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Frequently Asked Questions (FAQS);faqs.314


Section 8: Ordering foreign game magazines:
==========================================

The below information comes from James Mathiesen:  To order a British
magazine, call first; pay with a VISA card or an International Money Order:

Title: Computer + Video Games  (computer and console games)
Title: Nintendo Magazine System Mean Machines (Nintendo)
Title: Mean Machines Sega (Sega)
Phone: [phone]

Title: ZONE (console games)
Phone: [phone]

Title: Sega Pro (Sega only)
Phone: [phone]

Title: Sega Force (Sega only)
Phone: [phone]

Title: TOTAL (Nintendo only)
Phone: [phone]


Section 9: Other FAQ's and regular postings:
===========================================

Anime video games list: maintained by Steve Pearl ([e-mail]).
The list can be ftp'ed from romulus.rutgers.edu (128.6.13.2).

Japanese video game source list: ditto.

The Lynx cheat list is on terminator.cc.umich.edu in /atari/lynx.  (Or it was
supposed to be, anyway.  I checked, and it's not there.)

Lynx FAQ: maintained by Robert Jung ([e-mail]).

SNES spoiler list: maintained by Robert Deloura ([e-mail])

Genesis spoiler list: maintained by Bob Rusbasan
([e-mail]).

Megadrive spoilers: collected by Galen Komatsu ([e-mail].
edu).  Not in list form.

TG-16 cheat list/FAQ: maintained by Steve Pearl ([e-mail]).

Vectrex FAQ: maintained by Gregg Woodcock ([e-mail]).

Genesis joystick pinouts: an article was posted by [e-mail].
I presume he'd be able to send you a copy of the article, or if not, I saved
one; it's too long to include here.
--
"the bogosity in a field equals the bogosity imported from related areas, plus
the bogosity generated internally, minus the bogosity expelled or otherwise
disposed of."  -- K. Eric Drexler

Ken Arromdee ([e-mail], [e-mail])
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From: [e-mail] (Joe Buck)
Newsgroups: gnu.g++.help,comp.lang.c++,news.answers
Subject: FAQ for g++ and libg++, plain text version [Revised 16 Dec 1992]
Message-ID: <[e-mail]>
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[ this is the plain text version, the parent is the texinfo version ]
Preface
*******

   This is a list of frequently asked questions for g++ users; thanks
to all those who sent suggestions for improvements.

   I'm looking for new questions, better answers, or both.  One thing
that's missing is a section on templates and template problems with
g++; I'm looking for contributions on this score.

   This FAQ is intended to supplement, not replace, Marshall Cline's
excellent FAQ for comp.lang.c++.  Especially if g++ is the first C++
compiler you've ever used, the question "How do I do <X> with g++?" is
probably really "How do I do <X> in C++?".  You can obtain the C++ FAQ
by anonymous FTP from sun.soe.clarkson.edu [128.153.12.3], in the file
~ftp/pub/C++/FAQ.  (There is also a mail server for that FAQ, but it
seems to be broken).


Obtaining Source Code
*********************


How do I get a copy of g++ for Unix?
====================================

   First, you may already have it if you have gcc for your platform;
see the answer to question 3.

   If you're trying to find g++, you can get it by anonymous FTP, by
anonymous UUCP, by buying a tape from the Free Software Foundation, or
by getting it from a friend that has it.

   Here is a list of anonymous FTP archive sites for Gnu software.

     Japan: ftp.cs.titech.ac.jp, utsun.s.u-tokyo.ac.jp:ftpsync/prep
     Australia: archie.au:gnu
     Europe: src.doc.ic.ac.uk:gnu, ftp.informatik.tu-muenchen.de,
         ftp.informatik.rwth-aachen.de:pub/gnu,
         nic.funet.fi:pub/gnu, ugle.unit.no, isy.liu.se,
         ftp.stacken.kth.se, sunic.sunet.se, ftp.win.tue.nl,
         ftp.diku.dk, ftp.eunet.ch, archive.eu.net
     United States: wuarchive.wustl.edu, ftp.cs.widener.edu,
         uxc.cso.uiuc.edu, col.hp.com, gatekeeper.dec.com:pub/GNU,
         ftp.uu.net:packages/gnu

   The "official site" is prep.ai.mit.edu, but your transfer will
probably go faster if you use one of the above machines.

