Difference is obvious......since g++ uses a different set of libraries.
-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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