[cmake] Add option to skip building lldb-server

Summary:
There is currently a way to skip the debugserver build. See how the CMake
variables SKIP_DEBUGSERVER and LLDB_CODESIGN_IDENTITY are used if you're
interested in that.

This allows us to skip building lldb-server as well. There is another
debug server called ds2 that can be used with LLDB. If you choose to use
ds2, this flag is very useful because it can cut down the build time of LLDB.

Differential Revision: https://reviews.llvm.org/D49282

llvm-svn: 340560

lldb/cmake/modules/LLDBConfig.cmake

@@ -357,6 +357,8 @@ endif()
 
 list(APPEND system_libs ${CMAKE_DL_LIBS})
 
+SET(SKIP_LLDB_SERVER_BUILD OFF CACHE BOOL "Skip building lldb-server")
+
 # Figure out if lldb could use lldb-server.  If so, then we'll
 # ensure we build lldb-server when an lldb target is being built.
 if (CMAKE_SYSTEM_NAME MATCHES "Android|Darwin|FreeBSD|Linux|NetBSD")

lldb/tools/CMakeLists.txt

@@ -6,7 +6,7 @@ add_subdirectory(argdumper)
 add_subdirectory(driver)
 add_subdirectory(lldb-mi)
 add_subdirectory(lldb-vscode)
-if (LLDB_CAN_USE_LLDB_SERVER)
+if (LLDB_CAN_USE_LLDB_SERVER AND NOT SKIP_LLDB_SERVER_BUILD)
   add_subdirectory(lldb-server)
 endif()
 add_subdirectory(intel-features)

lldb/unittests/tools/CMakeLists.txt

@@ -1,5 +1,5 @@
 if(CMAKE_SYSTEM_NAME MATCHES "Android|Darwin|Linux|NetBSD")
-  if (CMAKE_SYSTEM_NAME MATCHES "Darwin" AND SKIP_DEBUGSERVER)
+  if ((CMAKE_SYSTEM_NAME MATCHES "Darwin" AND SKIP_DEBUGSERVER) OR (NOT CMAKE_SYSTEM_NAME MATCHES "Darwin" AND SKIP_LLDB_SERVER_BUILD))
     # 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()