MacOS 上安装 R 包
install.packages("data.table")后面提示是否安装需要编译的版本:
Do you want to install from sources the package which needs compilation?y/n
选择了 y 之后，报错
clang: error: unsupported option '-fopenmp' 网上找到的解决方法是：
安装 clang-omp
brew install clang-omp但是提示：
Error: No available formula with the name "clang-omp" ==> Searching for a previously deleted formula (in the last month)... Error: No previously deleted formula found. ==> Searching for similarly named formulae... ==> Searching local taps... Error: No similarly named formulae found. ==> Searching taps... ==> Searching taps on GitHub... Error: No formulae found in taps.原来是 clang-omp 迁移到了 llvm 中，遂安装 llvm
brew install llvm ln -s /usr/local/opt/llvm/bin/clang /usr/local/bin/clang-omp但是还是同样的报错，观察错误提示：
clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG -I/usr/local/include -fopenmp -fPIC -Wall -g -O2 -c assign.c -o assign.o clang: error: unsupported option '-fopenmp'发现，执行的是 clang，而不是 clang-omp，所以在命令行执行
ln -s /usr/local/opt/llvm/bin/clang /usr/local/bin/clang ln -s /usr/local/opt/llvm/bin/clang++ /usr/local/bin/clang++只加一个 clang 的软链接，后面会发现还会有个 clang++ 的报错，因此需要 clang++ 也要加。