We should perhaps reopen this in light of PR21635 (or consider some variant of
it). The problem, as pointed out in the bug report, is that libstdc++
implements std::X in terms of __builtin_X:
inline float
exp(float __x)
{ return __builtin_expf(__x); }
and these C++ functions are *required* to follow the same math error handling
protocol as the underlying C functions. So we actually don't have much of a
choice here (at least for those functions used to implement libstdc++) as far
as I can tell. As a result, this seems like the right approach after all
(although this is somewhat unfortunate).
http://reviews.llvm.org/D3806
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