Re: Problem In compiling C++ codes

[sherry <sherry at zeroknowledge dot com>]

aaboulhosn@entpm2.prod.fedex.com wrote:

> But , when, I compile in C++   ,   no errors,   But, when I  type:    a.out
> or   ./a.out
> It give me  this Error:
> ld.so.1 :  a.out:  fatal:  libstdc++.so.2.10.0: open failed: No such file
> or directory
>

ld is gnu linker.
man ld will give you a lot of information about what it is and how it works.

So , to me it seems like you linked your executable with dynamic library,
and the linker can not find your library at run time.
(I hope David correct s me, if I am wrong again)
Now the linker does not use PATH to find the dynamic libraries on your system
but you can specify the path using -L option when linking (ld man pages again)

You can also link your program staticly , you should also know the difference
between
static and dynamic linking and advantages and disadvantages of each. (g++ man
pages for static linking)
(depending on you requirements one may be better than the other ......)

There is also the -rpath option that can be set when linking to help the
linker to find the
runtime libraries (check out man ld)
Did you read g++ man pages ? ... you must read it carefully

Another handy command to know is ldd , try
ldd ./a.out
to see what libraries are linked to your executable. (do not forget man ldd
;) )

>
> I checked my PATH:
> PATH=/usr/bin:/usr/local/:/usr/local/lib
>
> libstdc++.so.2.10.0   exist under    this directory:
> /usr/local/lib
>
> I tired to copy : libstdc++.so.2.10.0  to the directory where  a.out is  ,
> (as a test)it does not help

This won't help ;)

>
> Thank you
> I appreciate it if you , continue working with me until I resolve this
> problem
>
> AREF