build: fetch dependencies and the LLVM prebuilt through CPM - #672
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…download The cache default was a normal variable, so CPM's own cache entry (OFF) won on the second configure and dependencies went back to _deps. The default is now the cache entry itself, with the environment and -D still winning. An LLVM archive whose extraction was interrupted is detected, removed and reported instead of being accepted as the package; a cached LLVM path that no longer exists downloads again instead of failing every configure; the version handed to CPM is a valid CMake version even for releases with a '+'; FetchContent fallbacks stay disconnected as before.
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📝 WalkthroughWalkthroughThe build system adds CPM.cmake, migrates LLVM retrieval to CPM, updates CPM cache defaults, and validates the lmdb source directory. A CMake comment now refers to CPM dependencies. ChangesDependency management migration
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: 🟠 High · up to LLVM configuration can delete developer-managed files or corrupt a shared cache during concurrent builds, while downloaded LLVM archives remain unverified. These issues should be fixed before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@cmake/llvm.cmake`:
- Around line 52-57: Add SHA-256 integrity verification to the llvm_prebuilt
CPMAddPackage configuration by supplying URL_HASH SHA256 with the maintained
checksum for each selected artifact, including the 22.1.8 archive. Ensure the
checksum mapping matches the generated URL and filename so downloads are
validated before find_package(LLVM REQUIRED CONFIG) processes them.
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A default under the source tree fails on a read-only checkout, so the cache now lives in the user's cache directory (XDG_CACHE_HOME or ~/.cache, the local application data folder on Windows) and is shared by every checkout and build tree; the environment variable and -D still win. The incomplete archive guard removes only directories inside that cache — a directory a developer pointed at through CPM_llvm_prebuilt_SOURCE is reported, not deleted — and a local lmdb package found through CPM_USE_LOCAL_PACKAGES is rejected up front, since the library is built from lmdb's sources.
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🤖 Prompt for all review comments with AI agents
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Inline comments:
In `@cmake/llvm.cmake`:
- Around line 64-65: Update the llvm_prebuilt setup around CPMAddPackage to
record whether CPM_llvm_prebuilt_SOURCE was explicitly provided before the call,
and guard the file(REMOVE_RECURSE "${llvm_prebuilt_SOURCE_DIR}") branch so it
only removes CPM-owned cache entries. Preserve explicit developer source
overrides even when their path is inside CPM_SOURCE_CACHE and lacks
lib/cmake/llvm.
- Line 65: Update the stale LLVM cache removal flow around CPMAddPackage and
file(REMOVE_RECURSE) to acquire CPM’s cache lock before checking or deleting the
entry, recheck lib/cmake/llvm while the lock is held, and remove the prebuilt
source only if it remains stale; release the lock afterward.
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A stale cached LLVM path is downloaded afresh only when it lies inside the CPM cache; a path given by hand that holds no LLVM is reported, as before this branch. The cache path is made absolute once so that ownership check compares like with like when the environment supplies a relative path.
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16bit-ykiko
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What changed
Dependency fetching moves from FetchContent to CPM.cmake (vendored v0.42.3 as
cmake/CPM.cmake) with a persistent source cache:CPM_SOURCE_CACHEdefaults to the user's cache directory ($XDG_CACHE_HOME/clice/cpmor~/.cache/clice/cpm;%LOCALAPPDATA%\clice\cpmon Windows), so every checkout and every build tree shares one cache and a read-only source tree still configures; theCPM_SOURCE_CACHEenvironment variable wins over the default and-Dwins over both. A fresh build directory reuses the dependency checkouts and the extracted LLVM archive (2.8 GB per LLVM configuration) instead of fetching them again: a second fresh configure drops from ~90 s to ~10 s locally.DOWNLOAD_ONLYURL package. An archive whose extraction was interrupted is detected, removed from the cache and reported instead of being accepted as the package (a directory supplied throughCPM_llvm_prebuilt_SOURCEis only reported); a cachedLLVM_INSTALL_PATHthat no longer exists (wiped cache) downloads again instead of failing every later configure. LMDB must come from its sources, so a local package found throughCPM_USE_LOCAL_PACKAGESis rejected with a clear error.CPM_<name>_SOURCE=<dir>(e.g.-DCPM_kotatsu_SOURCE=~/src/kotatsu) replacesFETCHCONTENT_SOURCE_DIR_<NAME>, which CPM does not honour forDOWNLOAD_ONLYpackages.CLICE_OFFLINE_BUILDwith a presetLLVM_INSTALL_PATHworks as before; without a cache CPM falls back to FetchContent under the build tree, still with updates disconnected.CI downloads everything fresh each run as it did with FetchContent; the cache pays off for developers and for any future job that restores
.cache/cpm.Tests
Local RelWithDebInfo build from a clean tree, then unit, integration (427), smoke (3) and snap (632) suites, all passing. Configure scenarios exercised by hand: second configure of the same build tree keeps the cache; a poisoned (half-extracted) LLVM cache entry is removed and reported, and the next configure re-downloads; a build tree whose cached LLVM path was deleted downloads again.