Add Google NSync CMake package (#4161)

* Add Google NSync CMake package

This commit adds Google NSync CMake package.

Signed-off-by: Jonghyun Park <jh1302.park@samsung.com>
* Remove duplicated set

diff --git a/cmake/packages/GoogleNSyncConfig.cmake b/cmake/packages/GoogleNSyncConfig.cmake
new file mode 100644 (file)
index 0000000..1fdf8cc
--- /dev/null
+++ b/cmake/packages/GoogleNSyncConfig.cmake
@@ -0,0 +1,62 @@
+# https://github.com/google/nsync
+set(GOOGLE_NSYNC_PREFIX "/usr" CACHE PATH "Where to find Google NSync library")
+
+function(_GoogleNSync_import)
+  # Find the header & lib
+  find_library(GoogleNSync_C_LIB
+    NAMES nsync
+    PATHS "${GOOGLE_NSYNC_PREFIX}/lib"
+  )
+
+  find_library(GoogleNSync_CPP_LIB
+    NAMES nsync_cpp
+    PATHS "${GOOGLE_NSYNC_PREFIX}/lib"
+  )
+
+  find_path(GoogleNSync_INCLUDE_DIR
+    NAMES nsync.h
+    PATHS "${GOOGLE_NSYNC_PREFIX}/include"
+  )
+
+  message(STATUS "GoogleNSync_C_LIB: ${GoogleNSync_C_LIB}")
+  message(STATUS "GoogleNSync_CPP_LIB: ${GoogleNSync_CPP_LIB}")
+  message(STATUS "GoogleNSync_INCLUDE_DIR: ${GoogleNSync_INCLUDE_DIR}")
+
+  set(GoogleNSync_FOUND TRUE)
+
+  if(NOT GoogleNSync_C_LIB)
+    set(GoogleNSync_FOUND FALSE)
+  endif(NOT GoogleNSync_C_LIB)
+
+  if(NOT GoogleNSync_CPP_LIB)
+    set(GoogleNSync_FOUND FALSE)
+  endif(NOT GoogleNSync_CPP_LIB)
+
+  if(NOT GoogleNSync_INCLUDE_DIR)
+    set(GoogleNSync_FOUND FALSE)
+  endif(NOT GoogleNSync_INCLUDE_DIR)
+
+  unset(MESSAGE)
+  list(APPEND MESSAGE "Found Google NSync")
+
+  if(NOT GoogleNSync_FOUND)
+    list(APPEND MESSAGE ": FALSE")
+  else(NOT GoogleNSync_FOUND)
+    list(APPEND MESSAGE " (include: ${GoogleNSync_INCLUDE_DIR} library: ${GoogleNSync_C_LIB} ${GoogleNSync_CPP_LIB})")
+
+    # Add target
+    if(NOT TARGET google_nsync)
+      # NOTE IMPORTED target may be more appropriate for this case
+      add_library(google_nsync INTERFACE)
+      target_link_libraries(google_nsync INTERFACE ${GoogleNSync_C_LIB} ${GoogleNSync_CPP_LIB})
+      target_include_directories(google_nsync INTERFACE ${GoogleNSync_INCLUDE_DIR})
+
+      add_library(Google::NSync ALIAS google_nsync)
+    endif(NOT TARGET google_nsync)
+  endif(NOT GoogleNSync_FOUND)
+
+  message(STATUS ${MESSAGE})
+  set(GoogleNSync_FOUND ${GoogleNSync_FOUND} PARENT_SCOPE)
+endfunction(_GoogleNSync_import)
+
+_GoogleNSync_import()