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By default, the compiler places in the object file the names of the C
libraries that correspond to the memory model and floating-point options
that were selected.  The Watcom Linker uses these library names to select
the libraries required to link the application.  If you use the "zl" option,
the library names will not be included in the generated object file.
The compiler may generate external references for library code that
conveniently cause the linker to link in different code.  One such case is:
if you have any functions that pass or return floating-point values (i.e.,
float or double), the compiler will insert an external reference that will
cause the floating-point formatting routines to be included in the
executable.  The "zl" option will disable these external references.

Use this option when you wish to create a library of object modules which do
not contain Watcom C/C++ library name references.