Fread Fatal Error on Mac Big Sur

Start with the reported data.table::fread(file = "~/Desktop/mtcars.csv", nThread = 1) invocation and review the supplied session information and MakeVars settings. Reproduce the fatal abort on macOS Big Sur with R 3.6.3, then determine the relevant fread or build entry point. Done means the example completes without aborting in the affected environment.

Hello all,

I am having issues with the fread function in data.table. I am currently using version 1.14.0, though this issue is reproducible on all the versions I have attempted.

The computer in question is a MacBook running Big Sur, and I am using R 3.6.3. There are compiler issues with Big Sur and Clang so I have manually installed GCC, and updated the MakeVars file. I am able to download, and compile the package.

Any attempts to use fread causes the Session to Abort with a fatal error. Find below a copy of my MakeVars file, and an example call that causes the crash.

Start: Example

data.table::fread(file = "~/Desktop/mtcars.csv", nThread = 1)
mtcars.csv

Start: Session Info

R version 3.6.3 (2020-02-29)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: OS X 11.5.2

Matrix products: default
LAPACK: /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:
[1] data.table_1.14.0

loaded via a namespace (and not attached):
[1] compiler_3.6.3 tools_3.6.3

Start: MakeVars file

FLIBS = -L/usr/local/gfortran/lib/gcc/x86_64-apple-darwin20/10.2.0 -L/usr/local/gfortran/lib -lgfortran -lquadmath -lm
LOC = /usr/local/gfortran
CXX98 = $(LOC)/bin/g++ -fopenmp
CXX98STD = -std=c++98
CXX14 = $(LOC)/bin/g++ -fopenmp
CXX14STD = -std=c++14
CXX17 = $(LOC)/bin/g++ -fopenmp
CXX20 = $(LOC)/bin/g++ -fopenmp
CXXCPP = $(LOC)/bin/g++ -fopenmp
FC = gfortran
F77 = gfortran
OBJC = gcc
OBJCXX = g++
CC = $(LOC)/bin/gcc -fopenmp
CXX = $(LOC)/bin/g++ -fopenmp
CXXSTD = -std=c++11
CXX11 = $(LOC)/bin/g++ -fopenmp # for fst package
CXX11STD = -std=c++11
CFLAGS = -g -O2 -Wall -pedantic -std=gnu99 -mtune=native -pipe
CXXFLAGS = -g -O2 -Wall -pedantic -std=c++11 -mtune=native -pipe
LDFLAGS=-L$(LOC)/lib -Wl,-rpath,$(LOC)/lib
CPPFLAGS= -fopenmp -I$(LOC)/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include
SHLIB_OPENMP_CFLAGS=-Xpreprocessor -fopenmp
SHLIB_OPENMP_CXXFLAGS=-Xpreprocessor -fopenmp