On Thu, Oct 31, 2013 at 1:14 PM, Daniel Roe <daniel.r.roe.gmail.com> wrote:
> Hi All,
>
> The NetCDF in GIT master has been updated from version 3 (several
> years out of date) to version 4. The build is completely backwards
> compatible, and no additional features/requirements (such as using the
> HDF5 libraries) have been added.
>
> After version 4.1 NetCDF has been split into separate interfaces for C
> and Fortran. Because of this, the NetCDF build process is now slightly
> different. Basically the Fortran interface requires that the C
> interface be compiled beforehand, so now both interfaces are
> configured and compiled one after the other during Amber's main
> configure. This increases initial configure time, but subsequent
> builds are faster since the NetCDF configure/build step can be
> skipped. The configure script is smart enough to recognize when the
> interface needs to be rebuilt (such as when switching compiler types
> etc). The '--with-netcdf' keyword has been re-enabled as well so you
> can specify a separate NetCDF build.
>
> NetCDF now uses an automake build which has some wrinkles when
> combined with versioning control software such as GIT. Basically when
> you switch branches, file timestamps are reset. This leads to the
> automake framework thinking certain files need to be rebuilt when they
> really dont. I've added a script that updates certain critical file
> timestamps if necessary to prevent this, so you may see this during
> configure:
>
> Warning: NetCDF build timestamps need to be updated. This should
> ONLY happen during development after switching branches
> in GIT. Fixing timestamps (this will take about 7 seconds).
>
> This will ONLY be necessary after you switch branches.
A minor clarification here. This will only be necessary when you switch
from a branch with the old NetCDF to a branch with the new NetCDF. Once
you merge the master branch into your other development branches, this
should never occur again.
Thanks Dan for all the hard work!
Jason
--
Jason M. Swails
BioMaPS,
Rutgers University
Postdoctoral Researcher
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Received on Thu Oct 31 2013 - 12:00:03 PDT
