Linker fails with new compilers on mac about mpi-feedstock HOT 4 CLOSED

If you are only building for yourself, you should be able to build with:

export CONDA_BUILD_SYSROOT=/

but there's more work to do if you are attempting to build redistributable packages. The conda compilers use open source llvm 7, which doesn't yet support Apple's .tbd stub format, adopted in more recent SDKs. To work around this, you need to:

1. download an old mac sdk (10.9 or 10.10, I think)
2. tell the compilers to use this by setting CONDA_BUILD_SYSROOT to point to it

The conda-forge CI setup does this here.

from mpi-feedstock.

Well, it does fix it:-) But it seems like an ugly hack for someone that simply wants to use mpi from conda to work locally?

from mpi-feedstock.

There's an ongoing discussion about making the conda compilers work by default without any help. Apple makes it surprisingly tricky by changing things on almost every release. The current behavior should indeed work by default once llvm 8 is out with support for TAPI .tbd stubs that Apple started using in their SDKs but didn't open source promptly.

I may look into having openmpi-mpicc set CONDA_BUILD_SYSROOT=/ by default on mac because of this as a possible experiment, since that ought to work better.

from mpi-feedstock.

Close due to inactivity. Feel free to reopen if needed.

from mpi-feedstock.