Compile 64bit .so file on Solaris 10

I am porting an old Oracle PL/SQL application from 32bit Oracle 8i on Solaris8 to Oracle10 on Solaris 10.  

The PL/SQL calls an external procedure stored in a C library .so file. On Oracle10/Solaris 10 it gives the error  

wrong ELF class: ELFCLASS32.  

So I assume I need to create a 64 bit version.  

As far as I can tell the shared library was previously compiled using  

cc -G -dy mytest.c -o mytest.so  

but this seems to still create a 32 bit version.

How do I compile to 64 bit?        

John Dunn

Product Consultant

Sefas Innovation Limited

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