fix(build): make macOS release builds work natively

The --mac-release path (full-node and --lite-backend) had never run on a real
Mac and broke on several Linux-only assumptions:

- build.sh version parser used GNU sed \+ (BSD sed reads it literally), so it
  aborted before compiling — switched to POSIX [[:space:]][[:space:]]*.
- build.sh libsodium universal check used GNU grep \| — switched to grep -E.
- libwebp's cpu.cmake applies -mno-sse2 to its reference DSP files; under a
  universal build (-arch arm64;x86_64) that lands on the x86_64 slice, where it
  disables _Float16 and breaks the SDK 26 <math.h>. Added an idempotent
  FetchContent PATCH_COMMAND (cmake/patch-libwebp-simd.cmake) to neutralize it.
- The SDXL lite backend static lib needs Security + CoreFoundation frameworks on
  macOS; added them to the imported dragonx_lite_backend target for APPLE.
- Added a DRAGONX_MAC_ARCHS override plus auto-detect: with --lite-backend the
  app is built for the arch(es) the backend .a actually provides (its pinned
  ring 0.16.11 is x86_64-only), instead of failing to link a universal app.
- build-lite-backend-artifact.sh uses bash 4+ (mapfile); added a re-exec guard
  for macOS's stock bash 3.2 and added bash to setup.sh's macOS core deps.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CMakeLists.txt

@@ -136,6 +136,13 @@ if(DRAGONX_ENABLE_LITE_BACKEND)
     set_target_properties(dragonx_lite_backend PROPERTIES
         IMPORTED_LOCATION "${DRAGONX_LITE_BACKEND_LIBRARY}"
     )
+    if(APPLE)
+        # The Rust backend's TLS stack (security-framework / core-foundation crates)
+        # references Secure Transport (SSL*) + CoreFoundation symbols. Link the frameworks
+        # that provide them, or the static lib leaves ~130 symbols undefined at link time.
+        set_property(TARGET dragonx_lite_backend APPEND PROPERTY
+            INTERFACE_LINK_LIBRARIES "-framework Security" "-framework CoreFoundation")
+    endif()
     if(DRAGONX_LITE_BACKEND_INCLUDE_DIR)
         if(NOT IS_DIRECTORY "${DRAGONX_LITE_BACKEND_INCLUDE_DIR}")
             message(FATAL_ERROR "DRAGONX_LITE_BACKEND_INCLUDE_DIR does not exist: ${DRAGONX_LITE_BACKEND_INCLUDE_DIR}")
@@ -284,6 +291,15 @@ FetchContent_Declare(
     GIT_REPOSITORY https://github.com/webmproject/libwebp.git
     GIT_TAG v1.4.0
     GIT_SHALLOW TRUE
+    # libwebp's cpu.cmake applies -mno-sse2/-mno-sse4.1 to its scalar reference DSP
+    # files when it can't probe SSE support. Under a macOS universal build
+    # (-arch arm64;x86_64) that probe fails, so the flags land on the x86_64 slice,
+    # where -mno-sse2 disables _Float16 and breaks the SDK's <math.h>. Neutralize
+    # those disable flags (SSE2 is x86_64 baseline). Portable + idempotent; a no-op
+    # for single-arch Linux/Windows/x86_64 builds. See cmake/patch-libwebp-simd.cmake.
+    PATCH_COMMAND ${CMAKE_COMMAND}
+        -DCPU_CMAKE=<SOURCE_DIR>/cmake/cpu.cmake
+        -P ${CMAKE_CURRENT_SOURCE_DIR}/cmake/patch-libwebp-simd.cmake
 )
 set(WEBP_LINK_STATIC ON CACHE BOOL "" FORCE)
 set(WEBP_BUILD_ANIM_UTILS OFF CACHE BOOL "" FORCE)

