Wiktor Phillips wsphillips

## Setup GCC and CLANG Toolchains.md

      
        
          
            
              
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                bhaskarvk
                / Setup GCC and CLANG Toolchains.md
            
            
              Last active
              December 22, 2023 09:04
            
              
                Proper GCC (vers. 5/6/7) & LLVM/CLANG (vers. 4/5) Toolchain Setup on Ubuntu/Linux Mint
              
          
        
      
        
  
      
    This approach uses update-alternatives to manage GCC and LLVM/CLANG C/C++ compiler toolchains.
Although tested on Linux Mint 18.3, this approach should work on any Debian based distro or for that matter any Linux distro with update-alternatives support, provided the packages are installed correctly.
There are 3 files

gcc-alternatives.sh installs GCC versions 5/6/7 and sets up alternatives for gcc/g++/cpp/gfortran.
llvm-clang-alternatives.sh installs LLVM and CLANG versions 4/5 and sets up alternatives for various LLVM and CLANG programs including clang and clang++.
cc-alternatives.sh sets up alternatives for the cc, cxx, and the ld commands. This script can be used to change systemwide default compiler/linker combination to either GCC or CLANG.

Once these scripts are run you can change the system GCC/CLANG versions by running sudo update-alternatives --config gcc|clang. To change the default compiler/linker combo used by t