[Trilinos-Users] PyTrilinos does not build with Clang on Mac OS X Mountain Lion

[Jonathan Guyer]

My Mac OS X laptop was recently forcibly upgraded from 10.6.8 to 10.8.4 and I've spent the intervening weeks trying to get things working again. I offer a solution below for the problems I ran into with PyTrilinos.

In the past, what I settled on is described at 

  http://matforge.org/fipy/wiki/InstallFiPy/MacOSX/SnowLeopard#Trilinos10.6.4

but this process failed to link due to missing symbols from the Python library (I tried unsuccessfully with Trilinos 10.6.4, 11.0.3, and 11.2.3). Make output here:

  https://gist.github.com/guyer/5796578

Careful comparison of the link command against what was generated by my last good build determined that "-undefined dynamic_lookup" was missing.

I find that this patch on 11.2.3 is enough to get things to link and pass FiPy's tests (I patched the same construct in Sundance, too, although I haven't tested that):

{{{
diff -u -r a/packages/PyTrilinos/src/CMakeLists.txt b/packages/PyTrilinos/src/CMakeLists.txt
--- a/packages/PyTrilinos/src/CMakeLists.txt	2013-04-25 13:15:58.000000000 -0400
+++ b/packages/PyTrilinos/src/CMakeLists.txt	2013-06-16 08:18:49.000000000 -0400
@@ -62,7 +62,7 @@
 # to the pytrilinos library and PyTrilinos extension modules
 SET(EXTRA_LINK_ARGS "${CMAKE_SHARED_LINKER_FLAGS}")
 IF(APPLE)
-  IF(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+  IF((CMAKE_CXX_COMPILER_ID MATCHES "GNU") OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang"))
     SET(EXTRA_LINK_ARGS "${EXTRA_LINK_ARGS} -undefined dynamic_lookup")
   ENDIF()
 ENDIF(APPLE)
diff -u -r a/packages/Sundance/python/src/CMakeLists.txt b/packages/Sundance/python/src/CMakeLists.txt
--- a/packages/Sundance/python/src/CMakeLists.txt	2013-04-25 13:16:10.000000000 -0400
+++ b/packages/Sundance/python/src/CMakeLists.txt	2013-06-16 08:59:04.000000000 -0400
@@ -4,7 +4,7 @@
 # to the pytrilinos library and PyTrilinos extension modules
 SET(EXTRA_LINK_ARGS "")
 IF(APPLE)
-  IF(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+  IF((CMAKE_CXX_COMPILER_ID MATCHES "GNU") OR (CMAKE_CXX_COMPILER_ID MATCHES "Clang"))
     APPEND_SET(EXTRA_LINK_ARGS "-undefined dynamic_lookup")
   ENDIF()
 ENDIF(APPLE)
}}}