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docs: install from the Catcrafts Flatpak repo

Browse source 
The README leads with the Flatpak install, keeps the native loop as the
way to build from source, and drops the tarball, musl and makepkg text
that no longer describes anything CI produces. The install layout shows
the /app tree and the per-app cache directory.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
Jorijn van der Graaf 2026-10-02 22:36:56 +02:00
commit 2b7c8f7f2d
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
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39
README.md
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@ -2,9 +2,21 @@
A C++26 modules build system. Project descriptions are written in C++ with no JSON, no Lua, no embedded DSL. You write a `project.cpp` that constructs a `Configuration` and returns it; Crafter Build compiles, loads, and executes it.
## Quick start (Linux)
## Install
Bootstrap requires `clang`, `cmake`, `git`, `lld`, and `libc++`.
crafter-build ships as a Flatpak that carries its own clang, lld, libc++ and WASI sysroot, so every machine builds with the same compiler:
```bash
flatpak remote-add --if-not-exists catcrafts https://flatpak.catcrafts.net/catcrafts.flatpakrepo
flatpak install catcrafts net.catcrafts.CrafterBuild
alias crafter-build='flatpak run net.catcrafts.CrafterBuild'
```
Pre-release builds of `master` are the `beta` branch (`flatpak install catcrafts net.catcrafts.CrafterBuild//beta`), and every release also attaches a single-file bundle on the Forgejo releases page (`flatpak install --user crafter-build-<version>.flatpak`). The sandbox sees the whole host filesystem, so projects can live anywhere. Binaries built for the host link the bundled `libc++.so.1` through an rpath into the Flatpak: they run inside it (`-r`, the test runner), and are not meant to be copied out onto the host.
## Building from source (Linux)
The development loop is native. It needs `clang`, `cmake`, `git`, `lld` and `libc++` with its std module source:
```bash
./build.sh # produces bin/crafter-build
@ -13,13 +25,7 @@ Bootstrap requires `clang`, `cmake`, `git`, `lld`, and `libc++`.
The compiler is resolved once per run: `CRAFTER_BUILD_LLVM_DIR` if set, else a `clang++` installed beside crafter-build (`<prefix>/bin`), else PATH. `crafter-build --version` prints the version and the compiler in use; `crafter-build --help` lists the other overrides (`CRAFTER_BUILD_LIBCXX_DIR`, `CRAFTER_BUILD_LIBCLANG`, `CRAFTER_BUILD_WASI_SYSROOT`, `CRAFTER_MINGW_DIR`). A `Configuration` targets the host triple unless `cfg.target` says otherwise.
The bootstrap targets the host toolchain's own triple (`clang++ -print-target-triple`): `x86_64-pc-linux-gnu` on glibc distros, `x86_64-alpine-linux-musl` on Alpine/postmarketOS (`apk add clang clang-dev lld libc++-dev llvm-libunwind-dev llvm-runtimes llvm llvm-dev cmake build-base python3 git`). Override with `CRAFTER_BUILD_TARGET=`. CI ships both: `crafter-build-linux-x86_64-v{2,3,4}.tar.gz` (glibc) and `crafter-build-linux-x86_64-musl-v2.tar.gz` (musl, needs `libc++` at runtime — the launcher dlopens `project.so`, so it cannot be static).
To build the system as a distro package on Arch:
```bash
makepkg -si # uses CRAFTER_BUILD_MARCH=x86-64-v3 by default for portability
```
The bootstrap targets the toolchain's own triple (`clang++ -print-target-triple`); override with `CRAFTER_BUILD_TARGET=`. The Flatpak is built from `packaging/flatpak/net.catcrafts.CrafterBuild.yaml`, which runs this same bootstrap, the self-host build and the test suite inside the sandbox against the bundled toolchain (`CRAFTER_BUILD_LLVM_DIR=/app`).
## Writing a project.cpp
@ -103,13 +109,20 @@ import Crafter.LintRules;
## Install layout
Inside the Flatpak:
```
<prefix>/bin/crafter-build # the executable
<prefix>/lib/libcrafter-build.a # static archive for downstream consumers
<prefix>/share/crafter-build/*.cppm # module sources (rebuilt on user machine on first run)
~/.cache/crafter.build/<target>-<march>-<clang>-<hash>/ # std.pcm + Crafter.Build*.pcm, built locally per toolchain
/app/bin/crafter-build # the executable
/app/bin/clang++ lld llvm-ar wasmtime # the bundled toolchain the executable resolves first
/app/lib/libcrafter-build.a # static archive for downstream consumers
/app/share/crafter-build/*.cppm # module sources (rebuilt on the user's machine on first run)
/app/share/wasi-sysroot/ # WASI sysroot for wasm32 targets
~/.var/app/net.catcrafts.CrafterBuild/cache/crafter.build/<target>-<march>-<clang>-<hash>/
# std.pcm + Crafter.Build*.pcm, built locally per toolchain
```
A source build uses the same shape under the checkout (`bin/`, `lib/`, `share/crafter-build/`) with the system compiler and `~/.cache/crafter.build/`.
## Tests
Tests live under `tests/<Name>/`. The simplest case is a single C++ file: