Update of Mac installation information for Monterey (v 12)

[markdanese]

I had to do a fresh install on a new M1 Mac running Monterey (v 12.0.1) today. I followed the instructions at https://github.com/Rdatatable/data.table/wiki/Installation (which were really helpful). However, I couldn't get data.table to install from source or recognize OpenMP.

It turns out that in Step 2, Option 1 (LLVM) the Makevars file specifications don't work with the current version of the Mac OS (Monterey 12.0.1) and the latest version of Homebrew (3.3.5) which installs into a new location. Below is the code that worked for me. I installed from source without a problem and OpenMP is recognized. I had to install gettext (brew install gettext). I had also installed gcc via Homebrew also, but I don't know if that was required. After this, I get OpenMP working with 5 threads, which is correct.

Hopefully this will be helpful to someone. Note that, despite the success with data.table, the fst package doesn't recognize OpenMP even after installing from source, so I can't guarantee that the code below will solve all related issues. I will file an issue in the fst repo separately.

HOMEBREW_LOC=/opt/homebrew
LLVM_LOC=$(HOMEBREW_LOC)/opt/llvm
CC=$(LLVM_LOC)/bin/clang -fopenmp
CXX=$(LLVM_LOC)/bin/clang++ -fopenmp
# -O3 should be faster than -O2 (default) level optimisation ..
CFLAGS=-g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe
CXXFLAGS=-g -O3 -Wall -pedantic -std=c++11 -mtune=native -pipe
LDFLAGS=-L$(HOMEBREW_LOC)/opt/gettext/lib -L$(LLVM_LOC)/lib -Wl,-rpath,$(LLVM_LOC)/lib
CPPFLAGS=-I$(HOMEBREW_LOC)/opt/gettext/include -I$(LLVM_LOC)/include

[avimallu]

You can make the edit on the data.table wiki yourself to help other people like yourself!

Not sure if this will work on your system - but these flags made even packages like fst that seem to rely on some fortran elements work for me on OpenMP on a Linux system:

CC = /usr/bin/gcc64
CXX = /usr/bin/g++
CXX11 = /usr/bin/g++
CXX14= /usr/bin/g++
CXX17= /usr/bin/g++
CXX1X= /usr/bin/g++
FC = /usr/bin/gfortran48
SHLIB_OPENMP_CFLAGS = -fopenmp
SHLIB_OPENMP_CXXFLAGS= -fopenmp
SHLIB_OPENMP_FCFLAGS= -fopenmp
SHLIB_OPENMP_FFLAGS= -fopenmp

You should be able to modify suitably to get it to work on Mac.

[George9000]

I too installed on an M1 mac with Monterey.

see https://mac.r-project.org/openmp/
slightly modified instructions

mkdir ~/Documents/openmp
mkdir ~/Documents/openmp/usr
mkdir ~/Documents/openmp/usr/local

cd ~/Documents/openmp
curl -O https://mac.r-project.org/openmp/openmp-13.0.0-darwin21-Release.tar.gz
tar fvxz openmp-13.0.0-darwin21-Release.tar.gz -C .  # note the period for current directory

cd /usr/local
sudo mkdir lib
sudo mkdir include
cd lib
sudo cp /Users/foo/Documents/openmp/usr/local/lib/libomp.dylib .

cd ../include
sudo cp /Users/foo/Documents/openmp/usr/local/include/* .

Then....
make a ~/.R/Makevars as follows

CFLAGS=-g -O3 -Wall -pedantic -std=gnu99 -mtune=native -pipe
CXXFLAGS=-g -O3 -Wall -pedantic -std=c++11 -mtune=native -pipe
CPPFLAGS += -Xclang -fopenmp -I/usr/local/include
LDFLAGS += -lomp -L/usr/local/lib

With that data.table built and gave 5 threads when loaded.

For my builds I like to git clone into a directory and then run the R CMD variations

git clone git@github.com:Rdatatable/data.table.git
R CMD build data.table
R CMD remove data.table # in case there is an existing old version
R CMD install data.table_1.14.3.tar.gz

[fox34]

I've verified and updated the installation information in the wiki. Thanks @markdanese.

[markdanese]

I also fixed the fst problem with additional lines in Makevars. Please see this fst issue.

[pat-s]

The installation instructions for arm Macs might need an update pointing to the location of libomp/lib as described in fstpackage/fst#242 (comment).