g++ Linker Order and Optimization?

[acppdummy]

I have been using NetBeans IDE to build my program with its auto generated make file. Then I noticed the binary file generated depends on the order of linking. For example

g++ -static -o myprogram a.o b.o c.o d.o e.o -la -lb -lc

,

g++ -static -o myprogram a.o b.o c.o d.o e.o -lb -la -lc

(change order of libraries), and

g++ -static -o myprogram c.o d.o e.o a.o b.o -la -lb -lc

(change order of object files) all produce different binaries, even though the libraries and object files are all identical in each of the three cases.

So here are my questions:
How does NetBeans decide the order of linking and how to change it?

Does the order of linking affect performance and if so how to optimize it?

Thank you!