v0.76.0 — madc's first public macOS release

Release v0.76.0 — 2026-08-11

madc's first public macOS release. The tarballs
(madc-0.76.0-macos-{arm64,x86_64}.tar.gz) run on a header-less Mac —
JIT, packed C/C++ standard-library forest, and native AOT -o that now
covers C and C++ programs — and every byte they embed is
provenance-clean: the darwin C prelude is flattened from Apple's own
APSL/BSD-licensed headers as publicly shipped by the Zig project, with
the binary naming its own prelude input and the release gate refusing
anything else. Underneath sits the release's deepest fix: on AArch64 the
hidden result pointer of a by-value class return rides x8, not the
first argument register, and madc now lets the target place it.

• Public macOS tarballs (arm64 + x86_64) — stripped, ad-hoc-signed
  hosted binaries carrying the compressed frozen forest (<string>,
  containers, streams, <algorithm> compile straight from the image);
  THIRD_PARTY_NOTICES/ ships the per-file license audit (213 APSL,
  21 BSD, 1 public domain) and the canonical APSL-2.0 text.
• Darwin AOT for C++ — madc -static-libmadc -o prog prog.mad
  emits a runnable, self-signed Mach-O executable: the fork's writer
  binds imports flat-namespace when extra dylibs are present, and
  madc puts libc++.1.dylib on the load list whenever the import set
  is Itanium-mangled. Runtime-free C and C-lane-runtime (try/catch,
  VLA) static images were already covered.
• libmadc_rt for emitted C — the tarballs ship the C-lane runtime
  archive; cc -std=c11 program.c -L<dir>/lib -lmadc_rt -lc++ links
  madc's --emit=c11 output on a stock Mac.
• The AArch64 indirect-return ABI fix — by-value class returns
  (std::locale, ostringstream::str()) declared their hidden result
  pointer as a first argument, an x86-64-only shape that read garbage
  this pointers on Apple arm64. The parameter is now marked
  (__attribute__((ret_addr)) → MIR_T_RBLK) and placed per target;
  CirBuilder::retbuf_param is its single producer.
• Target-neutral emitted C for >16-byte class returns — the
  emit-time pre-pass fuses declaration and call into
  struct __madc_ret_K X = SYM(args);, the one C spelling both ABIs
  compile to the C++ convention.
• An unprototyped call is not a variadic call (fork) — C89
  implicit-declaration calls now build their proto from the call
  site's promoted argument types; fatal on Apple arm64 before, where
  varargs are stack-banished.
• Forest fidelity under libc++ — container v39 transports the
  owner-derived Itanium symbol for bound static data members, minted
  __fwd alias tags reach the type arena, __need-protocol servings
  form no husk units, and binding is machine-portable (include-spelling
  path-tail match).
• Embedded headers rounded out — stdint.h is the complete C11
  7.20 surface, #include_next/__has_include_next answer honestly,
  and the glibc __need protocol is honoured through PCH and forest.
• Compiler fixes surfaced by the lane — file-scope static class
  objects no longer collapse to static int (one type-spec derivation
  for all storage shapes); the --emit lane opens the stdlib-flavor
  runtime before tree build, fixing facet-id externs under libc++.
• Suite grows to 1019 integration tests (JIT, EXE, OBJ, release,
  packed all 0-failure) and 1015/0 on the libc++ flavor lane; the
  on-Mac evidence battery runs 10 checks (the two fails are the named
  known-opens: groves alias-husk completion, darwin madc::value).

See CHANGELOG.md for full details.