Index: llvm/CMakeLists.txt
===================================================================
--- llvm/CMakeLists.txt
+++ llvm/CMakeLists.txt
@@ -513,6 +513,10 @@
   option(LLVM_BUILD_32_BITS "Build 32 bits executables and libraries." OFF)
 endif()
 
+if(NOT WIN32)
+  option(LLVM_BUILD_CET_ENABLE "Build executables and libraries with CET enabled." OFF)
+endif()
+
 # Define the default arguments to use with 'lit', and an option for the user to
 # override.
 set(LIT_ARGS_DEFAULT "-sv")
Index: llvm/cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- llvm/cmake/modules/HandleLLVMOptions.cmake
+++ llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -366,6 +366,17 @@
   endif( LLVM_BUILD_32_BITS )
 endif( CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT WIN32 )
 
+# To enable CET in compilation, "-fcf-protection=full" should
+# be added. Currently, CET has been implemented in x86 GNU/Linux target.
+if(NOT WIN32)
+  if( LLVM_BUILD_CET_ENABLE)
+    add_flag_if_supported("-fcf-protection=full" CET)
+    if((NOT C_SUPPORTS_CET) OR (NOT CXX_SUPPORTS_CET))
+      message(FATAL_ERROR "The compiler used for building doesn't support CET!")
+    endif()
+  endif( LLVM_BUILD_CET_ENABLE)
+endif()
+
 # If building on a GNU specific 32-bit system, make sure off_t is 64 bits
 # so that off_t can stored offset > 2GB.
 # Android until version N (API 24) doesn't support it.
Index: llvm/cmake/modules/LLVMConfig.cmake.in
===================================================================
--- llvm/cmake/modules/LLVMConfig.cmake.in
+++ llvm/cmake/modules/LLVMConfig.cmake.in
@@ -74,6 +74,8 @@
 
 set(LLVM_BUILD_32_BITS @LLVM_BUILD_32_BITS@)
 
+set(LLVM_BUILD_CET_ENABLE @LLVM_BUILD_CET_ENABLE@)
+
 if (NOT "@LLVM_PTHREAD_LIB@" STREQUAL "")
   set(LLVM_PTHREAD_LIB "@LLVM_PTHREAD_LIB@")
 endif()
Index: llvm/docs/CMake.rst
===================================================================
--- llvm/docs/CMake.rst
+++ llvm/docs/CMake.rst
@@ -250,6 +250,10 @@
   Build 32-bit executables and libraries on 64-bit systems. This option is
   available only on some 64-bit Unix systems. Defaults to OFF.
 
+**LLVM_BUILD_CET_ENABLE**:BOOL
+  Build executables and libraries with CET enabled. CET is currently implemented
+  in x86 GNU/Linux target. Defaults to OFF.
+
 **LLVM_BUILD_BENCHMARKS**:BOOL
   Adds benchmarks to the list of default targets. Defaults to OFF.