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One day I will figure out how to turn off some of the 700 warnings that the compiler gives me, such that the warnings are useful.
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Sometimes there are many warnings you don't care about after an initial warning that matters caused by an user mistake or code bug. Other than that case, you should check all warnings. Some Info messages also have very important information.
Once you're satisfied that a particular warning or a particular class of warnings does not matter, you can hide that warning or similar warnings by right clicking the message and choosing "Suppress". For subsequent compilations, the messages won't be cluttered by the messages you've already reviewed. The suppressed messages are still available in case you do want to see them again.
You can also control the number of synthesis messages given using "HDL Message Level" on the Analysis & Synthesis Settings page of the Settings dialog box.
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