[Releasing] Can we do a last minute upgrade of the MinGW toolchain?

[Koehne Kai]

Hi there,

Both the CI system and the build machines for 5.0.1 right now use MinGW-builds x32-4.7.2-release-posix-sjlj-rev1.7z as toolchain. However, since we originally settled for rev1 the toolchain got a couple of updates, and now is on -rev8. ChangeLog:

http://sourceforge.net/projects/mingwbuilds/files/host-windows/releases/4.7.2/

I'd especially like to see the fixes for the gdb wrapper being shipped. There are also other improvements where I cannot really judge the criticality, e.g. "Fixed some corner cases for pow(): -x ^ non-int" , which I understood break some autotests, and potentially other code too.

So I'd like to propose doing an upgrade to latest rev8 of the toolchain both in the CI system and the build machines. I compiled all of Qt successfully with it locally. I'd then push an update to the documentation + update the wiki page.

Regards

Kai