[CMake] Always build debugserver on Darwin and allow tests to use the system's one

[sgraenitz]

Summary

We can always build debugserver, but we can't always sign it to be useable for testing. LLDB_USE_SYSTEM_DEBUGSERVER should only tell whether or not the system debugserver should be used for testing.
The old behavior complicated the logic around debugserver a lot. The new logic sorts out most of it.

Please note that this patch is in early stage and needs some more testing. It should not affect platfroms other than Darwin. It builds on Davide's approach to validate the code-signing identity at configuration time.

What do you think?

[sgraenitz]

Minor fixes

[sgraenitz]

lldb/CMakeLists.txt

94

The target will always exist now. The dependency would now depend on LLDB_USE_SYSTEM_DEBUGSERVER and set in lldb/test/CMakeLists.txt.

lldb/tools/debugserver/source/CMakeLists.txt

86

The option may move to LLDBConfig.cmake? Actually, it affects not only the debugserver target, but also test configuration.

258

Removing the if() ... endif() would bloat the diff even more. Would do it in a follow-up NFC commit.

[sgraenitz]

Don't pass ON/OFF for LLDB_SERVER_IS_DEBUGSERVER as it becomes as #define

[xiaobai]

I think that this is a good change overall to do but the name LLDB_USE_SYSTEM_DEBUGSERVER is kind of a confusing to me. The name itself doesn't really convey to me that the system debugserver is going to be used for just testing. Before this change, that flag indicated that the system debugserver was going to be used for everything. Maybe you could change it to something like LLDB_TEST_WITH_SYSTEM_DEBUGSERVER?

[sgraenitz]

That's a fair point. However, changing the name of the parameter would force us to update quite a number of bot configurations, caches and documentation. So if it's "acceptable" I would be in favor to keep LLDB_USE_SYSTEM_DEBUGSERVER.
Also it's kind-of in line with the (internal) LLDB_CAN_USE_DEBUGSERVER and LLDB_CAN_USE_LLDB_SERVER variables.

[compnerd]

lldb/cmake/modules/AddLLDB.cmake

292

Can you add a comment explaining that you want to strip leading whitespace? Alternatively, if its trailing whitespace, please use OUTPUT_STRIP_TRAILING_WHITESPACE in the execute_process on L288 please.

293

I think that subdir is a misleading name. This is the path to debugserver, subdir should be LLDB.framework/Resources. I don't really have an opinion on renaming the variable or composing the variable, that choice is yours :-)

lldb/tools/debugserver/source/CMakeLists.txt

258

Sure, although ignoring whitespace also is helpful :-)

lldb/unittests/CMakeLists.txt

83

Shouldn't debugserver not be available always? It doesn't matter if it isn't being used. Furthermore, elision from the distribution targets will also prevent the unnecessary build so there is no need to worry about the default builds being longer than necessary.

lldb/unittests/tools/lldb-server/CMakeLists.txt

16–22

Why is this being checked in lldb-server?

20

Should this not be debugserver?

[sgraenitz]

Address Saleem's feedback

[sgraenitz]

Thanks for taking a look.

lldb/cmake/modules/AddLLDB.cmake

292

It's been there before and I think it may strip a trailing newline. Went with the execute_process variant.

lldb/unittests/CMakeLists.txt

83

Shouldn't debugserver not be available always?

This is the directory for debugserver unittests.

lldb/unittests/tools/lldb-server/CMakeLists.txt

16–22

It sets LLDB_SERVER_IS_DEBUGSERVER

[sgraenitz]

I did some more testing and from my point of view this seems to work. If it looks acceptable to you, I would like to land it tomorrow (CEST) before the 9.0 branch cut.

[xiaobai]

lldb/trunk/tools/debugserver/source/CMakeLists.txt

50 ↗

(On Diff #210546)

Could we actually preserve LLDB_NO_DEBUGSERVER? After pulling this patch down into my tree and modifying my caches, I realize that I never really change or test debugserver and would like to avoid building it at all.

[sgraenitz]

lldb/trunk/tools/debugserver/source/CMakeLists.txt

50 ↗

(On Diff #210546)

This should be equivalent to -DLLDB_TOOL_DEBUGSERVER_BUILD=OFF

[sgraenitz]

lldb/trunk/tools/debugserver/source/CMakeLists.txt

50 ↗

(On Diff #210546)

Ok this is a different issue. I guess we should align these:

if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
  add_subdirectory(darwin-debug)
  add_subdirectory(debugserver)
endif()

if (LLDB_CAN_USE_LLDB_SERVER)
  add_lldb_tool_subdirectory(lldb-server)
endif()

[sgraenitz]

lldb/trunk/tools/debugserver/source/CMakeLists.txt

50 ↗

(On Diff #210546)

https://reviews.llvm.org/D64994

lldb/CMakeLists.txt

if(LLDB_INCLUDE_TESTS)
 
   # lldb-test is an hard dependency for the testsuite.
   list(APPEND LLDB_TEST_DEPS lldb-test)
 
   if(TARGET lldb-server)
     list(APPEND LLDB_TEST_DEPS lldb-server)
   endif()
 
-  if(TARGET debugserver)
-    list(APPEND LLDB_TEST_DEPS debugserver)
-  endif()
-
   if(TARGET lldb-mi)
     list(APPEND LLDB_TEST_DEPS lldb-mi)
   endif()
 
   if(TARGET lldb-vscode)
     list(APPEND LLDB_TEST_DEPS lldb-vscode)
   endif()
 

lldb/cmake/modules/AddLLDB.cmake

 function(lldb_setup_rpaths name)
   cmake_parse_arguments(LIST "" "" "BUILD_RPATH;INSTALL_RPATH" ${ARGN})
   set_target_properties(${name} PROPERTIES
     BUILD_WITH_INSTALL_RPATH OFF
     BUILD_RPATH "${LIST_BUILD_RPATH}"
     INSTALL_RPATH "${LIST_INSTALL_RPATH}"
   )
 endfunction()
+
+function(lldb_find_system_debugserver path)
+  execute_process(COMMAND xcode-select -p
+                  RESULT_VARIABLE exit_code
+                  OUTPUT_VARIABLE xcode_dev_dir
+                  ERROR_VARIABLE error_msg
+                  OUTPUT_STRIP_TRAILING_WHITESPACE)
+  if(exit_code)
+    message(WARNING "`xcode-select -p` failed:\n${error_msg}")
+  else()
+    set(subpath "LLDB.framework/Resources/debugserver")
+    set(path_shared "${xcode_dev_dir}/../SharedFrameworks/${subpath}")
+    set(path_private "${xcode_dev_dir}/Library/PrivateFrameworks/${subpath}")
+
+    if(EXISTS ${path_shared})
+      set(${path} ${path_shared} PARENT_SCOPE)
+    elseif(EXISTS ${path_private})
+      set(${path} ${path_private} PARENT_SCOPE)
+    else()
+      message(WARNING "System debugserver requested, but not found. "
+                      "Candidates don't exist: ${path_shared}\n${path_private}")
+    endif()
+  endif()
+endfunction()

lldb/cmake/modules/LLDBConfig.cmake

 option(LLDB_DISABLE_PYTHON "Disable Python scripting integration." ${default_disable_python})
 option(LLDB_DISABLE_CURSES "Disable Curses integration." ${default_disable_curses})
 option(LLDB_DISABLE_LIBEDIT "Disable the use of editline." ${default_disable_libedit})
 option(LLDB_RELOCATABLE_PYTHON "Use the PYTHONHOME environment variable to locate Python." OFF)
 option(LLDB_USE_SYSTEM_SIX "Use six.py shipped with system and do not install a copy of it" OFF)
 option(LLDB_USE_ENTITLEMENTS "When codesigning, use entitlements if available" ON)
 option(LLDB_BUILD_FRAMEWORK "Build LLDB.framework (Darwin only)" OFF)
 option(LLDB_NO_INSTALL_DEFAULT_RPATH "Disable default RPATH settings in binaries" OFF)
+option(LLDB_USE_SYSTEM_DEBUGSERVER "Use the system's debugserver for testing (Darwin only)." OFF)
 
