## Summary
This PR adds cross-compilation support for three new target platforms,
upgrades LLVM to 21.1.8, and overhauls the CI pipelines around
cross-builds and testing.
## Cross-compilation
New target triples accepted via `-DCLICE_TARGET_TRIPLE=...`:
| Target triple | Host | Output |
|---|---|---|
| `x86_64-apple-darwin` | macos-15 (arm64) | macOS x64 |
| `aarch64-linux-gnu` | ubuntu-24.04 (x64) | Linux arm64 |
| `aarch64-pc-windows-msvc` | windows-2025 (x64) | Windows arm64 |
- `cmake/toolchain.cmake` — maps `CLICE_TARGET_TRIPLE` to
`CMAKE_SYSTEM_NAME`/`CMAKE_SYSTEM_PROCESSOR`/compiler `--target`; picks
up conda aarch64 sysroot when cross-compiling Linux.
- `cmake/llvm.cmake` — forwards target platform/arch to `setup-llvm.py`
so the right prebuilt LLVM is downloaded for the target.
- `CMakeLists.txt` — uses a host-side `flatc` from `PATH` under
`CMAKE_CROSSCOMPILING` instead of the in-tree target build.
- `pixi.toml`:
- Adds `osx-64`, `linux-aarch64`, `win-arm64` platforms.
- New environments: `cross-macos-x64`, `cross-linux-aarch64` (adds
`gcc_linux-aarch64` + `sysroot_linux-aarch64`), `cross-windows-arm64`.
- New lightweight `test-run` env used on native ARM/x64 runners to
execute cross-built artifacts (pulls in upstream clang+lld on macOS so
tests don't fall back to Apple clang).
- `scripts/activate_cross_linux.sh` — exports `CONDA_PREFIX`-relative
paths for the aarch64 toolchain.
- `scripts/build-llvm.py` — `--target-triple` support and a
`build_native_tools()` helper that produces host `llvm-tblgen` /
`clang-tblgen` needed when cross-compiling LLVM itself.
## LLVM upgrade 21.1.4 → 21.1.8
- `cmake/package.cmake` bumps `setup_llvm("21.1.8")`.
- `config/llvm-manifest.json` regenerated with 6 new cross-compiled
entries and a new `arch` field on every entry so lookup is `(version,
platform, arch, lto, build_type)`.
- `scripts/setup-llvm.py` — honours the new `arch` field when resolving
artifacts.
- `scripts/update-llvm-version.py` (new) — single-call version bump
across `package.cmake` + manifest.
- `scripts/validate-llvm-components.py` (new) — scans the LLVM source
tree for library targets and diffs them against
`scripts/llvm-components.json` to catch stale/misspelled component names
before a build.
- `scripts/llvm-components.json` (new) — explicit allow-list of required
LLVM/Clang library targets used by `build-llvm.py`.
## CI changes
- `.github/workflows/build-llvm.yml`:
- Adds `workflow_dispatch` with `llvm_version`, `skip_upload`, `skip_pr`
inputs.
- Matrix extended with the 6 cross-compile entries (2 per new platform:
RelWithDebInfo ± LTO).
- `build clice` / test / prune steps gated on `!matrix.target_triple`
for cross-builds; cross-built LTO entries apply the native prune
manifest (arch-independent).
- Cross-compiled binary architecture is verified with `file(1)`.
- New `upload` job triggered by `workflow_dispatch` pushes artifacts to
`clice-io/clice-llvm` and hands the manifest off to the next job.
- `.github/workflows/test-cmake.yml`:
- Build matrix gains three `build_only: true` cross entries that upload
`bin/` + `lib/` artifacts.
- New `test-cross` job runs on native `macos-15-intel`,
`ubuntu-24.04-arm`, `windows-11-arm` runners, downloads the cross-built
artifacts, and runs unit / integration / smoke tests under the
`test-run` pixi env.
- Cache keys now include `target_triple` so native and cross builds
don't collide.