build.sh

@@ -131,7 +131,7 @@ fi
 # truth): the full-node app uses project() VERSION + DRAGONX_VERSION_SUFFIX; ObsidianDragonLite uses
 # DRAGONX_LITE_VERSION + DRAGONX_LITE_VERSION_SUFFIX.
 _cml="$SCRIPT_DIR/CMakeLists.txt"
-_full_ver=$(sed -n 's/^[[:space:]]*VERSION[[:space:]]\+\([0-9][0-9.]*\).*/\1/p' "$_cml" | head -1)
+_full_ver=$(sed -n 's/^[[:space:]]*VERSION[[:space:]][[:space:]]*\([0-9][0-9.]*\).*/\1/p' "$_cml" | head -1)
 _full_suffix=$(sed -n 's/^set(DRAGONX_VERSION_SUFFIX[[:space:]]*"\([^"]*\)").*/\1/p' "$_cml" | head -1)
 _lite_ver=$(sed -n 's/^set(DRAGONX_LITE_VERSION[[:space:]]*"\([^"]*\)").*/\1/p' "$_cml" | head -1)
 _lite_suffix=$(sed -n 's/^set(DRAGONX_LITE_VERSION_SUFFIX[[:space:]]*"\([^"]*\)").*/\1/p' "$_cml" | head -1)
@@ -901,8 +901,26 @@ build_release_mac() {
         fi
         info "macOS cross-compiler: $OSXCROSS_CXX (arch: $MAC_ARCH)"
     else
-        # Native macOS: build universal binary (arm64 + x86_64)
+        # Native macOS: build universal (arm64 + x86_64) by default. Override with
-        MAC_ARCH="universal"
+        # DRAGONX_MAC_ARCHS (e.g. "x86_64").
+        MAC_ARCHS="${DRAGONX_MAC_ARCHS:-arm64;x86_64}"
+        # When linking the real lite backend, the app can only include architectures
+        # the backend static library actually provides. Its pinned ring 0.16.11 has no
+        # Apple-Silicon assembly, so that artifact is x86_64-only — constrain the app
+        # arch to the backend's (unless the user explicitly forced DRAGONX_MAC_ARCHS),
+        # otherwise the arm64 slice fails to link.
+        if $DO_LITE_BACKEND && [[ -z "${DRAGONX_MAC_ARCHS:-}" && -n "${lb_lib:-}" ]] && command -v lipo &>/dev/null; then
+            local _backend_archs; _backend_archs=$(lipo -archs "$lb_lib" 2>/dev/null | tr ' ' ';')
+            if [[ -n "$_backend_archs" && "$_backend_archs" != "$MAC_ARCHS" ]]; then
+                warn "Lite backend provides only [$_backend_archs] — building the app for that instead of universal."
+                MAC_ARCHS="$_backend_archs"
+            fi
+        fi
+        if [[ "$MAC_ARCHS" == *";"* || "$MAC_ARCHS" == *","* ]]; then
+            MAC_ARCH="universal"
+        else
+            MAC_ARCH="$MAC_ARCHS"
+        fi
         export MACOSX_DEPLOYMENT_TARGET="11.0"
     fi
 
@@ -990,7 +1008,7 @@ TOOLCHAIN
             need_sodium=true
         elif [[ -f "$SCRIPT_DIR/libs/libsodium/lib/libsodium.a" ]]; then
             # Rebuild if existing lib is not universal (single-arch won't link)
-            if ! lipo -info "$SCRIPT_DIR/libs/libsodium/lib/libsodium.a" 2>/dev/null | grep -q "arm64.*x86_64\|x86_64.*arm64"; then
+            if ! lipo -info "$SCRIPT_DIR/libs/libsodium/lib/libsodium.a" 2>/dev/null | grep -Eq "arm64.*x86_64|x86_64.*arm64"; then
                 info "Existing libsodium is not universal — rebuilding ..."
                 rm -rf "$SCRIPT_DIR/libs/libsodium"
                 need_sodium=true
@@ -1001,13 +1019,13 @@ TOOLCHAIN
             "$SCRIPT_DIR/scripts/fetch-libsodium.sh"
         fi
 
