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(nasm.info)Section 8.2.6

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8.2.6. Generating the Library File
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   Having written some code modules and assembled them to `.o' files,
you then generate your shared library with a command such as

     ld -shared -o library.so module1.o module2.o       # for ELF
     ld -Bshareable -o library.so module1.o module2.o   # for BSD

   For ELF, if your shared library is going to reside in system
directories such as `/usr/lib' or `/lib', it is usually worth using the
`-soname' flag to the linker, to store the final library file name,
with a version number, into the library:

     ld -shared -soname library.so.1 -o library.so.1.2 *.o

   You would then copy `library.so.1.2' into the library directory, and
create `library.so.1' as a symbolic link to it.