sqrtl behavior inconsistent with sqrt and sqrtf

[airplanemath]

Compiling and running the attached program with the command line below
produces the output below:
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$ gcc -O0 -Og test_sqrt.c -o test_sqrt && ./test_sqrt
Long double: -inf -inf
Double:      -inf -nan
Float:       -inf -nan

I suspect the behavior for long double should be the same as for double
and float (sqrt(-inf) = nan), but I'm not sure where to change that.
I'm running a snapshot of Cygwin 3.2.0, if that's important.