[MITgcm-support] Link problem on OSX

[Ruth Musgrave]

Hi 

after some OS updates I suddenly found myself unable to compile MITgcm on my laptop. The initial issue was a problem with XCode, which I have resolved by upgrading my entire OS to Mojave, and doing all the updates. I am now running the latest, and undoubtably greatest, OSX.

However, I still cannot compile MITgcm. The issue seems to be in linking, with the following error in the last step:

ld: 32-bit RIP relative reference out of range (2154362563 max is +/-2GB): from _impldiff_ (0x10021DAF0) to _loctr.4787 (0x1808B09E0) in '_impldiff_' from impldiff.o for architecture x86_64

I have seen errors like this before and solved them with flags like -mcmodel=medium etc., but this time it doesn't work.

I followed with great interest this thread:

http://mailman.mitgcm.org/pipermail/mitgcm-support/2013-December/008687.html <http://mailman.mitgcm.org/pipermail/mitgcm-support/2013-December/008687.html>

but it is left with a cliffhanger! I did verify that my compilers are all 64 bit. 

I would be very very grateful for any suggestions, as I am entirely out of ideas and desperate to run some simulations. I am using the build options in darwin_amd64_gfortran_netcdf.

Thank you
Ruth
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