I built and test hdf5-1.8.10 on alpha cygwin64.

The first failures are on long double conversion,
but the output is a bit strange:

Testing hard signed char -> long double conversions *FAILED*
    elmt 0:
src = 01 1 dst = ff 80 7f 40 3f 20 3f ff 80 00 00 00 00 00 00 00 1.000000 ans = 00 00 00 00 00 00 3f ff 80 00 00 00 00 00 00 00 1.000000

[cut]
    elmt 87:
src = 00 00 0f ff ff ff ff ff 17592186044415 dst = ff ff 80 00 00 00 40 2a ff ff ff ff ff f0 00 00 17592186044415.000000 ans = 00 00 00 00 00 00 40 2a ff ff ff ff ff f0 00 00 17592186044415.000000
    maximum failures reached, aborting test...
(dst is library's conversion output. ans is compiler's conversion output.)

any idea ?
Marco

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