[cmake] Fix LLDB_CODESIGN_IDENTITY logic.

Summary:
Consolidate LLDB_CODESIGN_IDENTITY logic in one place and use
SKIP_DEBUGSERVER, which can be set independently, to control
codesigning targets.

Currently, running cmake the first time in a clean directory, without
passing -DLLDB_CODESIGN_IDENTITY='', fails.  However, subsequent runs
succeed.  That's because LLDB_CODESIGN_IDENTITY gets added to the
CACHE after the initial test.  To fix that, the default value must be
set before it's tested.

Here's the error produced on the first run:

CMake Error at tools/lldb/tools/debugserver/source/CMakeLists.txt:215 (add_custom_command):
  No TARGET 'debugserver' has been created in this directory.

Differential Revision: https://reviews.llvm.org/D43432

llvm-svn: 325442

2 files changed, 17 insertions, 18 deletions

diff --git a/lldb/CMakeLists.txt b/lldb/CMakeLists.txt
index 72cdd55c357..bc04e9b4ae4 100644
--- a/lldb/CMakeLists.txt
+++ b/lldb/CMakeLists.txt
@@ -57,21 +57,6 @@ if (NOT LLDB_DISABLE_PYTHON)
   add_subdirectory(scripts)
 endif ()
 
-if(CMAKE_HOST_APPLE)
-  if(LLDB_CODESIGN_IDENTITY)
-    set(DEBUGSERVER_PATH $<TARGET_FILE:debugserver>)
-  else()
-    execute_process(
-      COMMAND xcode-select -p
-      OUTPUT_VARIABLE XCODE_DEV_DIR)
-    string(STRIP ${XCODE_DEV_DIR} XCODE_DEV_DIR)
-    set(DEBUGSERVER_PATH
-      "${XCODE_DEV_DIR}/../SharedFrameworks/LLDB.framework/Resources/debugserver")
-    set(SKIP_DEBUGSERVER True)
-  endif()
-  message(STATUS "Path to the lldb debugserver: ${DEBUGSERVER_PATH}")
-endif()
-
 add_subdirectory(source)
 add_subdirectory(tools)
 
diff --git a/lldb/tools/debugserver/source/CMakeLists.txt b/lldb/tools/debugserver/source/CMakeLists.txt
index e70e90923a3..377a78ab794 100644
--- a/lldb/tools/debugserver/source/CMakeLists.txt
+++ b/lldb/tools/debugserver/source/CMakeLists.txt
@@ -95,6 +95,22 @@ set(lldbDebugserverCommonSources
 add_library(lldbDebugserverCommon ${lldbDebugserverCommonSources})
 
 
+set(LLDB_CODESIGN_IDENTITY "lldb_codesign"
+  CACHE STRING "Identity used for code signing. Set to empty string to skip the signing step.")
+
+if(NOT LLDB_CODESIGN_IDENTITY STREQUAL "")
+  set(DEBUGSERVER_PATH $<TARGET_FILE:debugserver>)
+else()
+  execute_process(
+    COMMAND xcode-select -p
+    OUTPUT_VARIABLE XCODE_DEV_DIR)
+  string(STRIP ${XCODE_DEV_DIR} XCODE_DEV_DIR)
+  set(DEBUGSERVER_PATH
+    "${XCODE_DEV_DIR}/../SharedFrameworks/LLDB.framework/Resources/debugserver")
+  set(SKIP_DEBUGSERVER True)
+endif()
+message(STATUS "Path to the lldb debugserver: ${DEBUGSERVER_PATH}")
+
 if (APPLE)
   if(IOS)
     find_library(BACKBOARD_LIBRARY BackBoardServices
@@ -187,15 +203,13 @@ if(IOS)
   set(entitlements_xml ${CMAKE_CURRENT_SOURCE_DIR}/debugserver-entitlements.plist)
 endif()
 
-set(LLDB_CODESIGN_IDENTITY "lldb_codesign"
-  CACHE STRING "Identity used for code signing. Set to empty string to skip the signing step.")
 set(LLDB_USE_ENTITLEMENTS_Default On)
 if("${LLDB_CODESIGN_IDENTITY}" STREQUAL "lldb_codesign")
   set(LLDB_USE_ENTITLEMENTS_Default Off)
 endif()
 option(LLDB_USE_ENTITLEMENTS "Use entitlements when codesigning (Defaults Off when using lldb_codesign identity, otherwise On)" ${LLDB_USE_ENTITLEMENTS_Default})
 
-if ("${LLDB_CODESIGN_IDENTITY}" STREQUAL "")
+if (SKIP_DEBUGSERVER)
   if (CMAKE_HOST_APPLE)
     # If we haven't built a signed debugserver, copy the one from the system.
     add_custom_target(debugserver