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Re: problems linking agains a shared library - maybe [OT] ?



Hi,

I have had the problem with fribidi library [that I'm a developer
myself!] several times, and all the times the problem was that It was
linking with an old version of library installed by gtk-fribidi rpm,
the other time, I updated the library, but it was including wrong
header files, ...

Yours,
Behdad

On Mon, 16 Jul 2001, Oded Arbel wrote:

> Hi list !
>
> I'm trying to use a file transfer library called libFerit
> (http://www.mindspring.com/~darkskye/projects/ferit.html). it has an obscure
> build process, which ends putting a .so file in /usr/lib and some header
> files in /usr/include/ferit.
> so I wrote this simple program to test the library :
>
> #include <ferit/Http.h>
>
>  int main(int argc, char *argv[])
> {
>   Http* http = new Http(10);
>   //Url* url = new Url("http://www.cnn.com";);
>   Url* url = new Url("");
>  url->UrlToSession("http://www.cnn.com";);
>  url->Options(OPT_PROGRESS | OPT_RESUME);
>  url->Outfile("index.html");
>  url->Print();
>  if (http)
>        printf("Error status %i\n", http->Download(url, NULL));
>  else printf("Error !\n");
>
>  return EXIT_SUCCESS;
> }
>
> compiled and linked it :
> gcc -o test main.cpp -lferit
>
> now, when I try to run it (from the command line) it segfaults immidietly.
> when run through gdb (with no break points) it segfaults in another place.
> when run through gdb with a break point somewhere at the start (stoping at
> the break point and then continue to the end), or using some gdb front end,
> it runs properly w/o a flaw. when I tried to trace it using KDevelops gdb
> front end (where I first encountered the problem) it crashes when doing
> 'gethostbyname', but deep down in some obscure part of libc, where I see all
> kinds of functions on the stack that have names that start with _dl_.
> from all this I guess this is some sort of linking problem because of using
> a linking paradigm I'm not aware of.
> I've already emailed the author of the library, and he couldn't help me
> except offer some syntax corrections (the commented line was replaced by the
> two lines after it).
>
> the wierd thing is that the library comes with a program that links against
> it and used as a simple client. the simple test above is actually made up of
> selected code lines from this client programs main function. this client
> binary is also being built in a similar matter - but it always runs with no
> problems.
>
> I'm not sure what to do, since all the shared libraries I've built and used
> so far where using libtool which looks completly different..
> help ?
>
> Oded
>
> --
> There are three kinds of lies - lies, damn lies, and statistics.
>
>
>
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-- 
Behdad
25 Tir 1380, 2001 Jul 16

[Finger for Geek Code]


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