michael/wasi-sdk-nixos
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feat: symlink all deps using symlinkJoin

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Michael Franzl 2024-05-12 10:46:29 +02:00
parent 68fbcfb32e
commit 7e18cfab68
Signed by: michael
GPG key ID: F2FA572344C60B07
3 changed files with 17 additions and 49 deletions
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32
README.md
View file

@ -1,18 +1,6 @@
# wasm-sdk
A SDK for LLVM C and C++ WebAssembly development based on Nix.
It builds all required dependencies (*clang, clang++, wasm-ld, libcxx, compiler-rt*, and *wasi-libc*)
and exposes the following environment variables needed to compile to WebAssembly, for example:
```
WASM_LLVM=/nix/store/akpcpb9ycb98jjbp6dyg1j65vkwqp1lm-wasm-llvm
WASM_LIBCXX_LIB=/nix/store/ll4hi2jkhv8399dhbz6q0qgw97c6hyja-wasm-libcxx/lib
WASM_LIBCXX_INC=/nix/store/ll4hi2jkhv8399dhbz6q0qgw97c6hyja-wasm-libcxx/include/c++/v1
WASM_COMPILER_RT_LIB=/nix/store/59lmk928vly8126zq7mabzc9123hknj2-wasm-compiler-rt/lib/wasi
WASI_LIBC_LIB=/nix/store/qislis4ivwv3l721dbhghax6j4kp3ccb-wasi-libc/lib
WASI_LIBC_INC=/nix/store/71k5vk20275571n0bsij42qdasbxc82b-wasi-libc-dev/include
```
A *Nix*-based SDK for C and C++ development targeting WebAssembly.
## Goals
@ -28,16 +16,10 @@ WASI_LIBC_INC=/nix/store/71k5vk20275571n0bsij42qdasbxc82b-wasi-libc-dev/include
## Usage
The included derivation produces a single file with exportable environment variables.
The package contains all required dependencies in the following build subdirectories:
Example:
```sh
env $(cat $(nix-build -E 'with import <nixpkgs> {}; callPackage ./default.nix {}')) printenv
```
A *flake* is also included that exposes the needed variables in the following ways (three ways to choose from, for convenience):
1. as the `paths` (*attrset* type) *passthru* of the *derivation* of the *default package* (to use in other *flakes*).
2. as exported environment variables in the *default development shell* (`nix develop`).
3. as text in a file (`nix build` produces the file `./result`).
* `bin`: compilers (`clang`, `clang++`) and linker (`wasm-ld`)
* `include`: *libc* headers
* `include/c++/v1`: *libcxx* headers
* `lib`: all *libc* and *libcxx* static libraries
* `lib/wasi`: compiler-rt builtins static library

33
default.nix
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@ -1,34 +1,21 @@
{ pkgs, lib, ... }:
{ pkgs, ... }:
let
wasm-llvm = import ./wasm-llvm.nix { inherit pkgs; };
wasm-libcxx = import ./wasm-libcxx.nix { inherit pkgs; };
wasi-libc = import ./wasi-libc.nix { inherit pkgs; };
wasm-compiler-rt = import ./wasm-compiler-rt.nix { inherit pkgs; };
paths = {
WASM_LLVM = wasm-llvm;
WASM_LIBCXX_LIB = "${wasm-libcxx}/lib";
WASM_LIBCXX_INC = "${wasm-libcxx}/include/c++/v1";
WASM_COMPILER_RT_LIB = "${wasm-compiler-rt}/lib/wasi";
WASI_LIBC_LIB = "${wasi-libc}/lib";
WASI_LIBC_INC = "${wasi-libc.dev}/include";
};
pathsFileContents = lib.strings.concatLines (
lib.attrsets.mapAttrsToList (name: value: name + "=" + value) paths
);
in
pkgs.stdenv.mkDerivation rec {
pkgs.symlinkJoin {
name = "wasm-sdk";
version = "1.0.0";
paths = [
wasm-llvm
wasm-libcxx
wasi-libc
wasi-libc.dev
wasm-compiler-rt
];
dontUnpack = true;
installPhase = ''
echo "${pathsFileContents}" > $out
'';
passthru = {
inherit paths;
};
}

1
flake.nix
View file

@ -12,6 +12,5 @@
{
packages.x86_64-linux.default = package;
formatter.x86_64-linux = pkgs.nixfmt-rfc-style;
devShells.x86_64-linux.default = pkgs.mkShell package.paths;
};
}