Memory corruption (undefined behaviour) after updating from 0.9.5.x -> 0.9.6.x

[therocode]

I am not entirely sure if this is a bug in GLM or not, but I am not sure what else, so apologies if it turns out not to be.

I have been using glm in my game that's been developed for over a year and it has been working fine with no errors printed in valgrind or anything such. Today, after updating glm from 0.9.5.x to 0.9.6.x I started to get a peculiar error in my game. All entities spawn in one place, and whenever I touch the ground the game crashes with an invalid read of memory.
The specifics around the error probably doesn't say much but valgrind just says that there is an invalid read on an object that is suddenly random memory.

If I check out older versions of my game (even several months back) the exact error persists even though it was never apparent before.

Using git, I bisected the glm source code and was able to find the exact commit after which I start to experience these issues. However I am not initiated in the glm source code so I cannot tell if it does anything that could be related to it.

Last good commit: a2a6037 - (2 months ago) More std trivial experiments #263
First bad commit: 838bdee - (10 weeks ago) All vec types are copyable #263
Diff: http://dpaste.com/1X55MGZ

I tried a few times switching between these commits and it is definitely the triggering factor for my error symptoms.

To me this sounds like either a bug in GLM, or a really really well-hidden bug in my code which only surfaced with this particular commit.

What do you think, is it possible that the commit contain actual problems? Are there more ways that I can provide useful information on the issue?

Oh, and my compiler is clang 3.5.1 on linux.

[therocode]

I now tried with g++ 4.9.2 and the result is the same.

[Groovounet]

I couldn't figure out what was the exact issue so I just added a copy constructor and assignment operator of the exact same type which should match the last good commit.

This fix has been done on GLM 0.9.6 branch for GLM 0.9.6.2 release.

Thanks for contributing,
Christophe