   Users of the HP Precision Architecture (HP-9000/7xx and
HP-9000/8xx) may want to use the "2.3.1-u2" version available from the
University of Utah, site jaguar.cs.utah.edu.  This version supports
debugging provided that gas is used (you need the version of gas
available from the same place) and has several bug fixes that weren't
done in time for the 2.3.2 release.  Precompiled binaries of gcc and
gdb can also be obtained from that site.  Hopefully this will all be
folded in to 2.4.

   UUNET customers can get Gnu sources from UUNET via UUCP.  For
information on how to order tapes from FSF, write to
[e-mail].

   UUCP-only sites can get Gnu sources by "anonymous UUCP" from site
"osu-cis" at Ohio State University.  You pay for the long-distance call
to OSU; the price isn't too bad on weekends at 9600 bps.  Send mail to
[e-mail] or osu-cis!uucp for more information.

   OSU lines are often busy.  If you're in the USA, and are willing to
spend more money, you can get sources via UUCP from UUNET using their
900 number: 1-900-GOT-SRCS (900 numbers don't work internationally).
You will be billed $0.50/minute by your phone company.

   Don't forget to retrieve libg++ as well!


How do I get a copy of g++ for (some other platform)?
=====================================================

   The standard gcc/g++ distribution includes VMS support.  Since the
FSF people don't use VMS, it's likely to be somewhat less solid than
the Unix version.  Precompiled copies of G++ and libg++ in
VMS-installable form are available by FTP from mango.rsmas.miami.edu.

   DJ Delorie has ported gcc/g++ to MS-DOS; this port is popularly
known as "DJGPP" (the P's stand for "plus").  It can be found on many
FTP archive sites; its "home" is on grape.ecs.clarkson.edu, directory
~ftp/pub/msdos/djgpp.  Make sure you're retrieving the current version,
which should indicate that it is a port of gcc-2.2.2 (2.3.1 and 2.3.2
have been released since then, but I don't think the DOS port is done
yet).  It is also available on site wuarchive.wustl.edu, in directory
mirrors/msdos/djgpp, and many other places as well.

   For information on Amiga ports of gcc/g++, retrieve the file
/pub/gnu/MicrosPorts/Amiga from prep.ai.mit.edu, or write to Leonard
Norrgard <[e-mail]>, who I hope won't be too upset that I
mentioned his name here.

   A port of gcc-2.3.1 to the Atari ST can be found on the site
"atari.archive.umich.edu", under /atari/Gnustuff/Tos, along with many
other Gnu programs.  See the FAQ for the Usenet group
"comp.sys.atari.st" for more information.

   There are two different ports of gcc-2.2.2 (and g++) to OS/2, the
so-called EMX port, which requires a particular Unix emulator, and a
port called "gcc/2", which runs native.  The latter port uses a rather
buggy port of the BSD libc.  For more information ask around on
comp.os.os2.programmer.  gcc/2 can be obtained by FTP from

     ftp-os2.nmsu.edu (128.123.35.151) in /pub/os2/2.0/programming/gcc2-222
     luga.latrobe.edu.au (131.172.2.2) in /pub/os2/2.0/programming/gcc2-222

   Eberhard Mattes did the EMX port.  Tevor Lampre did the gcc/2 port.
Their addresses are [e-mail] and
[e-mail], repectively.

   Because the legal policies of Apple threaten the long-term goals of
FSF, as well as the concept of free software, no support will be lent
to efforts to port Gnu software to Macintosh or other Apple hardware.


But I can only find g++-1.42!
=============================

   "I keep hearing people talking about g++ 2.3.2 (or some other number
starting with 2), but the latest version I can find is g++ 1.42.
Where is it?"

   As of gcc 2.0, C, C++, and Objective-C as well are all combined
into a single distribution called gcc.  If you get gcc you already
have g++.  The standard installation procedure for any gcc version 2
compiler will install the C++ compiler as well.

