[sanitizer/coverage] Add AFL-style coverage counters (search heuristic for fuzzing).

[oota-llvm.git] / cmake / modules / HandleLLVMOptions.cmake

diff --git a/cmake/modules/HandleLLVMOptions.cmake b/cmake/modules/HandleLLVMOptions.cmake
index 3843aa83450bfbb317e49de0d9790878d19a096d..45b4d3278cb35df58d3d76322e3cfb2cd3f0866c 100644 (file)
--- a/cmake/modules/HandleLLVMOptions.cmake
+++ b/cmake/modules/HandleLLVMOptions.cmake
@@ -21,11 +21,16 @@ if(NOT LLVM_FORCE_USE_OLD_TOOLCHAIN)
       message(FATAL_ERROR "Host Clang version must be at least 3.1!")
     endif()
 
-    # Also test that we aren't using too old of a version of libstdc++ with the
-    # Clang compiler. This is tricky as there is no real way to check the
-    # version of libstdc++ directly. Instead we test for a known bug in
-    # libstdc++4.6 that is fixed in libstdc++4.7.
-    if(NOT LLVM_ENABLE_LIBCXX)
+    if (CMAKE_CXX_SIMULATE_ID MATCHES "MSVC")
+      if (CMAKE_CXX_SIMULATE_VERSION VERSION_LESS 18.0)
+        message(FATAL_ERROR "Host Clang must have at least -fms-compatibility-version=18.0")
+      endif()
+      set(CLANG_CL 1)
+    elseif(NOT LLVM_ENABLE_LIBCXX)
+      # Otherwise, test that we aren't using too old of a version of libstdc++
+      # with the Clang compiler. This is tricky as there is no real way to
+      # check the version of libstdc++ directly. Instead we test for a known
+      # bug in libstdc++4.6 that is fixed in libstdc++4.7.
       set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
       set(OLD_CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
       set(CMAKE_REQUIRED_FLAGS "-std=c++0x")
@@ -42,7 +47,10 @@ int main() { return (float)x; }"
     endif()
   elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
     if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0)
-      message(FATAL_ERROR "Host Visual Studio must be at least 2013 (MSVC 18.0)")
+      message(FATAL_ERROR "Host Visual Studio must be at least 2013")
+    elseif(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 18.0.31101)
+      message(WARNING "Host Visual Studio should at least be 2013 Update 4 (MSVC 18.0.31101)"
+        "  due to miscompiles from earlier versions")
     endif()
   endif()
 endif()
@@ -416,7 +424,7 @@ if(LLVM_USE_SANITIZER)
     message(WARNING "LLVM_USE_SANITIZER is not supported on this platform.")
   endif()
   if (LLVM_USE_SANITIZE_COVERAGE)
-    append("-fsanitize-coverage=4" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+    append("-fsanitize-coverage=4 -mllvm -sanitizer-coverage-8bit-counters=1" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
   endif()
 endif()