-        info "Configuring (native universal arm64+x86_64) ..."
+        info "Configuring (native macOS, arch: $MAC_ARCHS) ..."
         cmake "$SCRIPT_DIR" \
             -DCMAKE_BUILD_TYPE=Release \
             -DCMAKE_CXX_FLAGS_RELEASE="-O3 -DNDEBUG" \
             -DDRAGONX_USE_SYSTEM_SDL3=OFF \
             -DCMAKE_OSX_DEPLOYMENT_TARGET=11.0 \
-            -DCMAKE_OSX_ARCHITECTURES="arm64;x86_64" \
+            -DCMAKE_OSX_ARCHITECTURES="$MAC_ARCHS" \
             "${CMAKE_LITE_ARGS[@]}"
     fi
 

cmake/patch-libwebp-simd.cmake

@@ -0,0 +1,31 @@
+# patch-libwebp-simd.cmake — portable, idempotent FetchContent patch for libwebp.
+#
+# libwebp's cmake/cpu.cmake compiles its scalar *reference* DSP files with the
+# SSE-disable flags "-mno-sse4.1;-mno-sse2" whenever it can't positively detect
+# SSE support. Under a macOS *universal* build (-arch arm64;x86_64) the per-arch
+# SSE flag probe fails (a flag valid for x86_64 is invalid for arm64), so those
+# disable flags get applied to the x86_64 slice. clang gates the _Float16 type on
+# SSE2 for x86_64, and the macOS 15+/26 SDK's <math.h> declares _Float16 math
+# functions unconditionally — so any TU including <math.h> fails to compile with
+# "_Float16 is not supported on this target".
+#
+# SSE2 is part of the x86_64 baseline ABI, so disabling it on the reference files
+# is unnecessary on every platform we target. Blanking the SSE entries (indices
+# must stay aligned with WEBP_SIMD_FLAGS) fixes the universal build and is a no-op
+# for single-arch Linux/Windows/x86_64 builds. Idempotent: re-running is a no-op.
+if(NOT DEFINED CPU_CMAKE OR NOT EXISTS "${CPU_CMAKE}")
+    message(FATAL_ERROR "patch-libwebp-simd: cpu.cmake not found at '${CPU_CMAKE}'")
+endif()
+
+file(READ "${CPU_CMAKE}" _contents)
+string(REPLACE
+    "set(SIMD_DISABLE_FLAGS \"-mno-sse4.1;-mno-sse2;;-mno-dspr2;;-mno-msa\")"
+    "set(SIMD_DISABLE_FLAGS \";;;-mno-dspr2;;-mno-msa\")"
+    _patched "${_contents}")
+
+if(_patched STREQUAL _contents)
+    message(STATUS "patch-libwebp-simd: no change (already patched or pattern absent)")
+else()
+    file(WRITE "${CPU_CMAKE}" "${_patched}")
+    message(STATUS "patch-libwebp-simd: neutralized x86 SSE-disable flags in cpu.cmake")
+endif()

scripts/build-lite-backend-artifact.sh

@@ -1,5 +1,17 @@
 #!/usr/bin/env bash
 
+# This script uses bash 4+ features (mapfile, safe empty-array expansion under
+# `set -u`). macOS ships bash 3.2, so re-exec under a newer bash when one is
+# present (Homebrew), and fail with a clear message otherwise.
+if [ "${BASH_VERSINFO:-0}" -lt 4 ]; then
+    for _newer_bash in /opt/homebrew/bin/bash /usr/local/bin/bash; do
+        [ -x "$_newer_bash" ] && exec "$_newer_bash" "$0" "$@"
+    done
+    echo "ERROR: build-lite-backend-artifact.sh requires bash 4+ (found ${BASH_VERSION:-unknown})." >&2
+    echo "       On macOS: brew install bash" >&2
+    exit 1
+fi
+
 set -euo pipefail
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

setup.sh

@@ -133,7 +133,7 @@ pkgs_core_arch="base-devel cmake git pkg-config
     libxkbcommon wayland libsodium curl
     autoconf automake libtool wget python xxd"
 
-pkgs_core_macos="cmake python xxd"
+pkgs_core_macos="bash cmake python xxd"
 
 # Windows cross-compile (from Linux)
 pkgs_win_debian="mingw-w64 zip"