Index: llvm-toolchain-10-10.0.0~+rc2/compiler-rt/lib/CMakeLists.txt
===================================================================
--- llvm-toolchain-10-10.0.0~+rc2.orig/compiler-rt/lib/CMakeLists.txt
+++ llvm-toolchain-10-10.0.0~+rc2/compiler-rt/lib/CMakeLists.txt
@@ -57,5 +57,8 @@ if(COMPILER_RT_BUILD_XRAY)
 endif()
 
 if(COMPILER_RT_BUILD_LIBFUZZER)
-  compiler_rt_build_runtime(fuzzer)
+  if(NOT(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "i386" OR CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "i686"))
+      # Disabled because of https://bugs.llvm.org/show_bug.cgi?id=43677
+      compiler_rt_build_runtime(fuzzer)
+    endif()
 endif()
Index: llvm-toolchain-10-10.0.0~+rc2/compiler-rt/test/CMakeLists.txt
===================================================================
--- llvm-toolchain-10-10.0.0~+rc2.orig/compiler-rt/test/CMakeLists.txt
+++ llvm-toolchain-10-10.0.0~+rc2/compiler-rt/test/CMakeLists.txt
@@ -55,7 +55,10 @@ if(COMPILER_RT_CAN_EXECUTE_TESTS)
 
     # OpenBSD not supporting asan, cannot run the tests
     if(COMPILER_RT_BUILD_LIBFUZZER AND NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "OpenBSD" AND NOT ANDROID)
-      compiler_rt_test_runtime(fuzzer)
+      if(NOT(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "i386" OR CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "i686"))
+        # Disabled because of https://bugs.llvm.org/show_bug.cgi?id=43677
+        compiler_rt_test_runtime(fuzzer)
+      endif()
     endif()
 
     foreach(sanitizer ${COMPILER_RT_SANITIZERS_TO_BUILD})