Update of Mac installation information for Monterey (v 12)
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 55/100
- Issue type
- Documentation
- Clarity
- Clearly specified
- Activity status
- Stale
- Tech stack
- r
- Domain
- documentation
Research direction
Open the data.table Wiki Installation page and review Step 2, Option 1 (LLVM), especially the Makevars specifications for Monterey and Homebrew. Compare that section with the working configuration in the issue, then update the instructions so installation from source and OpenMP setup are accurately documented; done means the page reflects the reported Monterey setup.
Written by the indexing model from the issue text.
Description
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
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