Xref: news2.mv.net comp.os.msdos.djgpp:4238
From: Francisco Gochez <arcanix AT pop DOT erols DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Moving from pascal to Djgpp
Date: 24 May 1996 19:21:32 GMT
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Message-ID: <4o527s$orc@news7.erols.com>
References: <45709 DOT rkwcvdz AT rivier1 DOT puk DOT ac DOT za>
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To: rkwcvdz AT rivier1 DOT puk DOT ac DOT za
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<rkwcvdz AT rivier1 DOT puk DOT ac DOT za> wrote:
>Hi. I hope someone out there will be able to help me with all the 
>questions that ive got about Djgpp.
>
>I am a fairly effecient Pascal/Delphi programmer , who now has to 
>learn C/C++ .
>
>[1] This is my first experience with C/C++ ,and ive been told to use Djgpp 
>    as it is a true 32bit compiler . Does it have a Dos extender like 
>    Dos/4gw or Borland Pascals (which is a 16 bit extender).
>

No, v2 does not use extenders, only DPMI servers.  It comes with a free 
DPMI server, CWSDPMI (Highly recommended).  Version 1 of DJGPP,however, 
does use an extender.

>[2] Does it support the method of inline Assembly that i am used to  with 
>    Borland Pascal . eg 
>                      Program Example; 
>                      Begin
>                      . 
>                      .
>                          asm 
>                              mov ax,13h
>                              int 10h;
>                           end;
>                       .
>                       end.  
>
No, it is not compatible with intel syntax assembly, it uses AT&T syntax 
instead.  It takes some getting used to, but isn't bad.  The inline 
assembler is quite powerful, though.  The above would go like this:

asm("
movw $0x13, %ax
int $0x10
");

>   Does it come with a external Assembler like Tasm , does the language 
>   differ much from Turbo Assembler .
>

Yes, it does come with an external assembler.  See above for language 
assembly style.
>[3] Does it support the writing and using of Dlls , like borland Pascal.
>    If so , will they be compatible with all my Dlls that ive written with 
>    BP.
>

I'm not sure, but I don't think so.  It does support DXE's, which may be 
similar.

>[4] How good is it for writing games .Code size , effeciency and speed .
>    Does it compile Native 486 and Pentium code . How fast is the code 
>    compared to Watcom C/C++.
Good for writing games (check out Quake), produces fairly large 
executables, and compiles 486 (not pentium as far as I know).  The code 
is reported to be slightly faster than Watcom on average.

>
>[5] Are there many Freeware(im only a student) graphics,sound libs for 
>    Djgpp.
Yes!

>
>[6] How compatible is it with other C/C++ compilers , mostly Watcom and 
>    Borlands Compiler , which is used at work.

It is pretty compatible with other compilers, but since it doesn't use 
extenders, protected-mode library calls or handling may be incompatible 
(???, someone else might be able to clear this up, this is just what I 
think).  Inline asm is incompatible.

>
>[7] I know this question is not relevant to this gropu , but what good 
>    books are there to learn C/C++ , they shouldnt be compiler Specific.
>    Any good game programming Books ....
>
There's a quite a few out there.  I thought that Teach Yourself Game 
Programming in 21 days was excellent for starting off.

>Sorry for making this so long but i want to be sure that im doing the 
>right thing.
>
>Please  post this to my e-mail and not to the newsgroup
>
>Thanx in Advance
>rkwcvdz AT rivier1 DOT puk DOT ac DOT za
>
>******************************************** 
>*                                          *
>*  The Road goes ever on and on            *
>*  Down from the door where it began       *
>*  and now far ahead the road has gone     * 
>*  and i must follow it if i can           *
>*  pursuing it with weary feet             *
>*  until it meets some larger path         *
>*  where many errantries meet and ,        *
>*  wither then i cannot say                *
>*                                          *
>*  J.R.R Tolkien  _The Lord Of The Rings_  *
>*                                          *
>********************************************