From c8cc8ab1c86aecc66368be6b6e86e21be822a784 Mon Sep 17 00:00:00 2001
From: Thomas Krijnen <t.krijnen@gmail.com>
Date: Thu, 9 Mar 2017 13:59:54 +0100
Subject: [PATCH] Resolve python library linking issues on OSX

---
 src/ifcwrap/CMakeLists.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/ifcwrap/CMakeLists.txt b/src/ifcwrap/CMakeLists.txt
index 4dea70ff1a..5cb3a6259a 100644
--- a/src/ifcwrap/CMakeLists.txt
+++ b/src/ifcwrap/CMakeLists.txt
@@ -52,8 +52,14 @@ ENDIF()
 
 SET_SOURCE_FILES_PROPERTIES(IfcPython.i PROPERTIES CPLUSPLUS ON)
 SWIG_ADD_MODULE(ifcopenshell_wrapper python IfcPython.i)
+if("$ENV{LDFLAGS}" MATCHES ".undefined.suppress")
+# On osx there is some state in the python dylib. With `-Wl,undefined,suppress` we can ignore the missing symbols at compile time.
+SWIG_LINK_LIBRARIES(ifcopenshell_wrapper ${IFCOPENSHELL_LIBRARIES} ${OPENCASCADE_LIBRARIES}
+    ${ICU_LIBRARIES} ${Boost_LIBRARIES})
+else()
 SWIG_LINK_LIBRARIES(ifcopenshell_wrapper ${IFCOPENSHELL_LIBRARIES} ${PYTHON_LIBRARIES} ${OPENCASCADE_LIBRARIES}
     ${ICU_LIBRARIES} ${Boost_LIBRARIES})
+endif()
 if ((NOT WIN32) AND BUILD_SHARED_LIBS)
     SET_INSTALL_RPATHS(${SWIG_MODULE_ifcopenshell_wrapper_REAL_NAME} "${IFCDIRS};${OCC_LIBRARY_DIR};${ICU_LIBRARY_DIR}")
 endif()