[CMake] Add mapping for IBM XL -qnoeh and -qnortti

Summary:
This patch maps in the `-qnoeh` and `-qnortti` options for building with
IBM XL compilers.

Reviewers: daltenty, xingxue, jasonliu

Reviewed By: daltenty

Subscribers: mgorny, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D65669

llvm-svn: 368050

Author: hubert-reinterpretcast

llvm/cmake/modules/AddLLVM.cmake

@@ -28,6 +28,8 @@ function(llvm_update_compile_flags name)
     elseif(MSVC)
       list(APPEND LLVM_COMPILE_DEFINITIONS _HAS_EXCEPTIONS=0)
       list(APPEND LLVM_COMPILE_FLAGS "/EHs-c-")
+    elseif (CMAKE_CXX_COMPILER_ID MATCHES "XL")
+      list(APPEND LLVM_COMPILE_FLAGS "-qnoeh")
     endif()
   endif()
 
@@ -41,6 +43,8 @@ function(llvm_update_compile_flags name)
       list(APPEND LLVM_COMPILE_FLAGS "-fno-rtti")
     elseif (MSVC)
       list(APPEND LLVM_COMPILE_FLAGS "/GR-")
+    elseif (CMAKE_CXX_COMPILER_ID MATCHES "XL")
+      list(APPEND LLVM_COMPILE_FLAGS "-qnortti")
     endif ()
   elseif(MSVC)
     list(APPEND LLVM_COMPILE_FLAGS "/GR")