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From: Michael S <already5chosen@yahoo.com>
Newsgroups: comp.lang.c
Subject: Re: C23 thoughts and opinions
Date: Sun, 26 May 2024 15:39:13 +0300
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On Sun, 26 May 2024 13:44:32 +0200
jak <nospam@please.ty> wrote:

> Keith Thompson ha scritto:
> > jak <nospam@please.ty> writes:  
> >> Kaz Kylheku ha scritto:  
> >>> On 2024-05-24, jak <nospam@please.ty> wrote:  
> >>>> Bonita Montero ha scritto:  
> >>>>> Am 23.05.2024 um 21:49 schrieb Thiago Adams:  
> >>>>>> On 23/05/2024 16:25, Bonita Montero wrote:  
> >>>>>>> I ask myself what the point is in further developing a
> >>>>>>> language like this that can actually no longer be saved.  
> >>>>>> do you mean C++?
> >>>>>>  
> >>>>>
> >>>>> No, C.  
> >>>>
> >>>> I think you have a lot of confusion about programming languages.
> >>>> C and C++ are not comparable languages.  
> >>> Except for observations like that we can write useful, production
> >>> software that compiles as C or C++, but go on ...  
> >>
> >> Indeed there are c++ compilers who, if used to compile c code,
> >> could decide to call the c compiler to do the work, but if
> >> something in the code is not strictly c, then the compilation will
> >> be in c++, the size of the executable will increase significantly
> >> and will need of an internal or external runtimer to work. If it
> >> were the same thing you would not get different things.  
> > 
> > Oh?  Do you know of a C++ compiler that actually behaves this way?
> > I've never heard of such a thing.
> > 
> > C and C++ are closely related, and C and C++ compilers often share
> > backends, but the two languages have different grammars.  The gcc
> > command, for example, can invoke either a C or C++ compiler, but it
> > knows which language it's compiling based on the source file name or
> > command line options, before it's even seen the content.
> > 
> > There are programs that are valid C and valid C++ but with different
> > behavior.  How would a compiler that behaves as you describe cope
> > with that?
> >   
> 
> For example g++ makes something similar: if you pass a file .C it
> compile the C code but if the file (.C) contains C++ code then
> compile C++.
> 

No, it does not.
g++ compiles as C++ unless you tell it to compile as C with '-x c'
option.