[llvm-bugs] [Bug 36750] Meyers' singleton does not work with [[gnu::pure]] and -O1 to -O3

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36750

Eli Friedman <efriedma at codeaurora.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|INVALID                     |---
             Status|RESOLVED                    |REOPENED

--- Comment #7 from Eli Friedman <efriedma at codeaurora.org> ---
s_myClass is a global variable, and myClass() modifies it, so it's not pure. 
At least, that's how it works from LLVM's perspective.

If that doesn't actually match gcc's behavior, we could possibly change LLVM, I
guess?  But we'd need more evidence gcc actually implements a different rule.

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