 if(LLDB_BUILD_FRAMEWORK)
   if(NOT APPLE)
     message(FATAL_ERROR "LLDB.framework can only be generated when targeting Apple platforms")
   endif()
   # CMake 3.6 did not correctly emit POST_BUILD commands for Apple Framework targets
   # CMake < 3.8 did not have the BUILD_RPATH target property
   if(CMAKE_VERSION VERSION_LESS 3.8)

lldb/test/CMakeLists.txt

if (LLDB_TEST_DEBUG_TEST_CRASHES)
     set(LLDB_TEST_COMMON_ARGS ${LLDB_TEST_COMMON_ARGS} --enable-crash-dialog)
   endif()
 
   if (NOT LLDB_TEST_HIDE_CONSOLE_WINDOWS)
     set(LLDB_TEST_COMMON_ARGS ${LLDB_TEST_COMMON_ARGS} --show-inferior-console)
   endif()
 endif()
 
-if(LLDB_CODESIGN_IDENTITY_USED)
-  list(APPEND LLDB_TEST_COMMON_ARGS --codesign-identity "${LLDB_CODESIGN_IDENTITY_USED}")
-endif()
-
-if(LLDB_BUILD_FRAMEWORK)
-  get_target_property(framework_target_dir liblldb LIBRARY_OUTPUT_DIRECTORY)
-  list(APPEND LLDB_TEST_COMMON_ARGS --framework ${framework_target_dir}/LLDB.framework)
-endif()
-
 if (NOT ${CMAKE_SYSTEM_NAME} MATCHES "Windows|Darwin")
   list(APPEND LLDB_TEST_COMMON_ARGS
     --env ARCHIVER=${CMAKE_AR} --env OBJCOPY=${CMAKE_OBJCOPY})
 endif()
 
 if (NOT "${LLDB_LIT_TOOLS_DIR}" STREQUAL "")
   if (NOT EXISTS "${LLDB_LIT_TOOLS_DIR}")
     message(WARNING "LLDB_LIT_TOOLS_DIR ${LLDB_LIT_TOOLS_DIR} does not exist.")
   endif()
 endif()
 
-if(CMAKE_HOST_APPLE AND DEBUGSERVER_PATH)
-  list(APPEND LLDB_TEST_COMMON_ARGS --server ${DEBUGSERVER_PATH})
+if(CMAKE_HOST_APPLE)
+  if(LLDB_BUILD_FRAMEWORK)
+    get_target_property(framework_build_dir liblldb LIBRARY_OUTPUT_DIRECTORY)
+    list(APPEND LLDB_TEST_COMMON_ARGS --framework ${framework_build_dir}/LLDB.framework)
+  endif()
+
+  # Use the same identity for testing
+  get_property(code_sign_identity_used GLOBAL PROPERTY LLDB_DEBUGSERVER_CODESIGN_IDENTITY)
+  if(code_sign_identity_used)
+    list(APPEND LLDB_TEST_COMMON_ARGS --codesign-identity "${code_sign_identity_used}")
   endif()
 
-if(SKIP_TEST_DEBUGSERVER)
+  if(LLDB_USE_SYSTEM_DEBUGSERVER)
+    lldb_find_system_debugserver(system_debugserver_path)
+    message(STATUS "LLDB tests use out-of-tree debugserver: ${system_debugserver_path}")
     list(APPEND LLDB_TEST_COMMON_ARGS --out-of-tree-debugserver)
+  else()
+    set(debugserver_path ${LLVM_RUNTIME_OUTPUT_INTDIR}/debugserver)
+    message(STATUS "LLDB Tests use just-built debugserver: ${debugserver_path}")
+    list(APPEND LLDB_TEST_COMMON_ARGS --server ${debugserver_path})
+    add_dependencies(lldb-test-deps debugserver)
+  endif()
 endif()
 
 set(LLDB_DOTEST_ARGS ${LLDB_TEST_COMMON_ARGS};${LLDB_TEST_USER_ARGS})
 set_property(GLOBAL PROPERTY LLDB_DOTEST_ARGS_PROPERTY ${LLDB_DOTEST_ARGS})
 
 add_python_test_target(check-lldb-single
   ${LLDB_SOURCE_DIR}/test/dotest.py
   "--no-multiprocess;${LLDB_DOTEST_ARGS}"

lldb/tools/debugserver/source/CMakeLists.txt

 include(CheckCXXCompilerFlag)
 include(CheckLibraryExists)
 include_directories(${CMAKE_CURRENT_BINARY_DIR}/..)
 include_directories(${LLDB_SOURCE_DIR}/source)
 include_directories(MacOSX/DarwinLog)
 
 include_directories(MacOSX)
 
