Re: getting same output as gfortran, long_float

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Mon, 4 May 2015 06:45:19 -0700 (PDT), robin.vowels@gmail.com wrote:

> On Monday, May 4, 2015 at 8:18:37 PM UTC+10, Dmitry A. Kazakov wrote:
>> On Mon, 4 May 2015 01:53:08 -0700 (PDT), r.nospam@gmail.com wrote:
>> 
>>> On Monday, May 4, 2015 at 5:21:28 PM UTC+10, Dmitry A. Kazakov wrote:
>>>> On Sun, 3 May 2015 17:15:15 -0700 (PDT), r.nospam@gmail.com wrote:
>>>> 
>>>>> On Friday, May 1, 2015 at 5:45:23 PM UTC+10, Dmitry A. Kazakov wrote:
>>>> 
>>>>>> Actually REAL*16 is exactly portable.
>>>>> 
>>>>> No it's not.
>>>>> Some compilers treat that is an error.
>>>> 
>>>> Portability applies to compilable programs only. You could not compile
>>>> 
>>>>    type X is mod 2**64;
>>>> 
>>>> either. That does not make it non-portable, IMO.
>>>> 
>>>> Portable means: The program exposes same [logically relevant] behavior on
>>>> all platforms [of interest].
>>> 
>>> Portable means that a program that adheres to the language standard
>>> is capable of running on any system where there is a compiler for that language.
>> 
>> Consider a system without text output. According to you Ada's Hello World
>> program is non-portable because such systems exist.
> 
> I said no such thing. 

No which thing? Ada RTL without Ada.Text_IO?

>> It is a useless definition. For practically any program it would be easy to
>> present a platform for which it would not compile or work or would expose
>> some undesired behavior. Which is why it is *not* all behavior, but only
>> the relevant (contracted) one and not all platforms, but only the intended
>> ones. There is no such thing as absolute unconditional portability,
>> 
>>> There might be different limits for such things as maximum size of number on
>>> different machines, but nevertheless the program is capable of running on
>>> any particular system provided that it does not exceed such limits.
>> 
>> 64 bit is just such a limit.
> 
> So?  Did you read what I wrote?
> If a program is capable of running on a number of different systems
> it is ipso facto portable.

You said, I quote, "any system where there is a compiler for that
language." So is it "any" or "a number" of systems?

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de