g++ 4.6 malloc pointer error

I have just compiled and installed gcc 4.6.0 on my Mac running OSX 10.6 . I have graphite enabled, so i compiled it like this:

../gcc-4.6.1/configure --with-ppl=/usr/ppl --with-cloog=/usr/cloog --prefix=/usr/local/ --enable-languages=c,c++

It build fine and even compiles, but even if I try to execute a program using some libraries like Boost and ROOT I get an error like this:

inten(12480) malloc: *** error for object 0x7fff70012500: pointer being f开发者_如何转开发reed was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap

It's most likely a bug in your code. For example, calling free twice will cause exactly this. Can you post the smallest piece of compilable code that produces this error?