+function(check_certificate identity result_valid)
+  execute_process(
+    COMMAND security find-certificate -Z -p -c ${identity} /Library/Keychains/System.keychain
+    RESULT_VARIABLE exit_code OUTPUT_QUIET ERROR_QUIET)
+  if(exit_code)
+    set(${result_valid} FALSE PARENT_SCOPE)
+  else()
+    set(${result_valid} TRUE PARENT_SCOPE)
+  endif()
+endfunction()
+
+function(get_debugserver_codesign_identity result)
+  string(CONCAT not_found_help
+    "This will cause failures in the test suite."
+    "Pass '-DLLDB_USE_SYSTEM_DEBUGSERVER=ON' to use the system one instead."
+    "See 'Code Signing on macOS' in the documentation."
+  )
+
+  # Explicit override: warn if unavailable
+  if(LLDB_CODESIGN_IDENTITY)
+    set(${result} ${LLDB_CODESIGN_IDENTITY} PARENT_SCOPE)
+    check_certificate(${LLDB_CODESIGN_IDENTITY} available)
+    if(NOT available AND NOT LLDB_USE_SYSTEM_DEBUGSERVER)
+      message(WARNING "LLDB_CODESIGN_IDENTITY not found: '${LLDB_CODESIGN_IDENTITY}' ${not_found_help}")
+    endif()
+    return()
+  endif()
+
+  # Development signing identity: use if available
+  check_certificate(lldb_codesign available)
+  if(available)
+    set(${result} lldb_codesign PARENT_SCOPE)
+    return()
+  endif()
+
+  if(NOT LLDB_USE_SYSTEM_DEBUGSERVER)
+    message(WARNING "Development code sign identiy not found: 'lldb_codesign' ${not_found_help}")
+  endif()
+
+  # LLVM pendant: fallback if available
+  if(LLVM_CODESIGNING_IDENTITY)
+    check_certificate(${LLVM_CODESIGNING_IDENTITY} available)
+    if(available)
+      set(${result} ${LLVM_CODESIGNING_IDENTITY} PARENT_SCOPE)
+      return()
+    endif()
+  endif()
+
+  # Ad-hoc signing: last resort
+  set(${result} "-" PARENT_SCOPE)
+endfunction()
+
 set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -stdlib=libc++ -Wl,-sectcreate,__TEXT,__info_plist,${CMAKE_CURRENT_SOURCE_DIR}/../resources/lldb-debugserver-Info.plist")
 
 check_cxx_compiler_flag("-Wno-gnu-zero-variadic-macro-arguments"
                         CXX_SUPPORTS_NO_GNU_ZERO_VARIADIC_MACRO_ARGUMENTS)
 if (CXX_SUPPORTS_NO_GNU_ZERO_VARIADIC_MACRO_ARGUMENTS)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-gnu-zero-variadic-macro-arguments")
 endif ()
 
 check_cxx_compiler_flag("-Wno-zero-length-array"
                         CXX_SUPPORTS_NO_ZERO_LENGTH_ARRAY)
 if (CXX_SUPPORTS_NO_ZERO_LENGTH_ARRAY)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-zero-length-array")
 endif ()
 
 check_cxx_compiler_flag("-Wno-extended-offsetof"
                         CXX_SUPPORTS_NO_EXTENDED_OFFSETOF)
 if (CXX_SUPPORTS_NO_EXTENDED_OFFSETOF)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-extended-offsetof")
 endif ()
 
 check_library_exists(compression compression_encode_buffer "" HAVE_LIBCOMPRESSION)
 
 add_subdirectory(MacOSX)
 
