From a211374d53090733667f2be2cf629cf858757c6d Mon Sep 17 00:00:00 2001
From: liaogang <liaogang@baidu.com>
Date: Tue, 4 Jul 2017 15:01:05 +0800
Subject: [PATCH] FIX: interface deps under cmake < 3.3

---
 cmake/external/any.cmake   | 13 ++++++++++---
 cmake/external/eigen.cmake | 13 ++++++++++---
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/cmake/external/any.cmake b/cmake/external/any.cmake
index b61e421871..edf6edc0bd 100644
--- a/cmake/external/any.cmake
+++ b/cmake/external/any.cmake
@@ -17,8 +17,15 @@ ExternalProject_Add(
     TEST_COMMAND      ""
 )
 
-ADD_LIBRARY(lib_any INTERFACE)
-ADD_DEPENDENCIES(lib_any extern_lib_any)
+if (${CMAKE_VERSION} VERSION_LESS "3.3.0")
+    set(dummyfile ${CMAKE_CURRENT_BINARY_DIR}/lib_any_dummy.c)
+    file(WRITE ${dummyfile} "const char * dummy_any = \"${dummyfile}\";")
+    add_library(lib_any STATIC ${dummyfile})
+else()
+    add_library(lib_any INTERFACE)
+endif()
+
+add_dependencies(lib_any extern_lib_any)
 
 add_definitions(-DANY_IMPL_ANY_CAST_MOVEABLE)
-LIST(APPEND external_project_dependencies extern_lib_any)
+LIST(APPEND external_project_dependencies lib_any)
diff --git a/cmake/external/eigen.cmake b/cmake/external/eigen.cmake
index 39b16c3b2b..1f2fdcac65 100644
--- a/cmake/external/eigen.cmake
+++ b/cmake/external/eigen.cmake
@@ -26,7 +26,14 @@ ExternalProject_Add(
     TEST_COMMAND      ""
 )
 
-ADD_LIBRARY(eigen3 INTERFACE)
-ADD_DEPENDENCIES(eigen3 extern_eigen3)
+if (${CMAKE_VERSION} VERSION_LESS "3.3.0")
+    set(dummyfile ${CMAKE_CURRENT_BINARY_DIR}/eigen3_dummy.c)
+    file(WRITE ${dummyfile} "const char * dummy_eigen3 = \"${dummyfile}\";")
+    add_library(eigen3 STATIC ${dummyfile})
+else()
+    add_library(eigen3 INTERFACE)
+endif()
 
-LIST(APPEND external_project_dependencies extern_eigen3)
+add_dependencies(eigen3 extern_eigen3)
+
+LIST(APPEND external_project_dependencies eigen3)
-- 
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