Added a way of setting an implicit set to the compiler options.

[AlvaroBarua]

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[AlvaroBarua]

@googlebot I signed it!

[zoddicus]

I just noticed that this never was reviewed.

@dneto0 when you get back to the office can you take a look at it?

[AlvaroBarua]

Hi, just remembered I added this pull request. I was wondering if it was reviewed?