CMake - introduce dependency on libatomic

Author: SiskaPavel

cmake/dependencies.cmake

@@ -1 +1,5 @@
 # Project dependencies
+find_package(PkgConfig REQUIRED)
+
+find_package(Threads REQUIRED)
+find_package(Atomic REQUIRED)

cmake/modules/FindAtomic.cmake

@@ -0,0 +1,29 @@
+# Try to find libatomic
+# Once done, this will define
+#
+# ATOMIC_FOUND        - system has libatomic
+# ATOMIC_LIBRARIES    - libraries needed to use libatomic
+#
+
+find_library(ATOMIC_LIBRARY
+  NAMES atomic libatomic.so.1 
+  HINTS ${ATOMIC_ROOT}
+     ${CMAKE_INSTALL_LIBDIR})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args (Atomic
+  REQUIRED_VARS ATOMIC_LIBRARY
+)
+
+if (ATOMIC_FOUND AND NOT TARGET atomic::atomic)
+  add_library(atomic::atomic STATIC IMPORTED)
+  set_target_properties(atomic::atomic PROPERTIES
+    IMPORTED_LOCATION "${ATOMIC_LIBRARY}"
+    INTERFACE_INCLUDE_DIRECTORIES "${ATOMIC_INCLUDE_DIR}")
+  target_compile_definitions(atomic::atomic INTERFACE UNWIND_FOUND)
+else()
+  message(CRITICAL "Notice: atomic not found")
+  add_library(atomic::atomic INTERFACE IMPORTED)
+endif()
+
+unset(ATOMIC_LIBRARY)