Avoid using xcrun on non-osx platforms

[pramodk]

fixes #709

[ikitayama]

What's the best way of pulling your fix to my local repo, considering submodules under it?

[pramodk]

@ikitayama : this fix was done in neuron so we don't news to update submodule. You could have changed the branch from where I have created PR (i.e. pramodk/xcrun-fix). As this is merged into master, just do git pull to get latest master.

[ikitayama]

I've re-ran CMake and built the code, but I still see the error.

[ikitayama]

Am I supposed to use nrnivmodl-core, instead of nrnivmodl?

[pramodk]

@ikitayama : did you run cmake .. <params> command after pulling latest changes? On my local machine, the bin/nrnivmodl has following:

if which xcrun; then
    #export SDKROOT=`xcrun --sdk macosx --show-sdk-path`
    #export MACOSX_DEPLOYMENT_TARGET=""
    if [ -z "${MACOSX_DEPLOYMENT_TARGET}" ]; then
        unset MACOSX_DEPLOYMENT_TARGET
    fi
fi

Am I supposed to use nrnivmodl-core, instead of nrnivmodl?

For NEURON, we still use nrnivmodl. We are working another PR to remove need of nrnivmodl-core but this will need another day to review and merge.

[ikitayama]

@pramodk I do too, but nrnivmodl keeps trying to execute xcrun although which xcrun leaves echo $? 1.

[pramodk]

@ikitayama : if xcrun statements are commented out with #, I don't understand why the should be executed. Have you installed it with make install?