[llvm] r319610 - CMAKE: help CheckAtomic find check_library_exists

[Martell Malone via llvm-commits]

Author: martell
Date: Fri Dec  1 23:17:01 2017
New Revision: 319610

URL: http://llvm.org/viewvc/llvm-project?rev=319610&view=rev
Log:
CMAKE: help CheckAtomic find check_library_exists

lldb fails to build standalone on x86

-- Performing Test HAVE_CXX_ATOMICS64_WITHOUT_LIB - Failed
CMake Error at CheckAtomic.cmake:66 (check_library_exists):
  Unknown CMake command "check_library_exists".
Call Stack (most recent call first):
  LLDBStandalone.cmake:90 (include)
CMakeLists.txt:3 (include)

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D40220

Modified:
    llvm/trunk/cmake/modules/CheckAtomic.cmake

Modified: llvm/trunk/cmake/modules/CheckAtomic.cmake
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/cmake/modules/CheckAtomic.cmake?rev=319610&r1=319609&r2=319610&view=diff
==============================================================================
--- llvm/trunk/cmake/modules/CheckAtomic.cmake (original)
+++ llvm/trunk/cmake/modules/CheckAtomic.cmake Fri Dec  1 23:17:01 2017
@@ -1,6 +1,7 @@
 # atomic builtins are required for threading support.
 
 INCLUDE(CheckCXXSourceCompiles)
+INCLUDE(CheckLibraryExists)
 
 # Sometimes linking against libatomic is required for atomic ops, if
 # the platform doesn't support lock-free atomics.