   One could argue that we shouldn't even refer to "g++-2.x.y" but
it's a convention.  It means "the C++ compiler included with
gcc-2.x.y".


What is the latest version of gcc, g++, and libg++?
===================================================

   The latest "2.x" version of gcc/g++ is 2.3.2, released Nov 27, 1992.
The latest version of libg++ is 2.3, released Dec 9, 1992.

   For some non-Unix platforms, 2.2.2 may be the latest compiler that
has been ported.  libg++ 2.3 will not compile with gcc-2.2.2.  Also,
due to a newly introduced compiler bug, libg++ 2.2 will not compile
with gcc-2.3.1 or gcc-2.3.2.

   The latest "1.x" version of gcc is 1.42, and the latest "1.x"
version of g++ is 1.42.0.


I have gcc-2.2.2 and libg++-2.2.  Should I upgrade to the new versions?
=======================================================================

   Unfortunately, this question cannot be answered with a simple yes
or no.  gcc-2.3.x made some significant improvements in template
support; however, at the same time, quite a few new bugs were
introduced in 2.3.1, particularly in resolving of overloaded
functions.  2.3.2 fixed some of them, but serious problems remain (for
example, 2.3.2 cannot compile some perfectly correct code in
libg++-2.2).  Given this, I would recommend that those not using
templates wait for a more stable release (gcc-2.3.3 should be out
soon).  If you're using templates and 2.2.2 won't cut it for you, by
all means upgrade.


Installation Issues and Problems
********************************


I can't build g++ 1.x.y with gcc-2.x.y!
=======================================

   "I obtained gcc-2.x.y and g++ 1.x.y and I'm trying to build it, but
I'm having major problems.  What's going on?"

   If you wish to build g++-1.42, you must obtain gcc-1.42 first.  The
installation instructions for g++ version 1 leave a lot to be desired,
unfortunately, and I would recommend that, unless you have a special
reason for needing the 1.x compiler, that C++ users use g++-2.3.2, as
it is the version that is being actively maintained.

   There is no template support in g++-1.x, and it is generally much
further away from the ANSI draft standard than g++-2.x is.


OK, I've obtained gcc; what else do I need?
===========================================

   First off, you'll want libg++ as you can do almost nothing without
it (unless you replace it with some other class library).

   Second, depending on your platform, you may need "gas", the Gnu
assembler, or the Gnu linker (see next question).


Should I use the Gnu linker, or should I use "collect"?
=======================================================

   First off, for novices: special measures must be taken with C++ to
arrange for the calling of constructors for global or static objects
before the execution of your program, and for the calling of
destructors at the end.  (Exception: System VR3 and System VR4 linkers
support user-defined segments; g++ on these systems requires neither
the Gnu linker nor collect.  So if you have such a system, the answer
is that you don't need either one).

   If you have experience with AT&T's "cfront", this function is
performed there by programs named "patch" or "munch".  With Gnu C++,
it is performed either by the Gnu linker or by a program known as
"collect".  The collect program is part of the gcc-2.x distribution;
you can obtain the Gnu linker separately as part of the "binutils"
package.

   (To be technical, it's "collect2"; there were originally several
alternative versions of collect, and this is the one that survived).

   There are advantages and disadvantages to either choice.

   Advantages of the Gnu linker:

   It's faster than using collect -- collect basically runs the
standard Unix linker on your program twice, inserting some extra code
after the first pass to call the constructors.  This is a sizable time
penalty for large programs.  The Gnu linker does not require this
extra pass.

   Gnu ld reports undefined symbols using their true names, not the
mangled names.

   If there are undefined symbols, Gnu ld reports which object file(s)
refer to the undefined symbol(s).

   Advantages of collect:

   If your native linker supports shared libraries, you can use shared
libraries with collect.  The Gnu linker does not (yet) support shared
libraries.

   The Gnu linker has not been ported to as many platforms as g++ has,
so you may be forced to use collect.

   If you use collect, you don't need to get something extra and
figure out how to install it; the standard gcc installation procedure
will do it for you.

