[ann-ref] Check required targets (#3923)

Now, ann-ref build gets stuck with error message if required targets are
missing.

Signed-off-by: Jonghyun Park <jh1302.park@samsung.com>

diff --git a/contrib/ann-ref/CMakeLists.txt b/contrib/ann-ref/CMakeLists.txt
index 5558f12..d18a3c7 100644 (file)
--- a/contrib/ann-ref/CMakeLists.txt
+++ b/contrib/ann-ref/CMakeLists.txt
@@ -10,6 +10,10 @@ if(NOT GEMMLowp_FOUND)
   return()
 endif(NOT GEMMLowp_FOUND)
 
+nncc_include(TargetRequire)
+
+TargetRequire_Assert(ann_api eigen gemmlowp)
+
 file(GLOB_RECURSE SOURCES "src/*.cpp")
 
 function(ann_ref_configure TARGET)