Index: unittests/UnwindAssembly/CMakeLists.txt
===================================================================
--- unittests/UnwindAssembly/CMakeLists.txt
+++ unittests/UnwindAssembly/CMakeLists.txt
@@ -1,2 +1,5 @@
-add_subdirectory(x86)
+if ("X86" IN_LIST LLVM_TARGETS_TO_BUILD)
+  add_subdirectory(x86)
+endif()
+
 add_subdirectory(InstEmulation)
Index: unittests/UnwindAssembly/InstEmulation/CMakeLists.txt
===================================================================
--- unittests/UnwindAssembly/InstEmulation/CMakeLists.txt
+++ unittests/UnwindAssembly/InstEmulation/CMakeLists.txt
@@ -1 +1,3 @@
-add_lldb_unittest(InstEmulationTests TestArm64InstEmulation.cpp)
+if ("AArch64" IN_LIST LLVM_TARGETS_TO_BUILD)
+  add_lldb_unittest(InstEmulationTests TestArm64InstEmulation.cpp)
+endif()