   In conclusion, I don't see a clear win for either alternative at
this point.  Take your pick.


Should I use the Gnu assembler, or my vendor's assembler?
=========================================================

   This depends on your platform and your decision about the Gnu
linker.  For most platforms, you'll need to use gas if you use the Gnu
linker.  For some platforms, you have no choice; check the gcc
installation notes to see whether you must use gas.  But you can
usually use the vendor's assembler if you don't use the Gnu linker.

   The Gnu assembler assembles faster than many native assemblers;
however, on many platforms it cannot support the local debugging
format.


Should I use the Gnu C library?
===============================

   At this point in time, no.  The Gnu C library is still very young,
and libg++ still conflicts with it in some places.  Use your native C
library unless you know a lot about the gory details of libg++ and
gnu-libc.  This will probably change in the future.


Problems building libg++ on Ultrix
==================================

   "I am having trouble building libg++-2.2 on Ultrix [and possibly
other systems].  I get errors referring to "dummy.o".  Help!"

   (The errors on Ultrix end with something like

     ldopen: cannot open dummy.o
     nm: Error: cannot open dummy.o
     ldopen: cannot open dummy.o
     nm: Error: cannot open dummy.o
     nm failed to find FUNC in dummy.o!
     sh: -1: bad number
     *** Error code 1

and there may be similar problems on other systems).

   The fix for this is to make libg++ by saying "make CC=gcc".


User Problems
*************


Linker reports undefined symbols for static data members
========================================================

   "g++ reports undefined symbols for all my static data members when
I link, even though the program works correctly for compiler XYZ.
What's going on?"

   The problem is almost certainly that you don't give definitions for
your static data members.  If you have

     class Foo {
         ...
         void method();
         static int bar;
     };

   you have only declared that there is an int named Foo::bar and a
member function named Foo::method that is defined somewhere.  You
still need to defined BOTH method() and bar in some source file.
According to the draft ANSI standard, you must supply an initializer,
such as

     int Foo::bar = 0;

in one (and only one) source file.


g++ won't accept the placement new syntax.
==========================================

   "I have a program that uses the "placement syntax" of operator new,
e.g.

        new (somewhere) T;

and g++ won't accept it."

   Up until version 2.3.1, g++ accepted an alternate form of the
placement syntax, for historical reasons; use

        new {somewhere} T;

if you are using g++-2.2.2 or older.

   As of 2.3.1, g++ finally fixed this, using the standard ARM syntax
for "placement new".  A few remaining glitches were fixed in 2.3.2.
The only remaining problem is with declarators for pointers to
functions;

     new (void (*)(int));  // confuses gcc 2.3.2
     new (a) (void (*)(int)); // ditto

   These can be worked around with a typedef:

     typedef void (*fun)(int);
     new fun;
     new (a) fun;


I think I have found a bug in g++.
==================================

   "I think I have found a bug in g++, but I'm not sure.  How do I
know, and who should I tell?"

   First, see the excellent section on bugs and bug reports in the gcc
manual (which is included in the gcc distribution).  As a short
summary of that section: if the compiler gets a fatal signal, for any
input, it's a bug.  Same thing for producing invalid assembly code.

   I will add some extra notes that are C++-specific, since the notes
from gcc are generally C-specific.

   First, mail your bug report to "[e-mail]".  You may
also post to gnu.bug.g++, but it's better to use mail, particularly if
you any doubt as to whether your news software generates correct reply
addresses.  Don't mail C++ bugs to [e-mail].

   If your bug involves libg++ rather than the compiler, mail to
[e-mail].  If you're not sure, you could send your
bug to both lists.

   Second, if your program does one thing, and you think it should do
something else, it is best to consult a good reference if in doubt.
The standard reference is "The Annotated C++ Reference Manual", by
Ellis and Stroustrup (copyright 1990, ISBN #0-201-51459-1); the
reference manual, without annotations, also appears in Stroustrup's
"The C++ Programming Language, Second Edition" (copyright 1991, ISBN
#0-201-53992-6).  Both are published by Addison-Wesley.

