Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -429,6 +429,9 @@
 option(LLVM_EXTERNALIZE_DEBUGINFO
   "Generate dSYM files and strip executables and libraries (Darwin Only)" OFF)
 
+option(LLVM_CODESIGNING_IDENTITY
+  "Sign executables and dylibs with the given identity (Darwin Only)" OFF)
+
 # If enabled, verify we are on a platform that supports oprofile.
 if( LLVM_USE_OPROFILE )
   if( NOT CMAKE_SYSTEM_NAME MATCHES "Linux" )
Index: cmake/modules/AddLLVM.cmake
===================================================================
--- cmake/modules/AddLLVM.cmake
+++ cmake/modules/AddLLVM.cmake
@@ -580,6 +580,7 @@
 
   if(ARG_SHARED OR ARG_MODULE)
     llvm_externalize_debuginfo(${name})
+    llvm_codesign(${name})
   endif()
 endfunction()
 
@@ -784,6 +785,8 @@
     # API for all shared libaries loaded by this executable.
     target_link_libraries(${name} PRIVATE ${LLVM_PTHREAD_LIB})
   endif()
+
+  llvm_codesign(${name})
 endmacro(add_llvm_executable name)
 
 function(export_executable_symbols target)
@@ -1590,6 +1593,32 @@
   endif()
 endfunction()
 
+function(llvm_codesign name)
+  if(NOT LLVM_CODESIGNING_IDENTITY)
+    return()
+  endif()
+
+  if(APPLE)
+    if(NOT CMAKE_CODESIGN)
+      set(CMAKE_CODESIGN xcrun codesign)
+    endif()
+    if(NOT CMAKE_CODESIGN_ALLOCATE)
+      execute_process(
+        COMMAND xcrun -f codesign_allocate
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+        OUTPUT_VARIABLE CMAKE_CODESIGN_ALLOCATE
+      )
+    endif()
+    add_custom_command(
+      TARGET ${name} POST_BUILD
+      COMMAND ${CMAKE_COMMAND} -E
+              env CODESIGN_ALLOCATE=${CMAKE_CODESIGN_ALLOCATE}
+              ${CMAKE_CODESIGN} -s ${LLVM_CODESIGNING_IDENTITY}
+              $<TARGET_FILE:${name}>
+    )
+  endif()
+endfunction()
+
 function(llvm_setup_rpath name)
   if(CMAKE_INSTALL_RPATH)
     return()
Index: cmake/platforms/iOS.cmake
===================================================================
--- cmake/platforms/iOS.cmake
+++ cmake/platforms/iOS.cmake
@@ -80,3 +80,23 @@
   SET(CMAKE_LIBTOOL ${CMAKE_LIBTOOL_val} CACHE FILEPATH "Libtool")
   message(STATUS "Using libtool ${CMAKE_LIBTOOL}")
 ENDIF()
+
+IF(NOT CMAKE_CODESIGN)
+  execute_process(COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find codesign
+   OUTPUT_VARIABLE CMAKE_CODESIGN_val
+   ERROR_QUIET
+   OUTPUT_STRIP_TRAILING_WHITESPACE)
+  SET(CMAKE_CODESIGN ${CMAKE_CODESIGN_val} CACHE FILEPATH "Codesign")
+  message(STATUS "Using codesign ${CMAKE_CODESIGN}")
+ENDIF()
+
+IF(NOT CMAKE_CODESIGN_ALLOCATE)
+  execute_process(
+    COMMAND xcrun -sdk ${CMAKE_OSX_SYSROOT} -find codesign_allocate
+    OUTPUT_VARIABLE CMAKE_CODESIGN_ALLOCATE_val
+    ERROR_QUIET
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+  SET(CMAKE_CODESIGN_ALLOCATE ${CMAKE_CODESIGN_ALLOCATE_val} CACHE
+      FILEPATH "Codesign_Allocate")
+  message(STATUS "Using codesign_allocate ${CMAKE_CODESIGN_ALLOCATE}")
+ENDIF()