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File llvm-remove-clang-only-flags.patch of Package llvm7

Index: llvm-7.0.0rc1.src/cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- llvm-7.0.0rc1.src.orig/cmake/modules/HandleLLVMOptions.cmake
+++ llvm-7.0.0rc1.src/cmake/modules/HandleLLVMOptions.cmake
@@ -407,8 +407,6 @@ if( MSVC )
 elseif( LLVM_COMPILER_IS_GCC_COMPATIBLE )
   append_if(LLVM_ENABLE_WERROR "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
   append_if(LLVM_ENABLE_WERROR "-Wno-error" CMAKE_REQUIRED_FLAGS)
-  add_flag_if_supported("-Werror=date-time" WERROR_DATE_TIME)
-  add_flag_if_supported("-Werror=unguarded-availability-new" WERROR_UNGUARDED_AVAILABILITY_NEW)
   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)
@@ -575,7 +574,6 @@ if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPI
     append("-Wno-long-long" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
   endif()
 
-  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)