- `.github/workflows/publish-clice.yml`:
- Three additional release artifacts for the new targets
(`clice-x86_64-macos-darwin`, `clice-aarch64-linux-gnu`,
`clice-aarch64-windows-msvc`), each with a matching `-symbol` archive.
## Compatibility
- All existing native builds and tests are preserved; cross entries are
additive.
- `Debug` + ASAN remains disabled on Windows (`llvm_mode == Debug && os
== windows-*` no longer appends `-asan`).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
---------
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This patch restricts the GLOB expression to only LLVM & Clang libraries,
avoiding linking to a large list of libraries when using system LLVM.
Also, this patch explicitly avoids linking to `LLVM-<ver>` and
`clang-cpp`, as they will cause lots of duplicate symbol errors
Below is a small set of errors generated when linking to `clang-cpp`:
```
ld.lld: error: duplicate symbol: clang::ast_matchers::internal::DynTypedMatcher::constructRestrictedWrapper(clang::ast_matchers::internal::DynTypedMatcher const&, clang::ASTNodeKind)
>>> defined at libclangASTMatchers.a(ASTMatchersInternal.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::Stmt::getEndLoc() const
>>> defined at libclangAST.a(Stmt.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::ast_matchers::internal::createAndVerifyRegex(llvm::StringRef, llvm::Regex::RegexFlags, llvm::StringRef)
>>> defined at libclangASTMatchers.a(ASTMatchersInternal.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::ast_matchers::internal::BoundNodesTreeBuilder::addMatch(clang::ast_matchers::internal::BoundNodesTreeBuilder const&)
>>> defined at libclangASTMatchers.a(ASTMatchersInternal.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::Stmt::getStmtClassName() const
>>> defined at libclangAST.a(Stmt.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::ast_matchers::internal::getExpansionLocOfMacro(llvm::StringRef, clang::SourceLocation, clang::ASTContext const&)
>>> defined at libclangASTMatchers.a(ASTMatchersInternal.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::transformer::remove(std::__1::function<llvm::Expected<clang::CharSourceRange> (clang::ast_matchers::MatchFinder::MatchResult const&)>)
>>> defined at libclangTransformer.a(RewriteRule.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::ast_matchers::internal::hasAnyOverloadedOperatorNameFunc(llvm::ArrayRef<llvm::StringRef const*>)
>>> defined at libclangASTMatchers.a(ASTMatchersInternal.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::transformer::detail::makeEditGenerator(clang::transformer::ASTEdit)
>>> defined at libclangTransformer.a(RewriteRule.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::Stmt::stripLabelLikeStatements() const
>>> defined at libclangAST.a(Stmt.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::Stmt::IgnoreContainers(bool)
>>> defined at libclangAST.a(Stmt.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::WhileStmt::getConditionVariable()
>>> defined at libclangAST.a(Stmt.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::ValueStmt::getExprStmt() const
>>> defined at libclangAST.a(Stmt.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::ast_matchers::internal::matchesAnyBase(clang::CXXRecordDecl const&, clang::ast_matchers::internal::Matcher<clang::CXXBaseSpecifier> const&, clang::ast_matchers::internal::ASTMatchFinder*, clang::ast_matchers::internal::BoundNodesTreeBuilder*)
>>> defined at libclangASTMatchers.a(ASTMatchersInternal.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::IfStmt::getConditionVariable()
>>> defined at libclangAST.a(Stmt.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
ld.lld: error: duplicate symbol: clang::transformer::detail::buildMatchers(clang::transformer::RewriteRuleBase const&)
>>> defined at libclangTransformer.a(RewriteRule.cpp.obj)
>>> defined at libclang-cpp.dll.a(libclang-cpp.dll)
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Chores**
* Improved build configuration to explicitly discover and link LLVM and
Clang libraries plus optional z/zstd compression libraries; updated
linking to include these groups and retained the static Clang build
definition, resulting in more reliable and consistent compilation across
environments.
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
