Thanks, Kevin, I can confirm suggested setup works fine so far. Thank you! I understand it, is that there's > no guarantee that this will work properly (or continue to work > properly) as the Apple toolchain continues to be updated -- e.g. a new > version of macOS / Xcode could install a version of Apple Clang that > is then incompatible with the version of libomp currently in use. In > such a case, I suspect one would need to find and reinstall libomp.
Thats understandable. On Sat, Apr 25, 2020 at 8:09 PM Kevin Ushey <kevinus...@gmail.com> wrote: > The following works for me on macOS 10.15.4 using Apple Clang + libomp > from LLVM 10 (via Homebrew). > > Install libomp from Homebrew with: > > brew install libomp > > Then, put the following in ~/.R/Makevars > > CPPFLAGS += -I/usr/local/opt/libomp/include -Xclang -fopenmp > LDFLAGS += -L/usr/local/opt/libomp/lib -lomp > > Then R will automatically enable + use OpenMP as appropriate when > installing packages from sources. > > The main danger of this approach, as I understand it, is that there's > no guarantee that this will work properly (or continue to work > properly) as the Apple toolchain continues to be updated -- e.g. a new > version of macOS / Xcode could install a version of Apple Clang that > is then incompatible with the version of libomp currently in use. In > such a case, I suspect one would need to find and reinstall libomp. > > In theory, this could be alleviated by ensuring all users download and > use the same version of Xcode as is being used by the macOS build > machine (Xcode 10.1), but in practice users will likely just be using > the "default" set of command line tools that comes with their version > of macOS. > > Cunningham's law will hopefully ensure someone else will chime in if > I've got something wrong :-) > > Best, > Kevin > > On Sat, Apr 25, 2020 at 8:29 AM Wright, Erik Scott <eswri...@pitt.edu> > wrote: > > > > I second this request. Dropping OpenMP support in R v4.0 on Mac is > unfortunate. My R package is highly parallelized via OpenMP, and many of > my end-users take advantage of the excellent speedups. It would be much > appreciated if user-level instructions could be provided for how to enable > OpenMP support on the Mac. > > > > Thanks, > > Erik > > > > > > > On Apr 23, 2020, at 7:08 AM, Dmitriy Selivanov < > selivanov.dmit...@gmail.com> wrote: > > > > > > Hi Simon, > > > > > > Just wanted follow up on this topic. > > > > > > It would be very helpful if you can provide some guide on > > > > https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmac.r-project.org%2F&data=02%7C01%7Ceswright%40pitt.edu%7C65097590dea4453ab8cf08d7e776b868%7C9ef9f489e0a04eeb87cc3a526112fd0d%7C1%7C0%7C637232369415901734&sdata=qlhXuEubgD6PNmkbD%2BWQy5OI9X%2BGjxSYHMNjA%2BQHZzI%3D&reserved=0 > < > https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmac.r-project.org%2F&data=02%7C01%7Ceswright%40pitt.edu%7C65097590dea4453ab8cf08d7e776b868%7C9ef9f489e0a04eeb87cc3a526112fd0d%7C1%7C0%7C637232369415911728&sdata=5XR5LJuAKu4%2B3%2FUHsWVPMlyXTLY87P6OF%2FP%2FTZt1W8Y%3D&reserved=0> > for those users > > > (advanced?) and developers who wants to be able to use OpenMP on mac. > From > > > what I've understood from this mail thread the easiest way is to > install R > > > from homebrew as it is built with non-standard Apple toolchain. > > > Apart from that you've mentioned you may consider to bundle binary > iomp > > > with R installation, but "it would be on the package author to make > sure > > > that the way the package operates is compatible with that binary". > Could > > > you please elaborate on that? > > > > > > I believe I'm not alone who would like to be able to use OpenMP on mac > and > > > "official" guidance would be very helpful. > > > > > > -- > > > Regards > > > Dmitriy Selivanov > > > > > > [[alternative HTML version deleted]] > > > > > > _______________________________________________ > > > R-SIG-Mac mailing list > > > R-SIG-Mac@r-project.org > > > > https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstat.ethz.ch%2Fmailman%2Flistinfo%2Fr-sig-mac&data=02%7C01%7Ceswright%40pitt.edu%7C65097590dea4453ab8cf08d7e776b868%7C9ef9f489e0a04eeb87cc3a526112fd0d%7C1%7C0%7C637232369415911728&sdata=yAu4MKX2Ka5yEaoq51byWJSkbL%2FpO1HvtUsI%2BQXmtJQ%3D&reserved=0 > > > > _______________________________________________ > > R-SIG-Mac mailing list > > R-SIG-Mac@r-project.org > > https://stat.ethz.ch/mailman/listinfo/r-sig-mac > -- Regards Dmitriy Selivanov [[alternative HTML version deleted]] _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac