closes https://github.com/assimp/assimp/issues/97: define for 32-bit linux

CMakeLists.txt

@@ -154,6 +154,13 @@ IF( CMAKE_COMPILER_IS_MINGW )
   ADD_DEFINITIONS(-DASSIMP_BUILD_NO_IFC_IMPORTER )
 ENDIF()
 
+# Ensure that we do not run into issues like http://www.tcm.phy.cam.ac.uk/sw/inodes64.html on 32 bit linux
+IF( UNIX )
+  IF (BUILD_SHARED_LIBS AND CMAKE_SIZEOF_VOID_P EQUAL 4) # only necessary for 32-bit linux
+    ADD_DEFINITIONS(-D_FILE_OFFSET_BITS=64 )
+  ENDIF()
+ENDIF()
+
 IF((CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX) AND NOT CMAKE_COMPILER_IS_MINGW)
   IF (BUILD_SHARED_LIBS AND CMAKE_SIZEOF_VOID_P EQUAL 8) # -fPIC is only required for shared libs on 64 bit
      SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")