Add eigen3 library (#53)

This commit addes eigen3 as a CMake target, which allows us to easily
use eigen3 in our internal implementation.

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

diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index 63d6bb9..210ffe6 100644 (file)
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -15,6 +15,16 @@
 set(TENSORFLOW_BASE ${CMAKE_CURRENT_SOURCE_DIR}/tensorflow)
 set(TENSORFLOW_LITE_BASE ${TENSORFLOW_BASE}/tensorflow/contrib/lite)
 
+# Eigen 3
+file(GLOB_RECURSE EIGEN3_HDRS "${CMAKE_CURRENT_SOURCE_DIR}/eigen/*.h")
+
+# NOTE From 3.x, CMake supports INTERFACE library feature. Unfortunately,
+#      CMake 2.8.12 (which Ubuntu 14.04 provides) does not support this
+#      library feature.
+add_library(eigen3 STATIC ${EIGEN3_HDRS})
+set_target_properties(eigen3 PROPERTIES LINKER_LANGUAGE CXX)
+target_include_directories(eigen3 PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/eigen")
+
 #
 # Protocol Buffer (>= 3.5.1)
 #
@@ -68,7 +78,6 @@ list(APPEND TFLITE_SRCS "farmhash/src/farmhash.cc")
 
 list(APPEND TFLITE_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/")
 list(APPEND TFLITE_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/tensorflow")
-list(APPEND TFLITE_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/eigen")
 list(APPEND TFLITE_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/gemmlowp")
 list(APPEND TFLITE_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/neon_2_sse")
 list(APPEND TFLITE_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/farmhash/src")
@@ -77,6 +86,6 @@ list(APPEND TFLITE_INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/flatbuffers/include")
 add_library(tensorflow_lite ${TFLITE_SRCS})
 target_include_directories(tensorflow_lite PUBLIC ${TFLITE_INCLUDES})
 target_compile_definitions(tensorflow_lite PUBLIC "GEMMLOWP_ALLOW_SLOW_SCALAR_FALLBACK")
-target_link_libraries(tensorflow_lite pthread dl)
+target_link_libraries(tensorflow_lite eigen3 pthread dl)
 
 install(TARGETS tensorflow_lite ARCHIVE DESTINATION lib)