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C4.5 on linux x86_64

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C4.5 on linux x86_64

Postby Tobu » Mon Jan 05, 2009 23:27

Here are two unrelated fixes for C4.5.

The first is required for building on x86_64; gcc needs the -fPIC flag.

The second is required for dlopen on a recent linux. dlopen needs the RTLD_LAZY flag.

Code: Select all
diff --git a/orange/ b/orange/
index b30b73b..dbee415 100644
--- a/orange/
+++ b/orange/
@@ -69,7 +69,7 @@ if sys.platform == "win32":
 elif sys.platform == "linux2":
-    ret = os.system('gcc ensemble.c -o %s/ -shared -lstdc++' % orangedir)
+    ret = os.system('gcc -fPIC ensemble.c -o %s/ -shared -lstdc++' % oran
     if ret:
         print "compiler/linker exited abnormally"
diff --git a/source/orange/c4.5.cpp b/source/orange/c4.5.cpp
index 0e05a75..e1b4fe3 100644
--- a/source/orange/c4.5.cpp
+++ b/source/orange/c4.5.cpp
@@ -126,7 +126,7 @@ void *getsym(void *handle, const char *name)
 void dynloadC45(char pathname[])
-  void *handle = dlopen(pathname, 0 /*dlopenflags*/);
+  void *handle = dlopen(pathname, RTLD_LAZY);
   if (handle == NULL)
     raiseErrorWho("C45Loader", dlerror());


Postby neuroman » Sun Jan 11, 2009 15:04

Thanks for this, I was just working on this issue myself. The second patch (c4.5.cpp) failed against the current SVN, but I edited the file manually to make the change.
This should be fixed in SVN for us 64 bit linux users.

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