright Information:

* Source code for the GNU utilities is copyright (c) Free Software Foundation.
  For more information on the FSF copyright, see their source code or write
  Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

  A copy of their file "COPYING" is included in the docs directory.  Some of
  the FSF source code has been modified to operate properly in the MS-DOS
  environment.

* Source code for most of libc.a are copyright (c) Regents of the University
  of California.  These files include copyright information in them.  The
  utilities are compiled against these libraries, and thus contain software
  developed by the University of California, Berkeley, and its contributors.
  Some of the BSD source code has been modified to operate properly in the
  MS-DOS environment.

* Any sources not falling under the copyrights of FSF or UCB (as above) are
  Copyright (c) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954.
  To contact me via E-Mail, sent to "[e-mail]".  Cabletron Systems Inc
  is in no way involved with this project; I just happen to work for them
  during the day.

Terms and Conditions:

* Source code copyright FSF is distributed under the terms of the GNU
  Public General License.  See the file "COPYING" in doc.arc for more
  information.  If your program links in object modules (in libc.a) that
  are compiled from GNU sources, then your entire program must be
  distributed under the terms of the GNU GPL as a "derived work".  These
  modules are the C++ class library (including the streams classes) and
  obstacks.  The sources in libsrc have the copyright notices in them
  for the various modules.

* Source code copyright UCB is distributed under the terms listed in the
  UCB source code itself.

* Source code copyright DJ Delorie is distributed under the terms of the
  GNU General Public Licence, with the following exceptions:
  ("go32.exe" refers to go32.exe and debug32.exe)

  * There are no conditions on distributing copies of stub.exe as
    it is originally distributed in this software package.

  * If a user creates an application, prepends a copy of go32.exe onto
    the beginning of it, and distributes it free of charge, then the
    user is under no obligations to distribute source or pay royalties.
    Note that the copyright terms of the FSF and/or UCB must be
    obeyed regardless of this.

  * If a user creates an application, prepends a copy of go32.exe onto
    the beginning of it, and charges a fee for the software, then a
    royalty of $5 or 5% of the selling price per copy sold must be paid
    to DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954.  Note that
    shareware programs are not considered "sold" until payment is rendered
    for them.

  * For all other cases, source code for go32.exe must be distributed
    with any distributed copies of go32.exe.

  * Software that requires go32.exe to run, but is not distributed with
    a copy of go32.exe, incurs no obligations with regards to the
    above sections.

  * Contact me for special terms if none of the above are suitable.

  * Donations are always appreciated.

  The intent of this copyright is this: If you make money by using the
  programs I wrote, I get some of it.  If you use your sources to
  teach others how to write programs, I'll support you.

  Changes to source code copyright BSD or FSF are copyright DJ Delorie, but
  fall under the terms of the original copyright.





Donations may be made to any of the following:

    DJ Delorie
    24 Kirsten Ave
    Rochester, NH  03867-2954
    USA

    Free Software Foundation
    675 Mass Ave
    Cambridge, MA  02139
    USA

    Computer Systems Research Group
    Computer Science Division, EECS
    University of California
    Berkeley, California  94720
    USA

Q: When I run "gcc e:\proj\prog.c" it says "undefined escape sequence \p"?
A: Gcc is a *unix* compiler - you must use *unix* slashes (e:/proj/prog.c).
   Environment variables (like GCCINC) may, however, use either, as they
   are converted.

Q: I type "GCC PROG.C" and ld complains about PROG.C not being an object.
Q: I type "gcc prog.cxx" to compile a C++ program, and ld complains.
A: Gcc is *not* case insensitive like DOS is, and it uses the file's
   extension to determine how to compile a file.  Valid extensions are:
     .cc = C++ source (passed through cpp)
     .c = C source that must be passed through cpp first
     .i = raw C source (no cpp pass)
     .S = assembler that must be passed through cpp first
     .s = raw assembler source (no cpp pass)
   any other file is passed to the linker

Q: I compile my program, but can't run the output file.
A: DOS doesn't know how to run unix-style a.out files.  That's what the
   extender is for.  To run an a.out file called myprog, type
     "go32 myprog . . ."

Q: Gcc doesn't recognize // as a comment in my C programs.
A: That's because // isn't a comment in C.  If you want to compile C++,
   then write C++ programs.  Gcc is really two compilers in one, not
   one compiler that compiles both C and C++.  That's why you get
   cc1 and cc1plus.

Q: I'm reading in data files, but the data gets corrupted.
A: The default file type is DOS text, even for read() and write().  You must
   tell the system that a file is binary through the "b" flag in fopen(),
   or O_BINARY in open().

