Philipp, the instructions (if really insist on using Xcode 16.3 - not recommended) are here: https://mac.r-project.org/openmp/ relevant part quoted:
"Note: If you are using CRAN R binary and there is a potential conflict between its run-time and your run-time (which is generally a bad idea!) then you can force the use of your binary by replacing -lomp above with /usr/local/lib/libomp.dylib (note that lack of -l!)." i.e., you set PKG_LIBS=/usr/local/lib/libomp.dylib when compiling data.table. Note, however that you then have to re-compile *all* packages that may use OpenMP as your result will be incompatible with the CRAN binaries. Cheers, Simon > On May 10, 2025, at 1:10 AM, Philipp Schneider via R-SIG-Mac > <r-sig-mac@r-project.org> wrote: > > Hey, > > I'm a bit late to the party, but I was just made aware of this thread in my > GitHub thread (https://github.com/Rdatatable/data.table/issues/6949), which > is very related to the one mentioned here. > > To make it as short as possible, I am unable to build data.table from source > since Xcode 16.3, which expected reading this thread. I thought I was using > the OpenMP from LLVM 19.1.0, which should work again with Xcode 16.3. While > doing some research I stumbled over an old R-help thread by me that states > that R is always using the libomp.dylib bundled with R > (/Library/Frameworks/R.framework/Versions/4.x-arm64/Resources/lib/libomp.dylib). > Here's the R-help thread just in case: > https://stat.ethz.ch/pipermail/r-help/2024-April/479157.html. Turns out I > never really solved this issue since other stuff came up, but now this haunts > me again :). I always untar the .tar.gz archive from > https://mac.r-project.org/openmp/ as mentioned there and then use a > ~/.R/Makevars also as mentioned there, but how do I actually tell R to use > the libomp.dylib in /usr/local/lib and not > /Library/Frameworks/R.framework/Versions/4.x-arm64/Resources/lib/, when > building a package from source? > > Thank in advance, > Philipp > > _______________________________________________ > R-SIG-Mac mailing list > R-SIG-Mac@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-mac > _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac
