a demo to show how to link a project w/ files which have same name and functions have same name

it is tested in Macbook Pro.
for the linux enviroment, the command ld -r -exported_symbols_list exported_sym.list ${OBJECTS} -o ${TARGET}.o should be checked,
-exported_symbols_list should be replaced by --retain-symbols-file.

check also in my blog:
link same name functions

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make clean
make