Clojurians Log v2

Thanks @smith.adriane, I've got your LearnLisp app running on my iPhone (after seeing your talk at bbconf). I ran into a few issues and given this is a whole ecosystem and language I know nothing about, I got Claude to help me through the issues. This is what it found, in case it's helpful to anyone else:

⏺ Summary of changes

  Two background facts drove most of the changes:
  - Apple Clang 21 (Xcode 26) is stricter — new errors-as-warnings, promoted-to-error warnings, and a tightened assembler.
  - macOS Sequoia 15+ stamps a SIP-protected com.apple.provenance extended attribute on extracted files.

  The grease project bundles an old labs-openjdk-21 + GraalVM that pre-dates both of those, so it fails to build on a current Mac without patches.

  Patches

  1. libffi — assembler rejected CFI directives

  File: third_party/libffi-3.4.6/darwin_ios/src/aarch64/sysv_arm64.S
  Why: Apple Clang 21's assembler now errors on cfi_startproc placed before the function label ("invalid CFI advance_loc expression"). The file had this pattern in 3 of the 5 functions;
  the other 2 were already correct.
  Fix: Swapped cfi_startproc to come after the label in ffi_call_SYSV, ffi_closure_SYSV, ffi_go_closure_SYSV.
  (Note: this file is generated from third_party/libffi-3.4.6/src/aarch64/sysv.S by generate-darwin-source-and-headers.py; if you ever regenerate, apply the swap upstream too.)

  2. labs-openjdk — xattr -cs failed on SIP-protected attribute

  File: third_party/ios-graal-jdk-21/labs-openjdk/labs-openjdk-21/make/common/MakeBase.gmk
  Why: The install-file macro runs xattr -cs after every file copy to strip macOS extended attributes. macOS Sequoia stamps com.apple.provenance on extracted source files and that
  attribute is SIP-protected — non-root users can't remove it. With 84k+ affected files, the build was guaranteed to die.
  Fix: Filter com.apple.provenance out of the xattr-presence check (so we don't bother clearing if it's the only one), and made the actual clear non-fatal (2>/dev/null || true).

  3. Harfbuzz — -Wnontrivial-memcall is new in Apple Clang 21

  File: labs-openjdk-21/make/modules/java.desktop/lib/Awt2dLibraries.gmk
  Why: Harfbuzz's Null<T>/Crap<T> machinery memcpys into non-trivially-copyable types on purpose. New warning + -Werror = build break.
  Fix: Added nontrivial-memcall to HARFBUZZ_DISABLED_WARNINGS_clang.

  4. libpng — included Carbon-era <fp.h> on Apple platforms

  File: labs-openjdk-21/src/java.desktop/share/native/libsplashscreen/libpng/pngpriv.h
  Why: The bundled libpng (very old) had a conditional that included <fp.h> (a Mac OS Classic header) when TARGET_OS_MAC was defined. TARGET_OS_MAC is now defined for all Apple SDKs
  (macOS and iOS), so the wrong branch fired.
  Fix: Removed defined(TARGET_OS_MAC) from the conditional so Apple platforms fall through to <math.h>.

  5. libsplashscreen — -Wunterminated-string-initialization is new in Apple Clang 21

  File: labs-openjdk-21/make/modules/java.desktop/lib/Awt2dLibraries.gmk
  Why: Code like static const char szNetscape20ext[11] = "NETSCAPE2.0"; (fixed-size array exactly sized for the literal, no room for terminator) is intentional in the splashscreen GIF
  parser. New warning + -Werror = build break.
  Fix: Added unterminated-string-initialization to DISABLED_WARNINGS_clang for the libsplashscreen target.

  6. libjsound — -Wvla-cxx-extension promoted to error

  File: labs-openjdk-21/make/modules/java.desktop/Lib.gmk
  Why: PLATFORM_API_MacOSX_Ports.cpp uses C++ variable-length arrays in 7 places. Clang has long flagged this with -Wvla-cxx-extension; Apple Clang 21 makes it -Werror by default in this
  build config.
  Fix: Added vla-cxx-extension to DISABLED_WARNINGS_clang for libjsound.