Adding New Symbols

Any compatible new release of a shared object that contains new global symbols should assign these symbols to a new version definition. This new version definition should inherit the previous version definition.

The following mapfile example assigns the new symbol foo3 to the new interface version definition SUNW_1.2. This new interface inherits the original interface SUNW_1.1:

$ cat mapfile
SUNW_1.2 {                   # Release X+1.
        global:
                foo3;
} SUNW_1.1;

SUNW_1.1 {                   # Release X.
        global:
                foo2;
                foo1;
        local:
                *;
};

The inheritance of version definitions reduces the amount of version information that must be recorded in any user of the shared object.