[unittests] Disable lldb-server tests if an external debug server is in use

The lldb-server unit tests don't test the right thing when the debug
server in use is copied from somewhere else. This can lead to spurious
test failures.

Disable these unit tests when an external debug server is in use.

Fixes llvm.org/PR36494.

llvm-svn: 326001

lldb/tools/debugserver/source/CMakeLists.txt

@@ -100,6 +100,7 @@ set(LLDB_CODESIGN_IDENTITY "lldb_codesign"
 
 if(NOT LLDB_CODESIGN_IDENTITY STREQUAL "")
   set(DEBUGSERVER_PATH $<TARGET_FILE:debugserver> CACHE PATH "Path to debugserver.")
+  set(SKIP_DEBUGSERVER OFF CACHE BOOL "Skip building the in-tree debug server")
 else()
   execute_process(
     COMMAND xcode-select -p
@@ -107,7 +108,7 @@ else()
   string(STRIP ${XCODE_DEV_DIR} XCODE_DEV_DIR)
   set(DEBUGSERVER_PATH
     "${XCODE_DEV_DIR}/../SharedFrameworks/LLDB.framework/Resources/debugserver" CACHE PATH "Path to debugserver.")
-  set(SKIP_DEBUGSERVER True)
+  set(SKIP_DEBUGSERVER ON CACHE BOOL "Skip building the in-tree debug server")
 endif()
 message(STATUS "Path to the lldb debugserver: ${DEBUGSERVER_PATH}")
 
@@ -124,7 +125,7 @@ if (APPLE)
     find_library(LOCKDOWN_LIBRARY lockdown)
 
     if(NOT BACKBOARD_LIBRARY)
-      set(SKIP_DEBUGSERVER True)
+      set(SKIP_DEBUGSERVER ON CACHE BOOL "Skip building the in-tree debug server" FORCE)
     endif()
   else()
     find_library(COCOA_LIBRARY Cocoa)

lldb/unittests/tools/CMakeLists.txt

@@ -1,3 +1,8 @@
 if(CMAKE_SYSTEM_NAME MATCHES "Android|Darwin|Linux|NetBSD")
-  add_subdirectory(lldb-server)
+  if (CMAKE_SYSTEM_NAME MATCHES "Darwin" AND SKIP_DEBUGSERVER)
+    # These tests are meant to test lldb-server/debugserver in isolation, and
+    # don't provide any value if run against a server copied from somewhere.
+  else()
+    add_subdirectory(lldb-server)
+  endif()
 endif()