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With 1993 and laters versions of ksh, getopts will handle both + and - if you tell it you want it to do that. Change:
while getopts :xy argumentsto:
while getopts +:xy argumentsor:
while getopts...

In simple words the error means there are two main functions since you have included file1.c twice here
gcc file1.c mathfun1.o file1.c -o file1


What you can do to solve your problem is build...

add the following
lines to the bottom of your .kshrc file in your $HOME directory:

set -o emacs
alias __A=$(print '\0020') # ^P = up = previous command
alias __B=$(print '\0016') ...