File llvm-remove-clang-only-flags.patch of Package llvm

Index: llvm-3.8.0.src/cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- llvm-3.8.0.src.orig/cmake/modules/HandleLLVMOptions.cmake
+++ llvm-3.8.0.src/cmake/modules/HandleLLVMOptions.cmake
@@ -417,7 +417,6 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE
 
     append_if(LLVM_ENABLE_PEDANTIC "-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
     append_if(LLVM_ENABLE_PEDANTIC "-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
-    add_flag_if_supported("-Wcovered-switch-default" COVERED_SWITCH_DEFAULT_FLAG)
     append_if(USE_NO_UNINITIALIZED "-Wno-uninitialized" CMAKE_CXX_FLAGS)
     append_if(USE_NO_MAYBE_UNINITIALIZED "-Wno-maybe-uninitialized" CMAKE_CXX_FLAGS)
 
@@ -454,9 +453,6 @@ elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE
     endif()
   endif (LLVM_ENABLE_WARNINGS)
   append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
-  if (NOT LLVM_ENABLE_TIMESTAMPS)
-    add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME)
-  endif ()
   if (LLVM_ENABLE_CXX1Y)
     check_cxx_compiler_flag("-std=c++1y" CXX_SUPPORTS_CXX1Y)
     append_if(CXX_SUPPORTS_CXX1Y "-std=c++1y" CMAKE_CXX_FLAGS)
@@ -578,13 +574,6 @@ add_llvm_definitions( -D__STDC_CONSTANT_
 add_llvm_definitions( -D__STDC_FORMAT_MACROS )
 add_llvm_definitions( -D__STDC_LIMIT_MACROS )
 
-# clang doesn't print colored diagnostics when invoked from Ninja
-if (UNIX AND
-    CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
-    CMAKE_GENERATOR STREQUAL "Ninja")
-  append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
-endif()
-
 # Add flags for add_dead_strip().
 # FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF?
 # But MinSizeRel seems to add that automatically, so maybe disable these