Re: why can gcc find -lcrypt but not -lcfont (both in /lib)?
On Tue, Sep 05, 2000 at 11:42:51PM -0400, Daniel Barclay wrote:
Simply because the -l option links static libraries, those which end
in .a and not dynamic ones (.so).
When you try to compile with libcrypt, it not uses the one in /lib; it
uses the /usr/lib/libcrypt.a instead.
The same happens with libdb... you have libdb1.a but not libdb2.a.
I don't know what you have to do to use dynamic shared libraries, but
it is a completly different thing that static ones.
Hope this help.
>
> How can I find out exactly where gcc and ld look for libraries?
>
> The manual pages mention a default search mechanism, but never say exactly
> what that is, how it works (where it's configured on Linux or specifically
> Debian), or what the default search directories are.
>
>
> The problem I'm having is that gcc seems to see some libraries in /lib and
> not others, and similarly sees some libraries in /usr/lib but not others.
>
>
> For example, /lib contains both libcrypt and libctutils:
>
> -rw-r--r-- 1 root root 20112 Aug 14 18:11 /lib/libcrypt-2.1.3.so
> lrwxrwxrwx 1 root root 17 Aug 14 18:11 /lib/libcrypt.so.1 -> libcrypt-2.1.3.so
> lrwxrwxrwx 1 root root 19 Aug 14 18:11 /lib/libctutils.so.0 -> libctutils.so.0.0.0
> -rw-r--r-- 1 root root 18252 Aug 14 18:11 /lib/libctutils.so.0.0.0
>
> but gcc can see libcrypt:
>
> $ gcc test.c -lcrypt
> $
>
> and not libctutils:
>
> $ gcc test.c -lctutils
> /usr/bin/ld: cannot find -lctutils
> collect2: ld returned 1 exit status
> $
>
>
> Similarly, /usr/lib contains both libdb1 and libdb2:
>
> -rw-r--r-- 1 root root 80582 May 1 14:27 /usr/lib/libdb1.a
> lrwxrwxrwx 1 root root 16 Aug 14 22:51 /usr/lib/libdb1.so -> /lib/libdb1.so.2
> lrwxrwxrwx 1 root root 15 Aug 14 18:10 /usr/lib/libdb2.so.2 -> libdb2.so.2.7.7
> -rw-r--r-- 1 root root 278604 Aug 14 18:10 /usr/lib/libdb2.so.2.7.7
>
> but gcc can see only libdb1 but not libdb2:
>
> $ gcc test.c -ldb1
> $ gcc test.c -ldb2
> /usr/bin/ld: cannot find -ldb2
> collect2: ld returned 1 exit status
> $
>
>
> Any ideas?
>
>
> (I've run ldconfig, but does that make any difference for compiling
> and linking (vs. linking at load time)?)
>
>
>
> Thanks,
>
> Daniel
> --
> Daniel Barclay
> dsb@smart.net
> (Hmm. A little worrisome: http://www.junkbusters.com/cgi-bin/privacy
> http://www.anonymizer.com/snoop.cgi )
>
>
> --
> Unsubscribe? mail -s unsubscribe debian-user-request@lists.debian.org < /dev/null
--
Do you really think win is easy to use?
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Juli-Manel Merino Vidal <jmmv@mail.com>
Running Debian GNU/Linux woody
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