Setup a project depending on llvm using bazel

1. Create your repo, such as "BuildWithLLVM"

2. To add a local repo, copy following files to BuildWithLLVM

   • llvm-project/utils/bazel/WORKSPACE
   • .bazelrc
   • .bazelversion
   • .bazelignore

3. Add workspace name to the start of WORKSPACE file

   workspace(name = "build_with_llvm")

4. Change path in WORKSPACE

   new_local_repository(
    name = "llvm-raw",
    build_file_content = "# empty",
   # change path pointing to your llvm-project
    path = "/path/to/llvm-project",
   )

5. Test the build

   bazel build --config=generic_gcc @llvm-project//llvm:all

6. Build something depending on llvm

   Add a c++ source file main.cc

   #include <iostream>
   #include "llvm/Support/FormatVariadic.h"
   
   int main() {
    std::cout << llvm::formatv("Hello {0}", "llvm!").str() << std::endl;
    return 0;
   }

   Add BUILD file to src folder

   cc_binary(
    name = "main",
    srcs = ["src/main.cc"],
    deps = ["@llvm-project//llvm:Support"],
   )

   build run --config=generic_gcc //src:main

`Hello llvm!` should be printed.

See https://github.com/AnissL93/build_llvm_with_bazel for the code