Make: Don't build stringzilla_bare on MacOS

Author: ashvardanian

CMakeLists.txt

@@ -369,21 +369,24 @@ if(${STRINGZILLA_BUILD_SHARED})
   target_compile_definitions(stringzilla_shared PRIVATE "SZ_OVERRIDE_LIBC=1")
   target_include_directories(stringzilla_shared PUBLIC include)
 
-  
-  # Try compiling a version without linking the LibC
-  define_shared(stringzilla_bare)
-  target_compile_definitions(stringzilla_bare PRIVATE "SZ_AVOID_LIBC=1")
-  target_compile_definitions(stringzilla_bare PRIVATE "SZ_OVERRIDE_LIBC=1")
-  target_include_directories(stringzilla_bare PUBLIC include)
-
-  # Avoid built-ins on MSVC and other compilers, as that will cause compilation errors
-  target_compile_options(stringzilla_bare PRIVATE
-    "$<$<CXX_COMPILER_ID:GNU,Clang>:-fno-builtin;-nostdlib>"
-    "$<$<CXX_COMPILER_ID:MSVC>:/Oi-;/GS->")
-  target_link_options(stringzilla_bare PRIVATE "$<$<CXX_COMPILER_ID:GNU,Clang>:-nostdlib>")
-  target_link_options(stringzilla_bare PRIVATE "$<$<CXX_COMPILER_ID:MSVC>:/NODEFAULTLIB>")
-
 
+  # Try compiling a version without linking the LibC
+  # ! This is only for Linux and Windows, as on modern Arm-based MacOS machines
+  # ! we can't legally access Arm's "feature registers" without `sysctl` or `sysctlbyname`.
+  # So let's check if we are compiling for a Darwin-based OS.
+  if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+    define_shared(stringzilla_bare)
+    target_compile_definitions(stringzilla_bare PRIVATE "SZ_AVOID_LIBC=1")
+    target_compile_definitions(stringzilla_bare PRIVATE "SZ_OVERRIDE_LIBC=1")
+    target_include_directories(stringzilla_bare PUBLIC include)
+
+    # Avoid built-ins on MSVC and other compilers, as that will cause compilation errors
+    target_compile_options(stringzilla_bare PRIVATE
+      "$<$<CXX_COMPILER_ID:GNU,Clang>:-fno-builtin;-nostdlib>"
+      "$<$<CXX_COMPILER_ID:MSVC>:/Oi-;/GS->")
+    target_link_options(stringzilla_bare PRIVATE "$<$<CXX_COMPILER_ID:GNU,Clang>:-nostdlib>")
+    target_link_options(stringzilla_bare PRIVATE "$<$<CXX_COMPILER_ID:MSVC>:/NODEFAULTLIB>")
+  endif()
 endif()
 
 if(STRINGZILLA_INSTALL)