   Note that the behavior of (any version of) AT&T's "cfront" compiler
is NOT the standard for the language.


Porting programs from other compilers to g++
============================================

   "I have a program that runs on <some other C++ compiler>, and I want
to get it running under g++.  Is there anything I should watch out
for?"

   First, see the questions on placement new syntax and static data
members.

   There are two other reasons why a program that worked under one
compiler might fail under another: your program may depend on the
order of evaluation of side effects in an expression, or it may depend
on the lifetime of a temporary (you may be assuming that a temporary
object "lives" longer than the standard guarantees).  As an example of
the first:

       void func(int,int);

       int i = 3;     func(i++,i++);

   Novice programmers think that the increments will be evaluated in
strict left-to-right order.  Neither C nor C++ guarantees this; the
second increment might happen first, for example.  func might get 3,4,
or it might get 4,3.

   The second problem often happens with classes like the libg++ String
class.  Let's say I have

   String func1(); void func2(const char*);

   and I say

   func2(func1());

   because I know that class String has an "operator const char*".  So
what really happens is

   func2(func1().convert());

   where I'm pretending I have a convert() method that is the same as
the cast.  This is unsafe, because the temporary String object may be
deleted after its last use (the call to the conversion function),
leaving the pointer pointing to garbage, so by the time func2 is
called, it gets an invalid argument.

   If you think this is ugly, you should know that the ANSI C++
committee is STILL debating the lifetime-of-temporaries problem.

   For now, the safe way to write such code is to give the temporary a
name, which forces it to live until the end of the scope of the name.
For example:

       String& tmp = func1();     func2(tmp);

   Finally, like all compilers (but especially C++ compilers, it
seems), g++ has bugs, and you may have tweaked one.


Why does g++ mangle names differently from other C++ compilers?
===============================================================

   See the answer to the next question.


Why can't g++ code link with code from other C++ compilers?
===========================================================

   "Why can't I link g++-compiled programs against libraries compiled
by some other C++ compiler?"

   Some people think that, if only the FSF and Cygnus folks would stop
being stubborn and mangle names the same way that, say, cfront does,
then any g++-compiled program would link successfully against any
cfront-compiled library and vice versa.  Name mangling is the least of
the problems.  Compilers differ as to how objects are laid out, how
multiple inheritance is implemented, how virtual function calls are
handled, and so on, so if the name mangling were made the same, your
programs would link against libraries provided from other compilers
but then crash when run.  For this reason, the ARM *encourages*
compiler writers to make their name mangling different from that of
other compilers for the same platform.  Incompatible libraries are
then detected at link time, rather than at run time.


What documentation exists for g++ 2.x?
======================================

   Almost none.  The gcc manual describes the C front end, and also
the back end, which is shared by the C++ compiler, but there is almost
no documentation for the C++ front end.  There is a Unix-style manual
entry, "g++.1", in the gcc-2.x distribution; this describes the extra
command-line options that g++ supports, and the #pragma interface and
#pragma implementation directives.

   A draft of a document describing the g++ internals appears in the
2.3.2 distribution (called g++int.texi); it is still incomplete.

   Work is proceeding on a user g++ document; with luck it will appear
in the next release.


What are the differences between g++ and the ARM specification of C++?
======================================================================

   The chief thing missing from g++ that is in the ARM is exceptions
(the other major compilers do not have exceptions either).  There are
bits and pieces of exception code present, but it is not presently
usable.

   While, as of 2.3.1, the "placement new" syntax finally agrees with
the ARM, there are still some problems with it.

   The template implementation is still new.  The implementation in
2.3.2 represents a considerable improvement over that of previous
releases, however.  Still, it has many bugs.

   g++ does not implement a separate pass to instantiate template
functions and classes at this point; for this reason, it will not
work, for the most part, to declare your template functions in one
file and define them in another.  The compiler will need to see the
entire definition of the function, and will generate a static copy of
the function in each file in which it is used.

   As with any beta-test compiler, there are bugs.  You can help
improve the compiler by submitting detailed bug reports.

