C++ Bazel Rules with Nix Toolchain Example

This repository demonstrates how to use Nix to provide a C++ toolchain for Bazel builds.

Setup

1. Enter the development shell:

   nix-shell

2. Build the toolchain and example:

   # First build the toolchain
   bazel build @nix_toolchain_defs
   
   # Then build the example
   cd example
   bazel build //:hello

3. Run the example:

   bazel run //:hello

Structure

• nix_toolchain_defs.nix: Defines the Nix derivation that generates the Bazel rules
• toolchain/: Contains the Bazel toolchain definition
• example/: A simple example project using the toolchain
• shell.nix: Development environment with all required dependencies

Troubleshooting

If you encounter issues with the toolchain, verify that:

1. The nix_toolchain_defs.nix file outputs a directory (not a single file)
2. The toolchain registration in WORKSPACE is correct
3. All required dependencies are available in the shell environment