cmake: Increase warning level on MSVC
authorManuel Nickschas <sputnick@quassel-irc.org>
Sun, 18 Nov 2018 18:12:10 +0000 (19:12 +0100)
committerManuel Nickschas <sputnick@quassel-irc.org>
Sun, 18 Nov 2018 23:59:46 +0000 (00:59 +0100)
By default, CMake sets /W3, which basically outputs nothing.
The next level /W4 is more useful, but causes lots of false positives.
So let's use /W4 and silence stuff that is annoying and useless.


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