Re: Compiling C++ kernel module + Makefile

[Thomas Lahoda]

Not that I'm calling for the use of c++ in a kernel, but if you're going
to argue against it you should get your c++ example correct. You are
erroneously using fstream to get your cout. In c++, cout is an ostream
object. With the above correction compiled using g++ 3.3.2 I get the
following:

-rwxrwxr-x    1 tlahoda  tlahoda      3820 Jan 20 13:27 hello+
-rwxrwxr-x    1 tlahoda  tlahoda      2760 Jan 20 13:30 helloc





On Tue, 2004-01-20 at 18:10, Richard B. Johnson wrote:
> On Tue, 20 Jan 2004, Zan Lynx wrote:
> 
> > On Tue, 2004-01-20 at 08:20, Richard B. Johnson wrote:
> > > Nevertheless, I provide three programs, one written in
> > > C, the other in C++ and the third in assembly. A tar.gz
> > > file is attached for those interested.
> > >
> > > -rwxr-xr-x   1 root     root        57800 Jan 20 10:16 hello+
> > > -rwxr-xr-x   1 root     root          460 Jan 20 10:16 helloa
> > > -rwxr-xr-x   1 root     root         2948 Jan 20 10:16 helloc
> > >
> > > The code size, generated from assembly is 460 bytes.
> > > The code size, generated from C is 2,948 bytes.
> > > The code size, generated from C++ is 57,800 bytes.
> > >
> > > Clearly, C++ is not the optimum language for writing
> > > a "Hello World" program.
> >
> > I like C++ and hate to see it so unfairly maligned.  Here's a much
> > better example:
> >
> > Makefile:
> > helloc: hello.c
> >         gcc -Os -s -o helloc hello.c
> >
> > hellocpp: hello.cpp
> >         g++ -Os -fno-rtti -fno-exceptions -s -o hellocpp hello.cpp
> >
> > Both programs contain exactly the same code: one main() function using
> > puts("Hello world!").
> >
> > # ls -l
> > -rwxrwxr-x    1 jbriggs  jbriggs      2840 Jan 20 10:02 helloc
> > -rwxrwxr-x    1 jbriggs  jbriggs      2948 Jan 20 10:06 hellocpp
> >
> > 108 extra bytes is hardly the end of the world.
> > --
> > Zan Lynx <zlynx@xxxxxxx>
> >
> 
> Well you just fell into the usual trap of using the "C-like"
> capabilities of C++ to call a 'C' function. If you are going
> to use 'C' library functions, you don't use an object-oriented
> language to call them. That is using a hatchet like a hammer.
> 
> I did not malign C++. I used it as it was designed and let
> the chips fall where they may.
> 
> Cheers,
> Dick Johnson
> Penguin : Linux version 2.4.24 on an i686 machine (797.90 BogoMips).
>             Note 96.31% of all statistics are fiction.
> 
> 
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