STINNER Victor added the comment:

test_strtod fails on FreeBSD using clang 4.0, but pass using clang 3.8.

Links:

* https://gcc.gnu.org/wiki/FloatingPointMath
* https://gcc.gnu.org/wiki/Math_Optimization_Flags
* ICC fp-model: https://software.intel.com/en-us/node/682946

GCC options:

* -ffp-contract=off / -ffp-contract=fast
* -fp-model (not supported by clang)
* -mfpmath=sse: no effect on Clang, it's already the default and -mfpmath=387 
is not supported on x86_64 ISA
* -ffast-math
* -fexcess-precision=standard: not supported by clang

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<http://bugs.python.org/issue30104>
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