Are there any tools that can compare two source files

Hi,
I am looking for some tool which is more than simple text diff. I am
looking for a tool which can generate the structure trees for the
source file and compare them. It should not throw errors if the
structure is just re-arragned.


i.e,
Assuming A, B are independent,


struct A
{..}
union B
{..}


is functionally similar to


Union B
{..}
Struct A
{..}


Also, the tool should be intelligent enough to handle rearranged
structure members.


Struct A
{
    int a,
    int b
};


is same as


Struct A
{
    int b,
    int a
}


Are there any open source code-generators that can generate C++ code
using the structure trees generated by copilers like gcc ?


Thanks in advance.
Satya

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