Re: [Mingw-users] libstdc++

[Georg F. <fu...@is...>]

A File with the line
#include <iostream.h>

was not compiled if the suffix was ".c" and the compiler was called as "gcc".
But was compiled with the suffix ".cc"  by "gcc" and as ".c" by "g++".



Greg Chicares wrote:
> 
> Georg Fusz wrote:
> 
> > I do NOT know a documentation about the flags set by "gcc" and "g++".
> 
> touch foobar.c
> gcc -dM -E foobar.c |less
> g++ -dM -E foobar.c |less
> 

This list the defined macros, but it does NOT list the default options
of the compiler and the linker.


> > Also: Every clean c-source is a valid c++-source.
> 
> That depends on how 'clean' is defined. All the code in K&R is C++
> as well as C. But there are conforming C programs that are not C++.
> Annex C to ISO/IEC standard 14882 lists oddities like this:
> 
> C:\testing>copy con try_this.c
> int main() {return main();}
> ^Z
>         1 file(s) copied
> 

Really an interesting example of recursion.


> C:\testing>gcc -c -Wall -ansi -pedantic try_this.c
> 

This compiles!

> C:\testing>g++ -c -Wall -ansi -pedantic try_this.c
> try_this.c: In function `int main()':
> try_this.c:1: warning: ANSI C++ forbids calling `main' from within program
> try_this.c:1: warning: taking address of function `main'
> 
> This example does seem to bear out your observation that
> 

I get the warning also with

mainrec.o: main_rec.c mainrec.mak
	g++ -Wall -ansi -pedantic -o $@ -c $< -Wall




> > My experience tells me:
> >
> > The suffix of a file has *NO* meaning for [...] "g++".
> 
> Changing the extension from 'c' to 'cpp' gives 'ANSI C++ forbids...'
> whether you compile it with gcc or g++ .

This means:

gcc differs between files with the suffix ".c" and ".cpp"
g++ works in the same way on files the suffix ".c" and ".cpp".


All this gives no answer to the question:
What is difference between "g++" and "gcc"?


-- 
Georg Fusz
Technische Universitaet Berlin, Germany


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