-# LLDB-specific identity, currently used for code signing debugserver.
 set(LLDB_CODESIGN_IDENTITY "" CACHE STRING
-    "Override code sign identity for debugserver and for use in tests; falls back to LLVM_CODESIGNING_IDENTITY if set or lldb_codesign otherwise (Darwin only)")
+    "Identity override for debugserver; see 'Code Signing on macOS' in the documentation (Darwin only)")
 
-# Determine which identity to use and store it in the separate cache entry.
-# We will query it later for LLDB_TEST_COMMON_ARGS.
-if(LLDB_CODESIGN_IDENTITY)
-  set(LLDB_CODESIGN_IDENTITY_USED ${LLDB_CODESIGN_IDENTITY} CACHE INTERNAL "" FORCE)
-elseif(LLVM_CODESIGNING_IDENTITY)
-  set(LLDB_CODESIGN_IDENTITY_USED ${LLVM_CODESIGNING_IDENTITY} CACHE INTERNAL "" FORCE)
-else()
-  set(LLDB_CODESIGN_IDENTITY_USED lldb_codesign CACHE INTERNAL "" FORCE)
-endif()
+get_debugserver_codesign_identity(debugserver_codesign_identity)
 
 # Override locally, so the identity is used for targets created in this scope.
-set(LLVM_CODESIGNING_IDENTITY ${LLDB_CODESIGN_IDENTITY_USED})
-
-option(LLDB_NO_DEBUGSERVER "Disable the debugserver target" OFF)
-option(LLDB_USE_SYSTEM_DEBUGSERVER "Use the system's debugserver instead of building it from source (Darwin only)." OFF)
+set(LLVM_CODESIGNING_IDENTITY ${debugserver_codesign_identity})
 
