cobc instead of cobcrun

[James K. Lowden]

I made an "interesting " mistake today that took some time to resolve,
as so often happens.  

After building my program, converting src/foo.cbl to lib/foo.so, I did
this

        $ cobc lib/foo.so

instead of 

        $cobcrun lib/foo

The result?  No error message, but a new file, ./foo.so, with many
missing symbols.  

I suspect the technical answer is that a single .so file is valid input
to the toolchain invoked by cobc.  I'd accept that, maybe, if the
result was not broken by every measure that a user would apply: 

1.  no message
2.  output that does basically nothing

I suggest that if the input is a single .so, the compiler should reject
it as an error.  I can think of no case in which that input would
produce a useful output.  

--jkl