Compile PHP extension on 64bit debian installation to 32bit PHP

I am trying to compile a PHP extension for a 32 bit PHP installation on a 64 bit system. However, when restarting apache, the following warning appears:

Warning: PHP Startup: Unable to load dynamic library '/opt/lampp/lib/php/extensions/no-debug-non-zts-20090626/spotify.so' - /opt/lampp/lib/php/extensions/no-debug-non-zts-20090626/spotify.so: wrong ELF class: ELFCLASS64 in Unknown on line 0

      

        
        
        
      

    

I will compile everything using this command:

/opt/lampp/bin/phpize; CFLAGS=-m32 CPPFLAGS=-m32 CCASFLAGS=-m32 ./configure --enable-spotify --with-php-config=/opt/lampp/bin/php-config; make && make install

      

        
        
        
      

    

The flags need to make sure they compile to 32 bits. I have installed gcc-multilib

andg++-multilib

When compilation is done (this log: http://pastebin.com/MqgGgyzv ) I execute the following command:

file /opt/lampp/lib/php/extensions/no-debug-non-zts-20090626/spotify.so

      

        
        
        
      

    

and it returns

/opt/lampp/lib/php/extensions/no-debug-non-zts-20090626/spotify.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, not stripped

      

        
        
        
      

    

So it clearly doesn't compile it correctly, but I can't see what I am doing wrong.