-# Incompatible options
-if(LLDB_NO_DEBUGSERVER AND LLDB_USE_SYSTEM_DEBUGSERVER)
-  message(FATAL_ERROR "Inconsistent options: LLDB_NO_DEBUGSERVER and LLDB_USE_SYSTEM_DEBUGSERVER")
-endif()
-
-# Try to locate the system debugserver.
-# Subsequent feasibility checks depend on it.
-if(APPLE AND CMAKE_HOST_APPLE)
-  execute_process(
-    COMMAND xcode-select -p
-    OUTPUT_VARIABLE xcode_dev_dir)
-  string(STRIP ${xcode_dev_dir} xcode_dev_dir)
-
-  set(debugserver_rel_path "LLDB.framework/Resources/debugserver")
-  set(debugserver_shared "${xcode_dev_dir}/../SharedFrameworks/${debugserver_rel_path}")
-  set(debugserver_private "${xcode_dev_dir}/Library/PrivateFrameworks/${debugserver_rel_path}")
-
-  if(EXISTS ${debugserver_shared})
-    set(system_debugserver ${debugserver_shared})
-  elseif(EXISTS ${debugserver_private})
-    set(system_debugserver ${debugserver_private})
-  endif()
-endif()
-
-# Handle unavailability
-if(LLDB_USE_SYSTEM_DEBUGSERVER)
-  if(system_debugserver)
-    set(use_system_debugserver ON)
-  elseif(APPLE AND CMAKE_HOST_APPLE)
-    # Binary not found on system. Keep cached variable, to try again on reconfigure.
-    message(SEND_ERROR
-      "LLDB_USE_SYSTEM_DEBUGSERVER option set, but no debugserver found in:\
-        ${debugserver_shared}\
-        ${debugserver_private}")
-  else()
-    # Non-Apple target platform or non-Darwin host. Reset invalid cached variable.
-    message(WARNING "Reverting invalid option LLDB_USE_SYSTEM_DEBUGSERVER (Darwin only)")
-    set(LLDB_USE_SYSTEM_DEBUGSERVER OFF CACHE BOOL "" FORCE)
-  endif()
-elseif(NOT LLDB_NO_DEBUGSERVER)
-  # Default case: on Darwin we need the right code signing ID.
-  # See lldb/docs/code-signing.txt for details.
-  if(CMAKE_HOST_APPLE AND NOT LLVM_CODESIGNING_IDENTITY STREQUAL "lldb_codesign")
-    message(WARNING "Codesigning debugserver with identity ${LLVM_CODESIGNING_IDENTITY}. "
-                    "The usual setup uses the \"lldb_codesign\" identity created with "
-                    "scripts/macos-setup-codesign.sh. As a result your debugserver might "
-                    "not be able to attach to processes.\n"
-                    "Pass -DLLDB_CODESIGN_IDENTITY=lldb_codesign to use the development "
-                    "signing identity.")
-  endif()
-  set(build_and_sign_debugserver ON)
-endif()
-
-# TODO: We don't use the $<TARGET_FILE:debugserver> generator expression here,
-# because the value of DEBUGSERVER_PATH is used to build LLDB_DOTEST_ARGS,
-# which is used for configuring lldb-dotest.in, which does not have a generator
-# step at the moment.
-set(default_debugserver_path "${LLVM_RUNTIME_OUTPUT_INTDIR}/debugserver${CMAKE_EXECUTABLE_SUFFIX}")
-
-# Remember where debugserver binary goes and whether or not we have to test it.
-set(DEBUGSERVER_PATH "" CACHE FILEPATH "Path to debugserver")
-set(SKIP_TEST_DEBUGSERVER OFF CACHE BOOL "Building the in-tree debugserver was skipped")
-
-# Reset values in all cases in order to correctly support reconfigurations.
-if(use_system_debugserver)
-  add_custom_target(debugserver
-    COMMAND ${CMAKE_COMMAND} -E copy_if_different
-            ${system_debugserver} ${LLVM_RUNTIME_OUTPUT_INTDIR}
-    COMMENT "Copying the system debugserver to LLDB's binaries directory.")
-
-  set_target_properties(debugserver PROPERTIES FOLDER "lldb libraries/debugserver")
-
-  # Don't test debugserver itself.
-  # Tests that require debugserver will use the copy.
-  set(DEBUGSERVER_PATH ${default_debugserver_path} CACHE FILEPATH "" FORCE)
-  set(SKIP_TEST_DEBUGSERVER ON CACHE BOOL "" FORCE)
-
-  message(STATUS "Copy system debugserver from: ${system_debugserver}")
-elseif(build_and_sign_debugserver)
-  # Build, sign and test debugserver (below)
-  set(DEBUGSERVER_PATH ${default_debugserver_path} CACHE FILEPATH "" FORCE)
-  set(SKIP_TEST_DEBUGSERVER OFF CACHE BOOL "" FORCE)
-
-  message(STATUS "lldb debugserver: ${DEBUGSERVER_PATH}")
-else()
-  # No tests for debugserver, no tests that require it.
-  set(DEBUGSERVER_PATH "" CACHE FILEPATH "" FORCE)
-  set(SKIP_TEST_DEBUGSERVER ON CACHE BOOL "" FORCE)
-
-  message(STATUS "lldb debugserver will not be available.")
-endif()
-
-# On MacOS, debugserver needs to be codesigned when built. Check if we have
-# a certificate instead of failing in the middle of the build.
-if(build_and_sign_debugserver)
-  execute_process(
-    COMMAND security find-certificate -Z -p -c ${LLDB_CODESIGN_IDENTITY_USED} /Library/Keychains/System.keychain
-    RESULT_VARIABLE cert_return
-    OUTPUT_QUIET
-    ERROR_QUIET)
-
-  if (cert_return)
-    message(FATAL_ERROR "Certificate for debugserver not found. Run scripts/macos-setup-codesign.sh or "
-                        "use the system debugserver passing -DLLDB_USE_SYSTEM_DEBUGSERVER=ON to CMake")
-  endif()
-endif()
+# Use the same identity later in the test suite.
+set_property(GLOBAL PROPERTY
+  LLDB_DEBUGSERVER_CODESIGN_IDENTITY ${debugserver_codesign_identity})
 
 if(APPLE)
   if(IOS)
     find_library(BACKBOARD_LIBRARY BackBoardServices
       PATHS ${CMAKE_OSX_SYSROOT}/System/Library/PrivateFrameworks)
     find_library(FRONTBOARD_LIBRARY FrontBoardServices
       PATHS ${CMAKE_OSX_SYSROOT}/System/Library/PrivateFrameworks)
     find_library(SPRINGBOARD_LIBRARY SpringBoardServices
if(LLDB_USE_ENTITLEMENTS)
   if(IOS)
     set(entitlements ${CMAKE_CURRENT_SOURCE_DIR}/debugserver-entitlements.plist)
   else()
     # Same entitlements file as used for lldb-server
     set(entitlements ${LLDB_SOURCE_DIR}/resources/debugserver-macosx-entitlements.plist)
   endif()
 endif()
 
