[PATCH] Add cmake flag LLVM_USE_SANITIZE_COVERAGE

[Kostya Serebryany]

Hi rnk,

When LLVM_USE_SANITIZE_COVERAGE=YES
and one of the sanitizers is used -fsanitize-coverage=3 will be added
to build flag. This will be used to run a coverage-guided fuzzer on various
llvm libraries.

http://reviews.llvm.org/D7116

Files:
  cmake/modules/HandleLLVMOptions.cmake

Index: cmake/modules/HandleLLVMOptions.cmake
===================================================================
--- cmake/modules/HandleLLVMOptions.cmake
+++ cmake/modules/HandleLLVMOptions.cmake
@@ -401,6 +401,9 @@
   else()
     message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
   endif()
+  if (LLVM_USE_SANITIZE_COVERAGE)
+    append("-fsanitize-coverage=3" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+  endif()
 endif()
 
 # Turn on -gsplit-dwarf if requested

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