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Architecture of airspy-fmradion — signal flow from SDR source to audio output, key type aliases, the Source abstraction, and the FM decoder pipeline. Use when reading or modifying the DSP chain, sources, decoders, buffers, or audio output.

Build airspy-fmradion with CMake — full clean build, incremental rebuild, optimization flags, optional MP3 feature, and CMake-fetched dependencies. Use when compiling the project, editing CMakeLists.txt, or investigating build errors.

Commit message convention for airspy-fmradion. Use when writing a git commit message for this repository.

Format airspy-fmradion sources with clang-format and cmake-format. Use after editing C++ sources or CMakeLists.txt, and before committing code changes.

clang-format rules (InsertBraces=true is the one non-cosmetic transform, SortIncludes=true with ckcdeb.h pinned first via clang-format off/on islands, format-stability check before commit) and clangd/.clang-tidy editor config (keep in sync with the linux target's CFLAGS; spurious C++-mode diagnostics are not build errors). Use when reformatting, editing .clang-format/.clangd/.clang-tidy, or interpreting clangd diagnostics.

Signal-handling conventions - the ck_signal() sigaction wrapper (SA_RESTART, unconditional, NOT gated on CK_POSIX_SIG), the ck_sig_t handler-pointer typedef, which calls deliberately remain plain signal(), the SIGALRM longjmp timers, and the runtime signal test battery (PAUSE 2 = 2.00s, SIGINT mid-PAUSE). Use when touching signal handlers, ck_signal/ck_sig_t, timers, or anything under <signal.h>.

Detailed changelog of the 2026-06 simplification campaign - platform/feature removals (Windows/OS2/VMS, Android, SSL/Kerberos, K&R C, obsolete platform macros, dead makefile targets, ifdef COMMENT blocks) and the macro-expansion modernizations, with per-change caveats and pointers to the SIMPLIFY_*/report files. Use when investigating why code, macros, files, or makefile targets are absent; before removing anything as "obsolete"; or when planning/writing a new simplification.

Build C-Kermit (make linux → wermit), regenerate ckcpro.c after editing ckcpro.w, and verify changes are behavior-preserving — SOURCE_DATE_EPOCH byte-identical rebuild gate, per-object .o comparison, macOS/BSD