Q: I get "fatal signal 2" when I run gcc.
A: When gcc reports a "signal", it really means that an error occurred
   trying to run the given program.  The "signal" number is the DOS error
   code, and 2 means "file not found".  Check the COMPILER_PATH environment
   variable and make sure it points to the directory with cpp.exe,
   cc1.exe, etc.

Q: The binaries I get with the distribution are .exe files, but gcc creates
   a.out files.  I rename the a.out's to .EXE's, but they still don't work.
A: To get an .EXE from an a.out, you must *prepend* either go32.exe,
   debug32.exe, or stub.exe to the file.  A program called "aout2exe"
   is provided to do this.  Just run "aout2exe myprog".

Q: What is stub.exe?
A: Stub.exe simply calles go32.exe, and passes it information it needs to
   run the a.out file attached to it.  Stub is much smaller than go32, so
   less disk space is used.  Also, if you change go32, you don't have to
   change stub, and all the stub-ized programs will use the new go32
   automatically.

Q: I want to change cc1.  How do I do this?
A: First, get the GNU sources from FSF.  They're usually available at
   prep.ai.mit.edu in /u/emacs, if not elsewhere.  Use djtarx to un-tar
   them, as djtarx knows how to handle unix file names that aren't valid
   DOS file names.  Look in the "diffs" sources to see what to change the
   names to when they conflict.  Next, apply the "diffs" (if any) over the
   GNU sources (making sure you have the right version of GNU - see the
   versions file).  For gcc 2.0 and above, you must run "configure go32"
   to prepare the sources for a native go32 compiler before building.
   For all other programs, just run make.  Note that the makefiles
   are tuned for ndmake, since it knows how to make response files.
   Specific instructions are documented in the diffs directory.

Q: I don't have an 80387.  How do I compile floating point programs?
A: Add "emu c:\djgpp\emu387\emu387" to the GO32 environment variable
   (see go32 section in readme).  This tells go32 to use the given file
   as an 80387 emulator.  If you don't load this emulator, and you try
   to run floating point without a 387, you will get an error.

Q: I installed an 80387 emulator in my AUTOEXEC, but it still doesn't
   work.  Why?
A: The CPU is running in *protected* mode, not real mode, and the information
   needed to emulate the 80387 is different.  Not to mention that the
   exceptions never get to the real-mode handler.  You must use the emu387
   emulator, which is designed for go32.

Q: I can't run a.out programs under Windows.
A: Nope, you can't.  Go32 only supports VCPI, and Windows provides
   DPMI 0.9, which isn't enough for Go32 to work correctly.

Q: Can I run this on my 286?  It has protected mode also...
A: True, but the 286 isn't a 32-bit processor.  A 386 really is required.

Q: Can I use gcc on my 512K machine?
A: Yes, but the disk better have at least 4Mb of free space for paging.
   Go32 will use all available extended memory (up to 128M) and up to
   128M of disk space, for a grand total of 256M of virtual memory for
   your application.  Try a malloc(50*1024*1024) some day.

Q: Why do my compiles are running VERY SLOW, even though I use a ramdisk
   for swap and a disk cache?
A: Gcc requires at least 1Mb of virtual memory to run, usually close to 1.5M.
   If there isn't this much real memory available, it starts paging to disk.
   It's good to leave about 1M of extended (not expanded) memory available
   for go32 to run programs with.  When it needs to page a lot, you spend
   most of your time paging and little time actually running.  Note that
   if you are running with a VCPI server, like QEMM or 386MAX, then go32
   will use *expanded* memory for it's physical memory needs, not
   extended.

Q: How much memory is available when I use the system() call?
A: Everything but what go32 is loaded with.  The program is completely
   paged out to memory (including the page tables themselves) before
   the second program is executed.  Currently, this is about 100K
   less than was available before go32 was executed.

Q: Go32 complains that the CPU must be in V86 mode to run.
A: When the CPU is in V86 mode, the V86 manager must provide VCPI
   services for go32.  Since VCPI is an extension to EMS, disabling EMS
   will disable VCPI, and prevent go32 from running.  For emm386.sys, this
   means that you can't use the "noems" switch.

Q: How do globbing and response files work?

A: A response file is a file that contains stuff that goes on the command
   line, but is too big for DOS.  The name of the file is given as "@file"
   to any a.out program, and go32 reads the file for command line
   information.  It uses single and double quotes to group parameters, and
   backslashes to escape quotes, spaces, tabs, newlines, and backslashes.
   Parameters containing wildcards are expanded if they can be, else they
   are unmodified.  Surrounding a parameter in single quotes will prevent
   wildcards from being expanded.  This is similar to unix.  Note that
   backslashes are not special if they are not in front of a quote,
   whitespace, or backslash.