kou commented on code in PR #50587:
URL: https://github.com/apache/arrow/pull/50587#discussion_r3648281579


##########
cpp/cmake_modules/ThirdpartyToolchain.cmake:
##########
@@ -410,6 +410,15 @@ if(ARROW_AZURE)
   set(ARROW_WITH_AZURE_SDK ON)
 endif()
 
+# The macOS 11.3 SDK has incomplete C++20 concepts support, which prevents
+# simdjson headers from compiling. Disable simdjson concepts for this SDK.
+if(ARROW_JSON
+   AND CMAKE_OSX_SYSROOT
+   AND CMAKE_OSX_SYSROOT MATCHES "MacOSX11\\.3\\.sdk$")
+  message(STATUS "Disabling simdjson concepts for macOS SDK 11.3")
+  add_compile_definitions(SIMDJSON_CONCEPT_DISABLED=1)
+endif()

Review Comment:
   @Reranko05 Could you move this to `build_simdjson()` and use 
`target_compile_options()` instead of `add_compile_definitions()` as a 
follow-up task?
   
   Could you report this to upstream? Upstream also checks clang version but we 
need to SDK version not clang version.
   
https://github.com/simdjson/simdjson/blob/8e6bac94877f2d3d026000d36ce81e0aaf38d26f/include/simdjson/compiler_check.h#L83-L87



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