cachepot vs clcache

Cachepot is a compiler caching tool for Linux, macOS, Windows, and self-hosted environments. It keeps compilation results on local disk or cloud storage so a build can reuse them rather than compile again when possible. The documented compilers include GCC, Clang, MSVC, rustc, NVCC, and Diab. Cachepot can also distribute compilation in an icecream-style setup, automatically packaging local toolchains. Storage choices include local disk, S3, Redis, Memcached, Google Cloud Storage, and Azure Blob Storage. Build integrations include Cargo, CMake, GNU make, Jenkins, and GitLab CI. The project describes authentication, encrypted transport, and sandboxed execution on build servers as security features; bubblewrap is its preferred sandbox option, with Docker also supported. The default local cache limit is 10 gigabytes and can be changed with CACHEPOT_CACHE_SIZE. Rust crates that invoke the system linker and incrementally compiled crates cannot be cached, and cache hits require matching absolute paths. Cachepot is free and open source under Apache-2.0, but its repository was archived on February 28, 2023, in favor of upstream sccache.

clcache is a free, open-source Python script for Windows builds using Microsoft Visual C++ cl.exe. It intercepts compiler calls and reuses cached object files to avoid recompiling matching work, while unsupported invocations can be passed to the real compiler. Cache keys use preprocessed source, a normalized command line, and the compiler binary’s size and modification time. Command-line controls provide statistics, cleanup, clearing, and maximum-size settings; the default limit is 1073741824 bytes (1 GiB). Object files can be compressed at levels 1 through 9, though changing compression settings requires clearing the cache. Hard-link mode requires cache and build directories on the same drive. Documentation covers Visual Studio and MSBuild integration, recommends disabling TrackFileAccess, and describes optional hash caching and memcached storage. The documented path requires /c, excludes /link and /Zi, and supports /Z7. INCLUDE and LIBPATH changes may not be detected.