C++ types

[Karl Larsen]

Ian Malone wrote:
> Karl Larsen wrote:
>>
>>    I was told there is only one kind of C++ in Linux. I was surprised 
>> and looked at man gcc and direct that person to the section headed:
>>
>>    Options Controlling C Dialect
>>
>>       The following options control the dialect of C (or languages 
>> derived
>>       from C, such as C++, Objective-C and Objective-C++) that the 
>> compiler
>>       accepts:
>
> Unfortunately only one of these is C++[1][2].  By dialect they mean
> the standard used for each one.  In C mode that means whether to
> support the C90 or C99 standards and whether gnu and other extensions
> to the language should be supported.  Which can have interesting
> effects on the availability of GNU or Posix functions like getopt.
> The C++ mode will do the equivalent for that language.
>
>>       -ansi
>>           In C mode, support all ISO C90 programs.  In C++ mode, 
>> remove GNU
>>           extensions that conflict with ISO C++.
>>
>>
>>    This is what I was in referance to. I wonder what C Dialect 
>> Windows uses?
>>
>
> MS own dialect.  They tend to choose (particularly with C++) what
> bits to support and what not to and like all other compiler vendors
> will provide their own extensions.  Further support varies between
> the different versions.  Visual C++ 6 was notorious for some bits
> of its C++ support, though many of these were later patched.
>
> I can only really speak about C, not C++, but in both MS and GCC
> compilers support for the latest version of the C99 standard is not
> complete (N.B. that some parts will require support in the
> underlying library, glibc for GNU).  Some parts of the standard are
> implemented as extensions.
>
> The best way to stay safe in terms of portability is to stick to
> the published standard and run your compiler in conforming mode,
> but often confounding factors will make this difficult.
>
> [1] Attempts to treat C++ as a superset of C eventually lead to pain.
> [2] Objective-C++?  I'd like some of whatever they're having please.
>
    When I was MUCH younger and using an old Fortran because that was 
what we had, I learned about the subtle changes you can make by a simple 
change. I tried to compile some of my old code on the Linux Fortran 97 
and they would all error out. I fixed them and it was not too hard. 
Around 1970 I got interested in C. I still have books of that vintage 
and was amazed that Unix was made with C. At that time I think ANCI C 
was in style.



-- 

	Karl F. Larsen, AKA K5DI
	Linux User
	#450462   http://counter.li.org.