Fix ppc64le longdouble type conversion

[mraspaud]

This PR fixes the conversion to longdouble. The problem lies in the erroneous bit-size of the components by hdf5, hence requiring some hardcoding for longdoubles (double double implementation in this case).

Signed-off-by: Martin Raspaud martin.raspaud@smhi.se

[tacaswell]

I could be convinced to leave 2.7 as is (if it is currently passing in the debian builds) and do this in a 2.7.1 or to merge this for 2.7.

@epourmal Can you shed any light on this from the hdf5 group side? Should we send an email the the mailing list?

[mraspaud]

@tacaswell I would go for the next release, and leave 2.7 as is. Unless @ghisvail has time to test it ?

[aragilar]

@ghisvail Are you able to test this so we can get this into 2.7.1?

[ghisvail]

I will set some time aside this week to test 2.7 with this fix. Stay tuned.

[ghisvail]

2.7.0 is out on Debian. Most architectures built successfully, besides powerpc

[tacaswell]

@mraspaud @ghisvail What is the state of this?

[ghisvail]

@tacaswell Just make a release and we'll iterate on the feedback from the builders. I have got no time to do further testing.

[mraspaud]

It was tested by hand on the concerned architectures, so I'm pretty confident it should be safe to merge.