This release fixes many bugs, implements performance improvements, and significantly expands the /opt/fil distribution.

Fixes and improvements:

• Support for command-line compiler arguments to control the location of headers and libraries. Needed for Filnix.
• Improve debugging support by preserving DWARF information.
• Make mlock syscalls support invalid pointers when length is zero.
• Support feclearexcept and feenableexcept in glibc.
• Support adjtimex.
• Support more variants of futex syscalls via syscall(2).
• Support the rdtsc builtin.
• Fix a wrong assertion about thread creation during global constructor invocation.
• Make it possible to say .symver instead of .filc_symver.
• Fix ICE with -fstrict-vtable-pointers.
• Fix support for sched_setscheduler and sched_getscheduler.
• Use secure_getenv for configuring the Fil-C runtime.
• Add a simple sampling profiler (can be enabled with FILC_SAMPLING_PROFILER_ENABLED=1).
• Fix a bug that caused some allocations to be zeroed two or three times instead of just once, leading to a ~1% speedup on PizBench.
• Fix bzero and bcopy with -D_FORTIFY_SOURCE=2.
• Fix ICE using atomic add/sub on pointers.
• Add prctl PR_SET_NAME/PR_GET_NAME support. Fixes pthread_setname_np.
• Change the InvisiCaps aux to have the pointer component in the high 48 bits and the flags in the low 16 bits, resulting in better codegen. ~1% speedup on PizBench.
• Make all Fil-C slices use their own compiler runtime and crt's, so that installing filcc doesn't depend on the OS already having a gcc or clang installation. This uses the LLVM 20.1.8 compiler-rt plus a dummy stub for libunwind (since Fil-C doesn't rely on unwinding in yololand, and provides its own libunwind in userland).

New programs and libraries in /opt/fil:

• libuv
• sudo
• sed
• psmisc
• flex
• bison
• grep
• less
• diff
• gawk
• find
• gzip
• make
• patch
• tar
• icu
• procps-ng
• libevent
• tmux
• libunistring
• libidn2
• libpsl
• libtasn1
• p11-kit
• nghttp2
• curl
• wget
• git

Thank you @pcc and @mbrock for helping to contribute improvements for this release!

Guide to the available files:

• filc-0.675-linux-x86_64.tar.xz is the traditional, self-contained "pizfix" distribution. It only includes the compiler, doesn't require root, and is based on the musl libc. This is recommended for quickly trying out Fil-C.
• optfil-0.675-linux-x86_64.tar.xz is the /opt/fil distribution. It includes many useful programs like OpenSSH, sudo, tmux, and git. It's based on glibc 2.40, and requires root permissions. This is recommended for giving Fil-C deeper scrutiny.