Homebrew formula

[zbeekman]

Hi,

I'm interested in creating a homebrew formula for chrono. I think I'll need to turn the demos off (since homebrew doesn't like app bundles or guis in homebrew-core formulae) but I wanted to ensure that:

1. I'm building a relatively full featured chrono
2. Idiosyncrasies/issues that may prevent addition to homebrew can be addressed

Concerning point 1 above: Right now I'm adding the following CMake flags to Homebrew's defaults:

-DBUILD_DEMOS=OFF
-DCMAKE_SHARED_LINKER_FLAGS=-lomp
-DENABLE_HDF5=ON
-DENABLE_MODULE_IRRLICHT=ON
-DENABLE_MODULE_POSTPROCESS=ON
-DENABLE_MODULE_VEHICLE=ON
-DENABLE_MODULE_PYTHON=ON
-DENABLE_OPENMP=ON

I tried to also enable OpenCascade but CMake failed to find the headers/libraries... this is fine, I can manually add them to enable OpenCascade as well, most likely. Are there any other features that I should be enabling?

My biggest questions are about parallelism: Obviously CUDA on macOS is more or less a non-starter, but is it possible to enable MPI based parallelism without thrust & blaze?

Concerning point 2 above: CMake seems to figure out where libomp.dylib is, but is not passing it to the linker when building shared libraries. This seems to me like it is a bug in the build system, however, I can find the brewed libomp and pass in libomp.dylib explicitly (or at least ensure that the linker search path has libomp in it and pass -lomp). Has anyone tried to look at this in the past and get the linker of macOS to find brewed libomp without additional input from the user?

[zbeekman]

Just FYI, without specifying anything special beyond -DENABLE_OPENMP=ON CMake finds libomp but the build system does not pass it to the linker when building shared libraries:

 OpenMP_CXX_FLAGS                 -Xclang -fopenmp
 OpenMP_CXX_LIB_NAMES             libomp
 OpenMP_C_FLAGS                   -Xclang -fopenmp
 OpenMP_C_LIB_NAMES               libomp
 OpenMP_libomp_LIBRARY            /usr/local/lib/libomp.dylib

[zbeekman]

FWIW, it seems that building with this combination of flags, including OpenCascade is not working even when setting the OpenCascade root, lib and include dirs as the documentation suggests. I'm removing opencascade support in the formula for now

[thepianoboy]

Is the development of this formula still active? If not, let's close the issue.

[scpeters]

I am experimenting with a formula in the following tap: https://github.com/osrf/homebrew-simulation/pull/2068