"Narendra Kumar.S.S" <ssnkumar at gmail.com> writes:
> Difference is obvious......since g++ uses a different set of libraries.
That is why used a test which used no "obvious libraries", only
the implicit crt1's and such.
Anyway, you are right. C++ is mostly a vastly powerful
pre-processor built over C with libraries to match. If you
don't use those features or those libraries, you will get
only the overhead and not the benefits.
Err.. no, I am not fighting a language war ;-)
cheers
Binu
> -Narendra
>
>
> On 4/7/06, Binu Jose Philip <[[binu.j.philip at sun.com]]> wrote:
>
> Ananth A <[[writetoananth at gmail.com]]> writes:
>
> >>?? Yeah C++ compilation is always slower due to overheads. Have you
> tried
> >>?? adding?? extern "C"??for you hello world program to force C linkage
> and
> >>?? disable the C++
> poly-mangled-virtual-inherited-temporarily-constructed-
> >>?? referential overheads ??? I dunno whether this will help though. :-P
> >
> > not just compiling but execution speed ( as per wall clock) is also
> slower.
> >
> > most of the overheads were disabled using the cmd line options to
> g++...
>
> As I understand it, the difference is what you link with unless
> you are compiling c++ code. I have this snippet in x.c:
>
> int
> main()
> {
> ????????int i;
> ????????i = 1;
> ????????return (0);
> }
>
> $ gcc -c x.c
> $ g++ -o xCC -c x.c
> $ gcc -o x_c x.c
> $ g++ -o x_cc x.c
>
> ------- at ---- tmp> ls -l x*
> -rw-r--r--?? 1 -------??staff???????? 46 Apr??7 23:04 x.c
> -rw-r--r--?? 1 -------??staff????????630 Apr??7 23:06 x.o
> -rw-r--r--?? 1 -------??staff????????630 Apr??7 23:06 xCC.o
> -rwxr-xr-x?? 1 -------??staff?????? 6004 Apr??7 23:04 x_c
> -rwxr-xr-x?? 1 -------??staff?????? 6108 Apr??7 23:05 x_cc
>
> $ diff x.o xCC.o
> $ diff x_c x_cc
> Binary files x_c and x_cc differ
>
> Needless to say startup is where the speed difference must be.
>
> cheers
> Binu
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> --
> Warm Regards,
> S.S.Narendra Kumar
> Visit my blogs at:
> [[http://ssnarendrakumar.blogspot.com/]]
> [[http://blogs.sun.com/roller/page/ssnkumar]]
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