Does anybody know how to make Geany's compiler more 'strict'? By 'strict' i mean that Geany has to give warnings for silly mistakes, like opening same varible twice or trying to access out of bound element in array.

And if you also know, is there any way to do it without downloading anything, like plugins, because when i will go to some contest which i won't have access for my laptop, i probably won't have access to download anything. If needed i can switch to another code editor which is in IOI whitelist.