[MITgcm-devel] genmake2 and makedepend

[Martin Losch]

Hi there,
my version of Murphy's law: Whenever you want to show how great everything is, it turns against you and does not work.

I was trying to show to my group in a presentation, how makefiles are generated by genmake2 and how you compile the model etc, when "make depend" returned errors that it cannot find "netcdf.inc". This happened after the genmake_tnc.F test passed. I used darwin_amd64_gfortran with OS X 10.8 (mountain lion).

The problem is that (on my PowerBook), /usr/bin/cpp finds files in /usr/local/include by default, and gfortran finds libraries in /usr/local/lib by default (that's where my netcdf installation is), so that the test passes without problems (-DHAVE_NETCDF), and more importantly without INCLUDES or INCLUDEPATH being set (I have NETCDF_ROOT unset by default). However, when make depend tries to build the dependencies, the include files are no longer found because apparently, my makedepend (/opt/X11/bin/makedepend) does not search /usr/local/include by default.

I can easily fix this by specifying a proper NETCDF_ROOT (=/usr/local), but it shows that the netcdf test is not fool-proof. Do you have a suggestion how we can improve the test? E.g. tell cpp not to search anywhere that is not explicitly specified in the INCLUDEPATH?

Martin