[lldb][cmake] Set CMAKE_OSX_SYSROOT when building debugserver with CMake 4 (#138020)

CMake 4 no longer sets the `CMAKE_OSX_SYSROOT` variable by default. If
you've updated to CMake 4 on macOS (e.g. with brew) and try building
LLDB with CMake/ninja, this will yield an error when building
debugserver that clang is unable to run since it tries to compile files
that don't exist.

These files are supposed to be generated by the `mig` process. `mig`
needs the `CMAKE_OSX_SYSROOT` variable in order to work and without it,
it silently fails to generate the files that later on need to be
compiled.

This commit sets this SDK path for mig and will fatal error out of config
when building debugserver without having set CMAKE_OSX_SYSROOT.

Author: chelcassanova

lldb/tools/debugserver/source/CMakeLists.txt

@@ -154,6 +154,21 @@ endif()
 
 add_definitions(-DLLDB_USE_OS_LOG)
 
+# Make sure we have the macOS SDK root as mig needs it and will silently
+# fail to generate its output files without it.
+if(CMAKE_OSX_SYSROOT)
+  set(MIG_SYSROOT ${CMAKE_OSX_SYSROOT})
+else()
+  execute_process(COMMAND xcrun --show-sdk-path
+    OUTPUT_VARIABLE MIG_SYSROOT
+    ERROR_QUIET
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+endif()
+
+if(NOT MIG_SYSROOT)
+  message(FATAL_ERROR "Unable to obtain sysroot required by mig (Mach Interface Generator). Set CMAKE_OSX_SYSROOT to explicitly specify a sysroot.")
+endif()
+
 if(${CMAKE_OSX_SYSROOT} MATCHES ".Internal.sdk$")
   message(STATUS "LLDB debugserver energy support is enabled")
   add_definitions(-DLLDB_ENERGY)
@@ -177,7 +192,7 @@ endif()
 separate_arguments(MIG_ARCH_FLAGS_SEPARTED NATIVE_COMMAND "${MIG_ARCH_FLAGS}")
 
 add_custom_command(OUTPUT ${generated_mach_interfaces}
-  VERBATIM COMMAND mig ${MIG_ARCH_FLAGS_SEPARTED} -isysroot ${CMAKE_OSX_SYSROOT} ${CMAKE_CURRENT_SOURCE_DIR}/MacOSX/dbgnub-mig.defs
+  VERBATIM COMMAND mig ${MIG_ARCH_FLAGS_SEPARTED} -isysroot ${MIG_SYSROOT} ${CMAKE_CURRENT_SOURCE_DIR}/MacOSX/dbgnub-mig.defs
   DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/MacOSX/dbgnub-mig.defs
   )