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[FYI] Reversion of the fix for libstdc++/19495


Hi,

sadly, I'm going to revert from mainline the fix for this basic_string
issue. In principle it's ok, decently clean and safe wrt the library ABI
proper. However, it's *not* 100% safe wrt interoperability between
object modules compiled with different v6 releases, because the memory
allocation strategy changes (considering all the possible cases,
inlining/not inlining, also types != char, wchar_t, etc.)

I will add it to the reference-counted base class of v7 basic_string.

Paolo.


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