[PATCH] D56061: [clang-tools-extra] [clangd] Fix detecting atomics in stand-alone builds

[Michał Górny via Phabricator via cfe-commits]

mgorny created this revision.
mgorny added reviewers: bkramer, sdardis, sammccall, ilya-biryukov.
Herald added subscribers: kadircet, jfb, arphaman, jkorous, MaskRay, ioeric.

Include CheckAtomic CMake module from LLVM in order to detect support
for atomics when building stand-alone.  Otherwise,
the HAVE_CXX_ATOMICS64_WITHOUT_LIB variable is undefined and clangd
wrongly attempts to link -latomic on systems not using the library.

Original bug report: https://bugs.gentoo.org/667016


Repository:
  rCTE Clang Tools Extra

https://reviews.llvm.org/D56061

Files:
  clangd/CMakeLists.txt


Index: clangd/CMakeLists.txt
===================================================================
--- clangd/CMakeLists.txt
+++ clangd/CMakeLists.txt
@@ -2,6 +2,11 @@
   Support
   )
 
+if(CLANG_BUILT_STANDALONE)
+  # needed to get HAVE_CXX_ATOMICS64_WITHOUT_LIB defined
+  include(CheckAtomic)
+endif()
+
 set(CLANGD_ATOMIC_LIB "")
 if(NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB)
   list(APPEND CLANGD_ATOMIC_LIB "atomic")


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