Merge pull request #2733 from gangliao/include_eign3

FIX: Add eigen and any as INTERFACE deps

cmake/external/any.cmake

@@ -2,10 +2,10 @@ INCLUDE(ExternalProject)
 
 SET(ANY_SOURCE_DIR ${THIRD_PARTY_PATH}/any)
 
-INCLUDE_DIRECTORIES(${ANY_SOURCE_DIR}/src/linb_any)
+INCLUDE_DIRECTORIES(${ANY_SOURCE_DIR}/src/extern_lib_any)
 
 ExternalProject_Add(
-    linb_any
+    extern_lib_any
     ${EXTERNAL_PROJECT_LOG_ARGS}
     GIT_REPOSITORY  "https://github.com/thelink2012/any.git"
     GIT_TAG         "8fef1e93710a0edf8d7658999e284a1142c4c020"
@@ -17,5 +17,15 @@ ExternalProject_Add(
     TEST_COMMAND      ""
 )
 
+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 linb_any)
+LIST(APPEND external_project_dependencies lib_any)
\ No newline at end of file

cmake/external/eigen.cmake

@@ -2,10 +2,10 @@ INCLUDE(ExternalProject)
 
 SET(EIGEN_SOURCE_DIR ${THIRD_PARTY_PATH}/eigen3)
 
-INCLUDE_DIRECTORIES(${EIGEN_SOURCE_DIR}/src/eigen3)
+INCLUDE_DIRECTORIES(${EIGEN_SOURCE_DIR}/src/extern_eigen3)
 
 ExternalProject_Add(
-    eigen3
+    extern_eigen3
     ${EXTERNAL_PROJECT_LOG_ARGS}
     # for latest version, please get from official website
     # URL            "https://bitbucket.org/eigen/eigen/get/3.3.4.tar.gz"
@@ -26,4 +26,14 @@ ExternalProject_Add(
     TEST_COMMAND      ""
 )
 
+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()
+
+add_dependencies(eigen3 extern_eigen3)
+
 LIST(APPEND external_project_dependencies eigen3)