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From "Christiaan Lamprecht" <christiaanw...@googlemail.com>
Subject Linking to a Shared Object
Date Thu, 09 Nov 2006 15:17:55 GMT
Hi all,

I'm trying to install mod_assl (a module I wrote) in Apache as an
DSO object. This works fine but I now need mod_assl to use functions
in assl.c (also my code), and these assl.c functions should also be
available to external programs such as application.c (which has it's
own main method).

I have written a module (mod_assl.c) which uses functions in assl.c
(there's also an assl.h - both mine). I've also written an application
application.c which also calls functions in assl.c. They are all in
the same directory $HOME/ApacheSource/httpd-2.2.3/modules/ssl/ (in the
source tree)

The problem:
I compiled the assl.c code:
libtool --mode=compile gcc -fPIC -DSHARED_MODULE -D_LARGEFILE64_SOURCE
-I$HOME/ApacheSource/httpd-2.2.3/include/
-I$HOME/ApacheSource/httpd-2.2.3/srclib/apr/include/
-I$HOME/ApacheSource/httpd-2.2.3/srclib/apr-util/include/
-I$HOME/ApacheSource/httpd-2.2.3/server/mpm/prefork/
-I$HOME/ApacheSource/httpd-2.2.3/os/unix/ -c assl.c

which creates:
assl.o
assl.lo

I then compiled my mod_ssl.c module into Apache2 (note assl.lo at the end):
./sbin/apxs -i -a -c
../ApacheSource/httpd-2.2.3/modules/ssl/mod_assl.c
../ApacheSource/httpd-2.2.3/modules/ssl/assl.lo

to create: (in $HOME/Apache2/libexec)
mod_assl.so

Then compiled the application.c: (probably don't need all the -I)
libtool --mode=compile gcc -fPIC -DSHARED_MODULE -D_LARGEFILE64_SOURCE
-I$HOME/ApacheSource/httpd-2.2.3/include/
-I$HOME/ApacheSource/httpd-2.2.3/srclib/apr/include/
-I$HOME/ApacheSource/httpd-2.2.3/srclib/apr-util/include/
-I$HOME/ApacheSource/httpd-2.2.3/server/mpm/prefork/
-I$HOME/ApacheSource/httpd-2.2.3/os/unix/ -c application.c

which creates:
application.o
application.lo

Now I need to create an executable (test):
libtool --mode=link gcc -g -O -o test application.lo
$HOME/Apache2/libexec/mod_assl.so $HOME/Apache2/lib/libapr-1.so
$HOME/Apache2/lib/libaprutil-1.so
$HOME/OpenSSLsource/openssl-0.9.8d/libssl.a
$HOME/OpenSSLsource/openssl-0.9.8d/libcrypto.a -rpath
$HOME/Apache2/libexec

But I get:
gcc -g -O -o test .libs/application.o
$HOME/Apache2/libexec/mod_assl.so $HOME/Apache2/lib/libapr-1.so
$HOME/Apache2/lib/libaprutil-1.so
$HOME/OpenSSLsource/openssl-0.9.8d/libssl.a
$HOME/OpenSSLsource/openssl-0.9.8d/libcrypto.a  -Wl,--rpath
-Wl,$HOME/Apache2/libexec
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ap_log_rerror'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ssl_var_lookup'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ssl_expr_exec'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ssl_module'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to
`ap_hook_pre_connection'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ssl_expr_comp'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ap_log_error'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to
`ap_hook_access_checker'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ap_hook_pre_config'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ssl_log_ssl_error'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ap_log_cerror'
$HOME/Apache2/libexec/mod_assl.so: undefined reference to `ssl_io_buffer_fill'
collect2: ld returned 1 exit status

Which library am I missing? Surely it should have complained when I
created mod_assl.so in the first place?

I've tried MANY things but nothing seems to work. Anyone see a
problem? Is this the right way to approach the problem of sharing a
module?

Many many thanks in advance
Christiaan

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