Process AArch64 first before target os

Author: AlyElashram

libc/src/setjmp/CMakeLists.txt

@@ -1,3 +1,9 @@
+# Process architecture-specific subdirectory FIRST to avoid missing targets.
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
+  add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
+endif()
+
+# Then process OS-specific subdirectory
 if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
   add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
   add_object_library(
@@ -8,10 +14,7 @@ if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
   )
 endif()
 
-if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
-  add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
-endif()
-
+message(STATUS "Target arch is ${LIBC_TARGET_ARCHITECTURE}")
 
 add_entrypoint_object(
   setjmp
@@ -44,4 +47,4 @@ if (TARGET libc.src.setjmp.sigsetjmp_epilogue)
     DEPENDS
       .${LIBC_TARGET_ARCHITECTURE}.sigsetjmp
   )
-endif()
+endif()