[LLDB] Fixes for standalone build

[Eugene.Zelenko]

Summary

This patch include two fixes:

• include CheckAtomic to set HAVE_CXX_ATOMICS64_WITHOUT_LIB properly (introduced in r274121)
• hint Clang CMake files for LLVM CMake files location (inctroduced in ~ r274176)

[labath]

lgtm.

cmake/modules/LLDBStandalone.cmake

61 ↗

(On Diff #63878)

Please put a more descriptive location here, as this is the same as LLVM_BINARY_DIR. Perhaps "Path to LLVMConfig.cmake" if you can't think of anything better.

[nitesh.jain]

LGTM. Thanks

[Eugene.Zelenko]

Improved description, but in generic terms, since two files are needed.

lldb/trunk/cmake/modules/LLDBStandalone.cmake

set(LLVM_ENABLE_ASSERTIONS ${ENABLE_ASSERTIONS}
       CACHE BOOL "Enable assertions")
     # Assertions should follow llvm-config's.
     mark_as_advanced(LLVM_ENABLE_ASSERTIONS)
   endif()
 
   set(LLVM_TOOLS_BINARY_DIR ${TOOLS_BINARY_DIR} CACHE PATH "Path to llvm/bin")
   set(LLVM_LIBRARY_DIR ${LIBRARY_DIR} CACHE PATH "Path to llvm/lib")
   set(LLVM_MAIN_INCLUDE_DIR ${INCLUDE_DIR} CACHE PATH "Path to llvm/include")
+  set(LLVM_DIR ${LLVM_OBJ_ROOT}/cmake/modules/CMakeFiles CACHE PATH "Path to LLVM build tree CMake files")
   set(LLVM_BINARY_DIR ${LLVM_OBJ_ROOT} CACHE PATH "Path to LLVM build tree")
   set(LLVM_MAIN_SRC_DIR ${MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
 
   find_program(LLVM_TABLEGEN_EXE "llvm-tblgen" ${LLVM_TOOLS_BINARY_DIR}
     NO_DEFAULT_PATH)
 
   set(LLVM_CMAKE_PATH "${LLVM_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm")
   set(LLVMCONFIG_FILE "${LLVM_CMAKE_PATH}/LLVMConfig.cmake")
if(WIN32 OR CYGWIN)
     # DLL platform -- put DLLs into bin.
     set(LLVM_SHLIB_OUTPUT_INTDIR ${LLVM_RUNTIME_OUTPUT_INTDIR})
   else()
     set(LLVM_SHLIB_OUTPUT_INTDIR ${LLVM_LIBRARY_OUTPUT_INTDIR})
   endif()
 
   include(AddLLVM)
   include(HandleLLVMOptions)
+  include(CheckAtomic)
 
   if (PYTHON_EXECUTABLE STREQUAL "")
     set(Python_ADDITIONAL_VERSIONS 3.5 3.4 3.3 3.2 3.1 3.0 2.7 2.6 2.5)
     include(FindPythonInterp)
     if( NOT PYTHONINTERP_FOUND )
       message(FATAL_ERROR
               "Unable to find Python interpreter, required for builds and testing.
                Please install Python or specify the PYTHON_EXECUTABLE CMake variable.")