When Eclipse stops responding and displays an error message:
An internal error occurred during: "Building workspace". GC overhead limit exceeded
or any other related to memory limits, like:
PermGen space limit exceeded
It means that the oparation performed was memory-consuming (like building big workspace project) and Java was out of memory. It often happens on 64-bit machines.
Then you should increase the memory allocation for IDE. Do it by editing eclipse.ini file (find it in your eclipse folder). you can increase memory allocation by editing values in those two lines:
by increasing it for example to:
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