-if(build_and_sign_debugserver)
+#if(build_and_sign_debugserver)
   set(generated_mach_interfaces
     ${CMAKE_CURRENT_BINARY_DIR}/mach_exc.h
     ${CMAKE_CURRENT_BINARY_DIR}/mach_excServer.c
     ${CMAKE_CURRENT_BINARY_DIR}/mach_excUser.c
     )
   add_custom_command(OUTPUT ${generated_mach_interfaces}
     COMMAND mig ${CMAKE_CURRENT_SOURCE_DIR}/MacOSX/dbgnub-mig.defs
     DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/MacOSX/dbgnub-mig.defs
add_lldb_tool(debugserver-nonui
 
       LINK_LIBS
         lldbDebugserverCommon_NonUI
 
       ENTITLEMENTS
         ${entitlements}
       )
   endif()
-endif()
+#endif()

lldb/unittests/CMakeLists.txt

 add_subdirectory(Signals)
 add_subdirectory(Symbol)
 add_subdirectory(SymbolFile)
 add_subdirectory(Target)
 add_subdirectory(tools)
 add_subdirectory(UnwindAssembly)
 add_subdirectory(Utility)
 
-if(LLDB_CAN_USE_DEBUGSERVER AND NOT SKIP_TEST_DEBUGSERVER)
+if(LLDB_CAN_USE_DEBUGSERVER AND NOT LLDB_USE_SYSTEM_DEBUGSERVER)
   add_subdirectory(debugserver)
 endif()

lldb/unittests/tools/lldb-server/CMakeLists.txt

 set(ALL_LLDB_TEST_EXECUTABLES)
 
 function(add_lldb_test_executable test_name)
   set(EXCLUDE_FROM_ALL ON)
   add_llvm_executable(${test_name} NO_INSTALL_RPATH ${ARGN})
   set(outdir ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR})
   set_output_directory(${test_name} BINARY_DIR ${outdir} LIBRARY_DIR ${outdir})
   list(APPEND ALL_LLDB_TEST_EXECUTABLES ${test_name})
   set(ALL_LLDB_TEST_EXECUTABLES ${ALL_LLDB_TEST_EXECUTABLES} PARENT_SCOPE)
   set_target_properties(${test_name} PROPERTIES FOLDER "lldb tests")
 endfunction()
 
 add_lldb_test_executable(thread_inferior inferior/thread_inferior.cpp)
 add_lldb_test_executable(environment_check inferior/environment_check.cpp)
 
-if(DEBUGSERVER_PATH)
-  add_definitions(-DLLDB_SERVER="${DEBUGSERVER_PATH}" -DLLDB_SERVER_IS_DEBUGSERVER=1)
+if(LLDB_CAN_USE_DEBUGSERVER)
+  if(LLDB_USE_SYSTEM_DEBUGSERVER)
+    lldb_find_system_debugserver(debugserver_path)
+  else()
+    set(debugserver_path $<TARGET_FILE:debugserver>)
+  endif()
+  add_definitions(-DLLDB_SERVER="${debugserver_path}" -DLLDB_SERVER_IS_DEBUGSERVER=1)
 else()
   add_definitions(-DLLDB_SERVER="$<TARGET_FILE:lldb-server>" -DLLDB_SERVER_IS_DEBUGSERVER=0)
 endif()
 
 add_definitions(
   -DLLDB_TEST_INFERIOR_PATH="${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}"
   -DLLDB_TEST_INFERIOR_SUFFIX="${CMAKE_EXECUTABLE_SUFFIX}"
   )
 add_subdirectory(tests)