Do not use JIT compilation in 32 bit mode, since AsmJit currently doesn't support that properly

CMakeLists.txt

@@ -270,12 +270,14 @@ ELSE (ANDROID OR PNACL)
     SET_SOURCE_FILES_PROPERTIES(${CMAKE_SOURCE_DIR}/libraries/sfmt/src/SFMT.cpp PROPERTIES COMPILE_FLAGS "-DHAVE_SSE2=1")
 ENDIF(ANDROID OR PNACL)
 IF (NOT (ANDROID OR PNACL))
-    FILE(GLOB src_files ${CMAKE_CURRENT_SOURCE_DIR}/libraries/asmjit/*/*.cpp)
-    FILE(GLOB incl_files ${CMAKE_CURRENT_SOURCE_DIR}/libraries/asmjit/*.h)
-    SET(SOURCE_FILES ${SOURCE_FILES} ${src_files})
-    SET(SOURCE_INCLUDE_FILES ${SOURCE_INCLUDE_FILES} ${incl_files})
-    INCLUDE_DIRECTORIES(BEFORE "${CMAKE_CURRENT_SOURCE_DIR}/libraries/asmjit")
-    SET(EXTRA_COMPILE_FLAGS "${EXTRA_COMPILE_FLAGS} -DLEPTON_USE_JIT")
+    IF (CMAKE_SIZEOF_VOID_P EQUAL 8)
+        FILE(GLOB src_files ${CMAKE_CURRENT_SOURCE_DIR}/libraries/asmjit/*/*.cpp)
+        FILE(GLOB incl_files ${CMAKE_CURRENT_SOURCE_DIR}/libraries/asmjit/*.h)
+        SET(SOURCE_FILES ${SOURCE_FILES} ${src_files})
+        SET(SOURCE_INCLUDE_FILES ${SOURCE_INCLUDE_FILES} ${incl_files})
+        INCLUDE_DIRECTORIES(BEFORE "${CMAKE_CURRENT_SOURCE_DIR}/libraries/asmjit")
+        SET(EXTRA_COMPILE_FLAGS "${EXTRA_COMPILE_FLAGS} -DLEPTON_USE_JIT")
+    ENDIF (CMAKE_SIZEOF_VOID_P EQUAL 8)
 ENDIF (NOT (ANDROID OR PNACL))
 
 # If API wrappers are being generated, and add them to the build.
@@ -292,7 +294,7 @@ SET(OPENMM_BUILD_SHARED_LIB ON CACHE BOOL "Whether to build shared OpenMM librar
 
 SET(EXTRA_LINK_FLAGS ${EXTRA_COMPILE_FLAGS})
 IF (CMAKE_SYSTEM_NAME MATCHES "Linux")
-    SET(EXTRA_LINK_FLAGS "${EXTRA_LINK_FLAGS} -lrt")
+    SET(EXTRA_LINK_FLAGS "${EXTRA_LINK_FLAGS} -Wl,--no-as-needed -lrt")
 ENDIF (CMAKE_SYSTEM_NAME MATCHES "Linux")
 
 IF(OPENMM_BUILD_SHARED_LIB)