Introduction and Motivating Example
Two versions of the same library might be API-Compatible (you can recompile your code), but they are not ABI-compatible (you cannot just swap the binary .so without recompiling). Here’s a motivating example:
We have two versions of the same data schema, and some fields are swapped. In serialization / deserialization, it’s common to make assumptions about the order of fields. So such a order change would likeliy not cause compilation issue, but will cause data interpretation issue.
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// Version 1:
struct DataPacket{
int value1;
int value2;
};
// Version 2:
struct DataPacket{
int value2;
int value1;
};
