43 lines
1.5 KiB
Markdown
43 lines
1.5 KiB
Markdown
# wasm-sdk
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A SDK for LLVM C and C++ WebAssembly development based on Nix.
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It builds all required dependencies (*clang, clang++, wasm-ld, libcxx, compiler-rt*, and *wasi-libc*)
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and exposes the following environment variables needed to compile to WebAssembly, for example:
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```
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WASM_LLVM=/nix/store/akpcpb9ycb98jjbp6dyg1j65vkwqp1lm-wasm-llvm
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WASM_LIBCXX_LIB=/nix/store/ll4hi2jkhv8399dhbz6q0qgw97c6hyja-wasm-libcxx/lib
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WASM_LIBCXX_INC=/nix/store/ll4hi2jkhv8399dhbz6q0qgw97c6hyja-wasm-libcxx/include/c++/v1
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WASM_COMPILER_RT_LIB=/nix/store/59lmk928vly8126zq7mabzc9123hknj2-wasm-compiler-rt/lib/wasi
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WASI_LIBC_LIB=/nix/store/qislis4ivwv3l721dbhghax6j4kp3ccb-wasi-libc/lib
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WASI_LIBC_INC=/nix/store/71k5vk20275571n0bsij42qdasbxc82b-wasi-libc-dev/include
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```
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## Goals
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* Lean toolchain leveraging as much as possible from upstream sources.
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* Basic levels of WASI (no threading, no exceptions).
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## Versions
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* LLVM: 17
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* wasi-libc: 21
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## Usage
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The included derivation produces a single file with exportable environment variables.
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Example:
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```sh
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env $(cat $(nix-build -E 'with import <nixpkgs> {}; callPackage ./default.nix {}')) printenv
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```
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A *flake* is also included that exposes the needed variables in the following ways (three ways to choose from, for convenience):
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1. as the `paths` (*attrset* type) *passthru* of the *derivation* of the *default package* (to use in other *flakes*).
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2. as exported environment variables in the *default development shell* (`nix develop`).
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3. as text in a file (`nix build` produces the file `./result`).
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