From 6b208c034078c0e222c95abaa7f5c9e76fa761ea Mon Sep 17 00:00:00 2001
From: Duy-Nguyen Ta <dta-huynh@irobot.com>
Date: Wed, 16 Aug 2017 22:13:38 -0400
Subject: [PATCH] fix eigency build for Linux. Only Mac OS's linker needs the
 dynamic_lookup option for undefined symbols

---
 CMakeCache.txt               | 38 ++++++++++++++++++++++++++++++++++++
 CMakeFiles/cmake.check_cache |  1 +
 cmake/GtsamCythonWrap.cmake  |  5 ++++-
 3 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 CMakeCache.txt
 create mode 100644 CMakeFiles/cmake.check_cache

diff --git a/CMakeCache.txt b/CMakeCache.txt
new file mode 100644
index 000000000..2703b894c
--- /dev/null
+++ b/CMakeCache.txt
@@ -0,0 +1,38 @@
+# This is the CMakeCache file.
+# For build in directory: /home/dta-huynh/git/gtsam
+# It was generated by CMake: /usr/bin/cmake
+# You can edit this file to change values found and used by cmake.
+# If you do not want to change any of the values, simply exit the editor.
+# If you do want to change a value, simply edit, save, and exit the editor.
+# The syntax for the file is as follows:
+# KEY:TYPE=VALUE
+# KEY is the name of a variable in the cache.
+# TYPE is a hint to GUIs for the type of VALUE, DO NOT EDIT TYPE!.
+# VALUE is the current value for the KEY.
+
+########################
+# EXTERNAL cache entries
+########################
+
+
+########################
+# INTERNAL cache entries
+########################
+
+//This is the directory where this CMakeCache.txt was created
+CMAKE_CACHEFILE_DIR:INTERNAL=/home/dta-huynh/git/gtsam
+//Major version of cmake used to create the current loaded cache
+CMAKE_CACHE_MAJOR_VERSION:INTERNAL=3
+//Minor version of cmake used to create the current loaded cache
+CMAKE_CACHE_MINOR_VERSION:INTERNAL=5
+//Patch version of cmake used to create the current loaded cache
+CMAKE_CACHE_PATCH_VERSION:INTERNAL=1
+//Path to CMake executable.
+CMAKE_COMMAND:INTERNAL=/usr/bin/cmake
+//Path to cpack program executable.
+CMAKE_CPACK_COMMAND:INTERNAL=/usr/bin/cpack
+//Path to ctest program executable.
+CMAKE_CTEST_COMMAND:INTERNAL=/usr/bin/ctest
+//Path to CMake installation.
+CMAKE_ROOT:INTERNAL=/usr/share/cmake-3.5
+
diff --git a/CMakeFiles/cmake.check_cache b/CMakeFiles/cmake.check_cache
new file mode 100644
index 000000000..3dccd7317
--- /dev/null
+++ b/CMakeFiles/cmake.check_cache
@@ -0,0 +1 @@
+# This file is generated by cmake for dependency checking of the CMakeCache.txt file
diff --git a/cmake/GtsamCythonWrap.cmake b/cmake/GtsamCythonWrap.cmake
index 0885fb1d4..d4bff5537 100644
--- a/cmake/GtsamCythonWrap.cmake
+++ b/cmake/GtsamCythonWrap.cmake
@@ -68,7 +68,10 @@ endfunction()
 #    - output_dir:   The output directory
 function(build_cythonized_cpp target cpp_file output_lib_we output_dir)
   add_library(${target} MODULE ${cpp_file})
-  set_target_properties(${target} PROPERTIES COMPILE_FLAGS "-w" LINK_FLAGS "-undefined dynamic_lookup"
+  if(APPLE)
+    set(link_flags "-undefined dynamic_lookup")
+  endif()
+  set_target_properties(${target} PROPERTIES COMPILE_FLAGS "-w" LINK_FLAGS "${link_flags}"
     OUTPUT_NAME ${output_lib_we} PREFIX "" LIBRARY_OUTPUT_DIRECTORY ${output_dir})
 endfunction()