The difference is that this login shell will be installed on 600 odd servers with different operating systems and I don't want to manage compiling C code across different operating systems.

:) You'll notice my question came before my suggestion, it wasn't about my suggestion

Let me elaborate, what is the difference between using a login vs a non-login shell? What effect does it have upon the execution of a program? Does it set some variables?

I doubt the only effect is a dash in ARGV

You could probably examine some perlvar or some POSIX call, but you'd have to know more about what su does -- I don't know too much about su.

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