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From Dan Jacobowitz <>
Subject Re: DSO issue
Date Mon, 07 Sep 1998 17:45:51 GMT
On Mon, Sep 07, 1998 at 09:32:18AM +0200, Ralf S. Engelschall wrote:
> Building works on most platforms because there the DBM stuff
> is in libc which is always available to DSOs ;-). The SHARED_CHAIN is on
> 1.3.2-dev. Sorry, it was added after 1.3.1. 

[background for crosspost to libc-alpha]
I am trying to build Apache under glibc 2.1 with db.h and -ldb.  I'm
encountering a problem with loaded modules not being able to see
symbols unless explicitly linked against -ldb, something not necessary
on i386 and glibc 2.0.7.

I just want to add one more question to this...

On Debian 2.0 (glibc 2.0.7), the dbm stuff is not in libc. 
mod_auth_dbm is linked only against libc.  Apache, however, is linked
against libdb.  This works.  On powerpc and glibc 2.0.95, the situation
is similar: dbm in libdb, apache linked against -ldb, mod_auth_dbm
linked only against libdb.  This fails.

Oddly, mod_auth_db (which requires dbopen, also from libdb) loads fine. 

It looks like some kind of linker confusion.  Ahah - the missing
symbols from mod_auth_dbm are strong symbols and dbopen is weak.  Are
we sufficiently confused yet?  I could understand the other way around,
but it seems that only the weakly linked symbols are propogating to
dlopen()'d modules.

Any and all thoughts appreciated.


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