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Subject: Re: DJPGG and Windows XP Professional + I think a Undefined Reference or 
 linker problem
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Date: Sat, 08 May 2004 15:15:58 GMT
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

wordsworth wrote:
> "Tom" <Thomas8675309 AT yahoo DOT com> wrote in message
>> Martin Stromberg wrote:
>>> wordsworth <news AT callera DOT net> wrote:
>>
>>>> I have now tried gpp that compiles my prog.  So what is the
>>>> difference between gcc and gpp
>>>
>>> gpp is the C++ compiler and gcc is the C compiler.
>>
>> gcc calls either the C compiler or the C++ compiler (or other
>> programs) depending upon the file suffix of the file provided
>> on the command line.  gpp is the same as gcc (I believe) but
>> links in the C++ standard library by default, while gcc
>> requires that the library be expressly listed on the command
>> line to link it in.  So using gcc on a C++ source file will
>> call the C++ compiler but fail to link in the C++ standard
>> library unless you explicitly tell gcc to do so.  Which is
>> why using gcc on C++ source files can lead to linker errors.
>>
>> (And yes, I recognize that Martin knows the difference and
>> was simplifying to make it easier for new users.)
> 
> Thats almost cleared up this for me.
> 
> Thank you both for your explaination (very helpful); question? 
> The C++ standard library is linked by default with gpp.  How
> does this manifest itself - I dont mean where is the C++
> library, but rather how is it linked? Is it compiled into a
> binary or can I define its location (add config switches) in a
> config file? Basically I should think that the linker error
> can be amended.  I want to avoid having to add extra suff to
> the compiler line when excuting cmd line compiles e.g. gpp
> test.cc -o test.exe.

Please don't top-post, it makes the posts incomprehensible.  I
fixed this one.

Isn't there some fundamental misunderstanding going on here?  gpp
is the preprocessor. g++ is the C++ linking compiler.  gxx is used
under djgpp to replace g++ because the '+' is not valid in a DOS
file name.

If you don't link to a final executable you can use either gcc or
gxx.

-- 
Chuck F (cbfalconer AT yahoo DOT com) (cbfalconer AT worldnet DOT att DOT net)
   Available for consulting/temporary embedded and systems.
   <http://cbfalconer.home.att.net>  USE worldnet address!