   [A full bug list would be very long indeed, so I won't put one here.
I may add a list of frequently-reported bugs and "non-bugs" like the
static class members issue mentioned above].


Will g++ compile InterViews?  The NIH class library?
====================================================

   The NIH class library uses a non-portable, compiler-dependent hack
to initialize itself, which makes life difficult for g++ users.  It
will not work without modification, and I don't know what modifications
are required or whether anyone has done them successfully.

   Brendan Kehoe of Cygnus is working on getting NIHCL to build with
g++.  He says, "The NIHCL release will hopefully contain patches to
gcc 2.3 to let it build."

   [ From Stienar Bang <[e-mail]> ]

   The C++ compiler part of gcc-2.3 (when released) *should* be able to
compile InterViews release 3.1 (when released) out of the box (no
patches required on either side).

   [ Now that 2.3.1 is out, is this true? ]


Debugging on SVR4 systems
=========================

   "When I use the -g flag on C++ code on a System V Release 4 system,
I get lots of undefined symbols at link time.  Why?  Help!"

   [From Ron Guilmette:] The changes needed to get the g++ front-end
to generate proper DWARF style debugging information for System V
Release 4 are not yet completed, nor will they be until g++ version
2.4 (at the earliest).

   There is nothing that you (as an end-user) can do to correct this
problem.  (It is actually *many* problems, and they are all very
complex.)  Until the g++ maintainers have time to fix this, you should
simply *avoid* using the -g option when using g++ on SVR4.


What are the rules for shipping code built with g++ and libg++?
***************************************************************

   "Is it is possible to distribute programs for profit that are
created with g++ and use the g++ libraries?"

   I am not a lawyer, and this is not legal advice.  In any case, I
have little interest in telling people how to violate the spirit of the
Gnu licenses without violating the letter.  This section tells you how
to comply with the intention of the Gnu licenses as best I understand
them.

   The FSF has no objection to your making money.  Its only interest
is that source code to their programs, and libraries, and to modified
versions of their programs and libraries, is always available.

   The short answer is that you do not need to release the source to
your program, but you can't just ship a stripped executable either.

   Compiling your code with a Gnu compiler does not affect its
copyright; it is still yours.  However, in order to ship code that
links in a Gnu library such as libg++ there are certain rules you must
follow.  The rules are described in the file COPYING.LIB that
accompanies gcc distributions; it is also included in the libg++
distribution.  See that file for the exact rules.  The agreement is
called the Library Gnu Public License or LGPL.  It is much "looser"
than the Gnu Public License, or GPL, that covers must Gnu programs.

   Here's the deal: let's say that you use some version of libg++,
completely unchanged, in your software, and you want to ship only a
binary form of your code.  You can do this, but there are several
special requirements.  If you want to use libg++ but ship only object
code for your code, you have to ship source for libg++ (or ensure
somehow that your customer already has the source for the exact
version you are using), and ship your application in linkable form.
You cannot forbid your customer from reverse-engineering or extending
your program by exploiting its linkable form.

   Furthermore, if you modify libg++ itself, you must provide source
for your modifications (making a derived class does not count as
modifying the library -- that is "a work that uses the library").


--
Joe Buck    [e-mail]
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From: [e-mail] (Joe Buck)
Newsgroups: gnu.g++.help,comp.lang.c++,news.answers
Subject: FAQ for g++ and libg++, texinfo version [Revised 16 Dec 1992]
Followup-To: poster
Date: 17 Dec 1992 00:21:43 GMT
Organization: University of California, Berkeley
Lines: 665
Approved: [e-mail]
Expires: +1 month
Message-ID: <[e-mail]>
NNTP-Posting-Host: forney.berkeley.edu

Archive-name: g++-FAQ/texi
Last-modified: 16 Dec 1992
Frequency: bimonthly

[ This is the texinfo version.  If you don't know what texinfo is,
  then you probably want to use the companion plain-text version. ]

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@c %**start of header
@setfilename g++FAQ.info
@settitle Frequently asked questions about the Gnu C++ compiler
@setchapternewpage odd
@c version: %W% %G%
@c %**end of header