[CMake] Copy over the system debugserver when using LLDB_USE_SYSTEM_DEBUGSERVER

[JDevlieghere]

Summary

r366433 broke support for the system debugserver. Although the change was well-intended, it (presumably) unintentionally removed the logic to copy over the debugserver. As a result, even with LLDB_USE_SYSTEM_DEBUGSERVER enabled, we ended up building, signing and using the just-built debugserver. This patch partially recovers the old behavior: when LLDB_USE_SYSTEM_DEBUGSERVER is set we don't build debugserver and just copy over the system one.

[JDevlieghere]

Add decorator to tests that require a more recent debugserver.

[xiaobai]

lldb/test/CMakeLists.txt

103

Doesn't this now conflict with the use of --out-of-tree-debugserver added to the args below?

[JDevlieghere]

lldb/test/CMakeLists.txt

103

--out-of-tree-debugserver tells dotest that test decorated with skipIfOutOfTreeDebugserver should be skipped during this run.

[xiaobai]

No objections from me.

[aprantl]

lldb/trunk/packages/Python/lldbsuite/test/functionalities/thread/concurrent_events/TestConcurrentManyBreakpoints.py

18 ↗

(On Diff #221615)

It may be more forward-looking to check for an actual version here like we do for the compiler.

lldb/test/CMakeLists.txt

if(CMAKE_HOST_APPLE)
   # 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(LLDB_USE_SYSTEM_DEBUGSERVER)
     lldb_find_system_debugserver(system_debugserver_path)
+    add_custom_target(debugserver
+      COMMAND ${CMAKE_COMMAND} -E copy_if_different
+      ${system_debugserver_path} ${LLVM_RUNTIME_OUTPUT_INTDIR}
+      COMMENT "Copying the system debugserver to LLDB's binaries directory for testing.")
     message(STATUS "LLDB tests use out-of-tree debugserver: ${system_debugserver_path}")
     list(APPEND LLDB_TEST_COMMON_ARGS --out-of-tree-debugserver)
   elseif(TARGET debugserver)
     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)
   elseif(TARGET lldb-server)

lldb/tools/CMakeLists.txt

 add_subdirectory(argdumper)
 add_subdirectory(driver)
 add_subdirectory(intel-features)
 
 # We want lldb-test to be built only when it's needed,
 # i.e. if a target requires it as dependency. The typical
 # example is `check-lldb`. So, we pass EXCLUDE_FROM_ALL here.
 add_subdirectory(lldb-test EXCLUDE_FROM_ALL)
 
 add_lldb_tool_subdirectory(lldb-instr)
 add_lldb_tool_subdirectory(lldb-vscode)
 
 if (CMAKE_SYSTEM_NAME MATCHES "Darwin")
   add_lldb_tool_subdirectory(darwin-debug)
+  if(NOT LLDB_USE_SYSTEM_DEBUGSERVER)
     add_lldb_tool_subdirectory(debugserver)
   endif()
+endif()
 
 if (LLDB_CAN_USE_LLDB_SERVER)
   add_lldb_tool_subdirectory(lldb-server)
 endif()

lldb/tools/debugserver/source/CMakeLists.txt

string(CONCAT not_found_help
     "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)
+    if(NOT available)
       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()