Programs That Work in Fil-C

Lots of programs work in Fil-C with zero or minimal changes. This page enumerates programs and libraries that are known to have been ported to Fil-C along with notes about how many changes were required.

• musl. Used as Fil-C's libc. Significant changes required (replacing musl's inline assembly for calling syscalls with usage of Fil-C's syscall API.
• libc++abi. Required moderate changes to the C++ exception personality function so that it uses Fil-C's variant of libunwind and Fil-C's way of tracking exception tables.
• libc++. Tiny changes only, mostly to invoke futexes using Fil-C's syscall API.
• Python 3.12.5. Moderate changes required, mostly to switch the Python GC's headers from uintptr_t to a pointer type so they preserve capability.
• bzip2. No changes, works out of the box.
• bzip3. No changes, works out of the box.
• curl 8.9.1. Build system changes only (version script handling).
• dask 0.5.12. One tiny change: use fork(2) instead of vfork(2).
• expat 2.7.1. Build system changes only (version script handling).
• icu4c 76.1. Tiny changes (roughly 4KB patch).
• jpeb 6b. No changes, works out of the box.
• libarchive 3.7.4. Tiny changes (red-black tree and resizable array need to use pointer type instead of uintptr_t).
• libedit 20240808-3.1. Tiny changes (that are more about porting to musl than about Fil-C).
• libevent 2.1.12. Changes to test suite only, works out of the box otherwise.
• libffi 3.4.6. Moderate changes needed because libffi under Fil-C has to use Fil-C reflection API instead of assembly and JITing.
• libuev 2.4.1. No changes, works out of the box.
• libuv 1.48.0. Tiny change required for passing pointers across a write(2) syscall (this can be done using the zexact_ptrtable API).
• libxml2 2.14.4. One line change (missing _Atomic on a pointer field that gets raced).
• lua 5.4.7. Build system changes only (disable libreadline dependency).
• mg. No changes, works out of the box.
• ncurses 6.5-20240720. No changes, works out of the box.
• nghttp2 1.62.1. No changes, works out of the box.
• openssh 9.8p1. No changes, works out of the box.
• openssl 3.3.1. Build system changes only (version script handling). Also added an assertion that mem_sec isn't used (nobody seems to use it anyway, so adding that assertion isn't necessary to have a working OpenSSL).
• pcre 8.39. No changes, works out of the box.
• pcre2 10.44. Only test suite changes (needed because of musl locale handling). Works out of the box if you don't run the test suite.
• pkgconf 2.3.0. Build system changes only (version script handling).
• quickjs. Tiny changes only (change a uintptr_t to a void* and use the stdlib's qsort_r).
• simdutf 5.5.0. Tiny change only (use Fil-C API for cpuid and xgetbv instead of assembly).
• sqlite. Moderate changes needed (roughly 16KB patch).
• sudo 1.9.15p5. Build system changes only (version script handling).
• tcl 8.6.15. No changes, works out of the box.
• tmux 3.5a. No changes, works out of the box.
• toybox 8.12. Tiny changes (use fork(2) instead of vfork(2) and use pointer types instead of integer types in a few places).
• wg14_signals. No changes, works out of the box.
• xz 5.6.2. Tiny changes (build system linker script changes, change one pointer arithmetic expression, align a union, and disable one assembly snippet).
• zlib 1.3. No changes, works out of the box.
• zsh 5.8.0.1-dev. Tiny changes only (add a field to a struct to properly align some fields, disable custom malloc).
• zstd 1.5.6. Tiny changes only (use Fil-C cpuid API instead of assembly and disable some assembly snippets).
• cmake 3.30.2. No changes, works out of the box.
• brotli 1.1.0. No changes, works out of the box.
• google test. No changes, works out of the box.
• google benchmark. No changes, works out of the box.
• ada url. No changes, works out of the box.
• simdjson. Tiny change only (use Fil-C API for cpuid and xgetbv instead of assembly).

Fil-C: Systems programming with confidence.