[PATCH] D31619: [CMake][libcxx] Link libc when checking for atomics support

[Petr Hosek via Phabricator via llvm-commits]

phosek created this revision.
Herald added a subscriber: mgorny.

The C library is needed when linking the atomics test executable.


Repository:
  rL LLVM

https://reviews.llvm.org/D31619

Files:
  cmake/Modules/CheckLibcxxAtomic.cmake


Index: cmake/Modules/CheckLibcxxAtomic.cmake
===================================================================
--- cmake/Modules/CheckLibcxxAtomic.cmake
+++ cmake/Modules/CheckLibcxxAtomic.cmake
@@ -9,7 +9,7 @@
 
 function(check_cxx_atomics varname)
   set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
-  set(CMAKE_REQUIRED_FLAGS "-nodefaultlibs -std=c++11 -nostdinc++ -isystem ${LIBCXX_SOURCE_DIR}/include")
+  set(CMAKE_REQUIRED_FLAGS "-nodefaultlibs -std=c++11 -nostdinc++ -isystem ${LIBCXX_SOURCE_DIR}/include -lc")
   if (${LIBCXX_GCC_TOOLCHAIN})
     set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} --gcc-toolchain=${LIBCXX_GCC_TOOLCHAIN}")
   endif()


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