robobun f65e280521 Add Nix flake for development environment (#23406) ...

Provides a Nix flake as an alternative to `scripts/bootstrap.sh` for
setting up the Bun development environment.

## What's included:

- **flake.nix**: Full development environment with all dependencies from
bootstrap.sh
  - LLVM 19, CMake 3.30+, Node.js 24, Rust, Go
  - Build tools: ninja, ccache, pkg-config, make
  - Chromium dependencies for Puppeteer testing
  - gdb for core dump debugging

- **shell.nix**: Simple wrapper for `nix-shell` usage

- **cmake/CompilerFlags.cmake**: Nix compatibility fixes
  - Disable zstd debug compression (Nix's LLVM not built with zstd)
  - Set _FORTIFY_SOURCE=0 for -O0 debug builds
  - Downgrade _FORTIFY_SOURCE warning to not error

## Usage:

```bash
nix-shell
export CMAKE_SYSTEM_PROCESSOR=$(uname -m)
bun bd
```

## Verified working:
✅ Successfully compiles Bun debug build
✅ Binary tested: `./build/debug/bun-debug --version` → 1.2.24-debug
✅ All dependencies from bootstrap.sh included

## Advantages:
- Fully isolated (no sudo required)
- 100% reproducible dependency versions  
- Fast setup with binary caching

---------

Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>

2025-10-10 02:13:28 -07:00

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